ZYQAssetPickerController.m 35.8 KB
Newer Older
freecui's avatar
freecui committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074
//
//  ZYQAssetPickerController.m
//  ZYQAssetPickerControllerDemo
//
//  Created by Zhao Yiqi on 13-12-25.
//  Copyright (c) 2013年 heroims. All rights reserved.
//

#import "ZYQAssetPickerController.h"

#define IS_IOS7             ([[[UIDevice currentDevice] systemVersion] compare:@"7.0" options:NSNumericSearch] != NSOrderedAscending)
#define kThumbnailLength    78.0f
#define kThumbnailSize      CGSizeMake(kThumbnailLength, kThumbnailLength)
#define kPopoverContentSize CGSizeMake(320, 480)

#pragma mark -

@interface NSDate (TimeInterval)

+ (NSDateComponents *)componetsWithTimeInterval:(NSTimeInterval)timeInterval;
+ (NSString *)timeDescriptionOfTimeInterval:(NSTimeInterval)timeInterval;

@end

@implementation NSDate (TimeInterval)

+ (NSDateComponents *)componetsWithTimeInterval:(NSTimeInterval)timeInterval
{
    NSCalendar *calendar = [NSCalendar currentCalendar];
    
    NSDate *date1 = [[NSDate alloc] init];
    NSDate *date2 = [[NSDate alloc] initWithTimeInterval:timeInterval sinceDate:date1];
    
    unsigned int unitFlags =
    NSSecondCalendarUnit | NSMinuteCalendarUnit | NSHourCalendarUnit |
    NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit;
    
    return [calendar components:unitFlags
                       fromDate:date1
                         toDate:date2
                        options:0];
}

+ (NSString *)timeDescriptionOfTimeInterval:(NSTimeInterval)timeInterval
{
    NSDateComponents *components = [self.class componetsWithTimeInterval:timeInterval];
    NSInteger roundedSeconds = lround(timeInterval - (components.hour * 60) - (components.minute * 60 * 60));
    
    if (components.hour > 0)
    {
        return [NSString stringWithFormat:@"%ld:%02ld:%02ld", (long)components.hour, (long)components.minute, (long)roundedSeconds];
    }
    
    else
    {
        return [NSString stringWithFormat:@"%ld:%02ld", (long)components.minute, (long)roundedSeconds];
    }
}

@end

#pragma mark - ZYQAssetPickerController

@interface ZYQAssetPickerController ()

@property (nonatomic, copy) NSArray *indexPathsForSelectedItems;

@end

#pragma mark - ZYQVideoTitleView

@implementation ZYQVideoTitleView

-(void)drawRect:(CGRect)rect{
    CGFloat colors [] = {
        0.0, 0.0, 0.0, 0.0,
        0.0, 0.0, 0.0, 0.8,
        0.0, 0.0, 0.0, 1.0
    };
    
    CGFloat locations [] = {0.0, 0.75, 1.0};
    
    CGColorSpaceRef baseSpace   = CGColorSpaceCreateDeviceRGB();
    CGGradientRef gradient      = CGGradientCreateWithColorComponents(baseSpace, colors, locations, 2);
    
    CGContextRef context    = UIGraphicsGetCurrentContext();
    
    CGFloat height          = rect.size.height;
    CGPoint startPoint      = CGPointMake(CGRectGetMidX(rect), height);
    CGPoint endPoint        = CGPointMake(CGRectGetMidX(rect), CGRectGetMaxY(rect));
    
    CGContextDrawLinearGradient(context, gradient, startPoint, endPoint, kCGGradientDrawsBeforeStartLocation);
    
    CGSize titleSize        = [self.text sizeWithFont:self.font];
    [self.textColor set];
    [self.text drawAtPoint:CGPointMake(rect.size.width - titleSize.width - 2 , (height - 12) / 2)
                   forWidth:kThumbnailLength
                   withFont:self.font
                   fontSize:12
              lineBreakMode:NSLineBreakByTruncatingTail
         baselineAdjustment:UIBaselineAdjustmentAlignCenters];

    UIImage *videoIcon=[UIImage imageWithContentsOfFile:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"ZYQAssetPicker.Bundle/Images/AssetsPickerVideo@2x.png"]];
    
    [videoIcon drawAtPoint:CGPointMake(2, (height - videoIcon.size.height) / 2)];
    
}

@end

#pragma mark - ZYQTapAssetView

@interface ZYQTapAssetView ()

@property(nonatomic,retain)UIImageView *selectView;

@end

@implementation ZYQTapAssetView

static UIImage *checkedIcon;
static UIColor *selectedColor;
static UIColor *disabledColor;

+ (void)initialize
{
    checkedIcon     = [UIImage imageWithContentsOfFile:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:[NSString stringWithFormat:@"ZYQAssetPicker.Bundle/Images/%@@2x.png",(!IS_IOS7) ? @"AssetsPickerChecked~iOS6" : @"AssetsPickerChecked"]]];
    selectedColor   = [UIColor colorWithWhite:1 alpha:0.3];
    disabledColor   = [UIColor colorWithWhite:1 alpha:0.9];
}

-(id)initWithFrame:(CGRect)frame{
    if (self=[super initWithFrame:frame]) {
        _selectView=[[UIImageView alloc] initWithFrame:CGRectMake(frame.size.width-checkedIcon.size.width, frame.size.height-checkedIcon.size.height, checkedIcon.size.width, checkedIcon.size.height)];
        [self addSubview:_selectView];
    }
    return self;
}

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
    if (_disabled) {
        return;
    }
    
    if (_delegate!=nil&&[_delegate respondsToSelector:@selector(shouldTap)]) {
        if (![_delegate shouldTap]&&!_selected) {
            return;
        }
    }

    if ((_selected=!_selected)) {
        self.backgroundColor=selectedColor;
        [_selectView setImage:checkedIcon];
    }
    else{
        self.backgroundColor=[UIColor clearColor];
        [_selectView setImage:nil];
    }
    if (_delegate!=nil&&[_delegate respondsToSelector:@selector(touchSelect:)]) {
        [_delegate touchSelect:_selected];
    }
}

-(void)setDisabled:(BOOL)disabled{
    _disabled=disabled;
    if (_disabled) {
        self.backgroundColor=disabledColor;
    }
    else{
        self.backgroundColor=[UIColor clearColor];
    }
}

-(void)setSelected:(BOOL)selected{
    if (_disabled) {
        self.backgroundColor=disabledColor;
        [_selectView setImage:nil];
        return;
    }

    _selected=selected;
    if (_selected) {
        self.backgroundColor=selectedColor;
        [_selectView setImage:checkedIcon];
    }
    else{
        self.backgroundColor=[UIColor clearColor];
        [_selectView setImage:nil];
    }
}

@end

#pragma mark - ZYQAssetView

@interface ZYQAssetView ()<ZYQTapAssetViewDelegate>

@property (nonatomic, strong) ALAsset *asset;

@property (nonatomic, weak) id<ZYQAssetViewDelegate> delegate;

@property (nonatomic, retain) UIImageView *imageView;
@property (nonatomic, retain) ZYQVideoTitleView *videoTitle;
@property (nonatomic, retain) ZYQTapAssetView *tapAssetView;

@end

@implementation ZYQAssetView

static UIFont *titleFont = nil;

static CGFloat titleHeight;
static UIColor *titleColor;

+ (void)initialize
{
    titleFont       = [UIFont systemFontOfSize:12];
    titleHeight     = 20.0f;
    titleColor      = [UIColor whiteColor];
}

- (id)initWithFrame:(CGRect)frame
{
    if (self = [super initWithFrame:frame])
    {
        self.opaque                     = YES;
        self.isAccessibilityElement     = YES;
        self.accessibilityTraits        = UIAccessibilityTraitImage;
        
        _imageView=[[UIImageView alloc] initWithFrame:CGRectMake(0, 0, kThumbnailSize.width, kThumbnailSize.height)];
        [self addSubview:_imageView];
        
        _videoTitle=[[ZYQVideoTitleView alloc] initWithFrame:CGRectMake(0, kThumbnailSize.height-20, kThumbnailSize.width, titleHeight)];
        _videoTitle.hidden=YES;
        _videoTitle.font=titleFont;
        _videoTitle.textColor=titleColor;
        _videoTitle.textAlignment=NSTextAlignmentRight;
        _videoTitle.backgroundColor=[UIColor clearColor];
        [self addSubview:_videoTitle];
        
        _tapAssetView=[[ZYQTapAssetView alloc] initWithFrame:CGRectMake(0, 0, frame.size.width, frame.size.height)];
        _tapAssetView.delegate=self;
        [self addSubview:_tapAssetView];
    }
    
    return self;
}

- (void)bind:(ALAsset *)asset selectionFilter:(NSPredicate*)selectionFilter isSeleced:(BOOL)isSeleced
{
    self.asset=asset;
    
    [_imageView setImage:[UIImage imageWithCGImage:asset.thumbnail]];
    
    if ([[asset valueForProperty:ALAssetPropertyType] isEqual:ALAssetTypeVideo]) {
        _videoTitle.hidden=NO;
        _videoTitle.text=[NSDate timeDescriptionOfTimeInterval:[[asset valueForProperty:ALAssetPropertyDuration] doubleValue]];
    }
    else{
        _videoTitle.hidden=YES;
    }
    
    _tapAssetView.disabled=! [selectionFilter evaluateWithObject:asset];
    
    _tapAssetView.selected=isSeleced;
}

#pragma mark - ZYQTapAssetView Delegate

-(BOOL)shouldTap{
    if (_delegate!=nil&&[_delegate respondsToSelector:@selector(shouldSelectAsset:)]) {
        return [_delegate shouldSelectAsset:_asset];
    }
    return YES;
}

-(void)touchSelect:(BOOL)select{
    if (_delegate!=nil&&[_delegate respondsToSelector:@selector(tapSelectHandle:asset:)]) {
        [_delegate tapSelectHandle:select asset:_asset];
    }
}

@end

#pragma mark - ZYQAssetViewCell

@interface ZYQAssetViewCell ()<ZYQAssetViewDelegate>

@end

@class ZYQAssetViewController;

@implementation ZYQAssetViewCell

- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier{
    if ([super initWithStyle:style reuseIdentifier:reuseIdentifier]) {
        [self setSelectionStyle:UITableViewCellSelectionStyleNone];
    }
    return self;
}

- (void)bind:(NSArray *)assets selectionFilter:(NSPredicate*)selectionFilter minimumInteritemSpacing:(float)minimumInteritemSpacing minimumLineSpacing:(float)minimumLineSpacing columns:(int)columns assetViewX:(float)assetViewX{
    
    if (self.contentView.subviews.count<assets.count) {
        for (int i=0; i<assets.count; i++) {
            if (i>((NSInteger)self.contentView.subviews.count-1)) {
                ZYQAssetView *assetView=[[ZYQAssetView alloc] initWithFrame:CGRectMake(assetViewX+(kThumbnailSize.width+minimumInteritemSpacing)*i, minimumLineSpacing-1, kThumbnailSize.width, kThumbnailSize.height)];
                [assetView bind:assets[i] selectionFilter:selectionFilter isSeleced:[((ZYQAssetViewController*)_delegate).indexPathsForSelectedItems containsObject:assets[i]]];
                assetView.delegate=self;
                [self.contentView addSubview:assetView];
            }
            else{
                ((ZYQAssetView*)self.contentView.subviews[i]).frame=CGRectMake(assetViewX+(kThumbnailSize.width+minimumInteritemSpacing)*(i), minimumLineSpacing-1, kThumbnailSize.width, kThumbnailSize.height);
                [(ZYQAssetView*)self.contentView.subviews[i] bind:assets[i] selectionFilter:selectionFilter isSeleced:[((ZYQAssetViewController*)_delegate).indexPathsForSelectedItems containsObject:assets[i]]];
            }

        }
        
    }
    else{
        for (int i=self.contentView.subviews.count; i>0; i--) {
            if (i>assets.count) {
                [((ZYQAssetView*)self.contentView.subviews[i-1]) removeFromSuperview];
            }
            else{
                ((ZYQAssetView*)self.contentView.subviews[i-1]).frame=CGRectMake(assetViewX+(kThumbnailSize.width+minimumInteritemSpacing)*(i-1), minimumLineSpacing-1, kThumbnailSize.width, kThumbnailSize.height);
                [(ZYQAssetView*)self.contentView.subviews[i-1] bind:assets[i-1] selectionFilter:selectionFilter isSeleced:[((ZYQAssetViewController*)_delegate).indexPathsForSelectedItems containsObject:assets[i-1]]];
            }
        }
    }
}

#pragma mark - ZYQAssetView Delegate

-(BOOL)shouldSelectAsset:(ALAsset *)asset{
    if (_delegate!=nil&&[_delegate respondsToSelector:@selector(shouldSelectAsset:)]) {
        return [_delegate shouldSelectAsset:asset];
    }
    return YES;
}

-(void)tapSelectHandle:(BOOL)select asset:(ALAsset *)asset{
    if (select) {
        if (_delegate!=nil&&[_delegate respondsToSelector:@selector(didSelectAsset:)]) {
            [_delegate didSelectAsset:asset];
        }
    }
    else{
        if (_delegate!=nil&&[_delegate respondsToSelector:@selector(didDeselectAsset:)]) {
            [_delegate didDeselectAsset:asset];
        }
    }
}

@end

#pragma mark - ZYQAssetViewController
#import "HGPhWViewController.h"
@interface ZYQAssetViewController ()<ZYQAssetViewCellDelegate>{
    int columns;
    
    float minimumInteritemSpacing;
    float minimumLineSpacing;
    
    BOOL unFirst;
}

@property (nonatomic, strong) NSMutableArray *assets;
@property (nonatomic, assign) NSInteger numberOfPhotos;
@property (nonatomic, assign) NSInteger numberOfVideos;

@end

#define kAssetViewCellIdentifier           @"AssetViewCellIdentifier"

@implementation ZYQAssetViewController

- (id)init
{
    
#pragma  添加原始本地的imgAssets
//    if ([[HGPhWViewController shareInstance] allImgAssets].count > 0) {
//        _indexPathsForSelectedItems = [NSMutableArray arrayWithArray:[[HGPhWViewController shareInstance] allImgAssets]];
//    } else {
//        _indexPathsForSelectedItems=[[NSMutableArray alloc] init];
//    }
    
     _indexPathsForSelectedItems=[[NSMutableArray alloc] init];
    
    if (UIInterfaceOrientationIsLandscape(self.interfaceOrientation))
    {
        self.tableView.contentInset=UIEdgeInsetsMake(9.0, 2.0, 0, 2.0);
        
        minimumInteritemSpacing=3;
        minimumLineSpacing=3;
        
    }
    else
    {
        self.tableView.contentInset=UIEdgeInsetsMake(9.0, 0, 0, 0);
        
        minimumInteritemSpacing=2;
        minimumLineSpacing=2;
    }
    
    if (self = [super init])
    {
        if ([self respondsToSelector:@selector(setEdgesForExtendedLayout:)])
            [self setEdgesForExtendedLayout:UIRectEdgeNone];
        
        if ([self respondsToSelector:@selector(setContentSizeForViewInPopover:)])
            [self setContentSizeForViewInPopover:kPopoverContentSize];
    }
    
    [self.tableView setSeparatorStyle:UITableViewCellSeparatorStyleNone];
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    [self setupViews];
    [self setupButtons];
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    if (!unFirst) {
        columns=floor(self.view.frame.size.width/(kThumbnailSize.width+minimumInteritemSpacing));
        
        [self setupAssets];
        
        unFirst=YES;
    }
}


#pragma mark - Rotation

- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
{
    if (UIInterfaceOrientationIsLandscape(toInterfaceOrientation))
    {
        self.tableView.contentInset=UIEdgeInsetsMake(9.0, 0, 0, 0);
        
        minimumInteritemSpacing=3;
        minimumLineSpacing=3;
    }
    else
    {
        self.tableView.contentInset=UIEdgeInsetsMake(9.0, 0, 0, 0);
        
        minimumInteritemSpacing=2;
        minimumLineSpacing=2;
    }
    
    columns=floor(self.view.frame.size.width/(kThumbnailSize.width+minimumInteritemSpacing));

    [self.tableView reloadData];
}

#pragma mark - Setup

- (void)setupViews
{
    self.tableView.backgroundColor = [UIColor whiteColor];
}

- (void)setupButtons
{
    self.navigationItem.rightBarButtonItem =
    [[UIBarButtonItem alloc] initWithTitle:NSLocalizedString(@"完成", nil)
                                     style:UIBarButtonItemStylePlain
                                    target:self
                                    action:@selector(finishPickingAssets:)];
}

- (void)setupAssets
{
    self.title = [self.assetsGroup valueForProperty:ALAssetsGroupPropertyName];
    self.numberOfPhotos = 0;
    self.numberOfVideos = 0;
    
    if (!self.assets)
        self.assets = [[NSMutableArray alloc] init];
    else
        [self.assets removeAllObjects];
    
    ALAssetsGroupEnumerationResultsBlock resultsBlock = ^(ALAsset *asset, NSUInteger index, BOOL *stop) {
        
        if (asset)
        {
            [self.assets addObject:asset];
            
            NSString *type = [asset valueForProperty:ALAssetPropertyType];
            
            if ([type isEqual:ALAssetTypePhoto])
                self.numberOfPhotos ++;
            if ([type isEqual:ALAssetTypeVideo])
                self.numberOfVideos ++;
        }
        
        else if (self.assets.count > 0)
        {
            [self.tableView reloadData];

            [self.tableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:ceil(self.assets.count*1.0/columns)  inSection:0] atScrollPosition:UITableViewScrollPositionTop animated:YES];
        }
    };
    
    [self.assetsGroup enumerateAssetsUsingBlock:resultsBlock];
}

#pragma mark - UITableView DataSource
-(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    
    if (indexPath.row==ceil(self.assets.count*1.0/columns)) {
        UITableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:@"cellFooter"];
        
        if (cell==nil) {
            cell=[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"cellFooter"];
            cell.textLabel.font=[UIFont systemFontOfSize:18];
            cell.textLabel.backgroundColor=[UIColor clearColor];
            cell.textLabel.textAlignment=NSTextAlignmentCenter;
            cell.textLabel.textColor=[UIColor blackColor];
            cell.backgroundColor=[UIColor clearColor];
            [cell setSelectionStyle:UITableViewCellSelectionStyleNone];
        }
        
        NSString *title;
        
        if (_numberOfVideos == 0)
            title = [NSString stringWithFormat:NSLocalizedString(@"%ld 张照片", nil), (long)_numberOfPhotos];
        else if (_numberOfPhotos == 0)
            title = [NSString stringWithFormat:NSLocalizedString(@"%ld 部视频", nil), (long)_numberOfVideos];
        else
            title = [NSString stringWithFormat:NSLocalizedString(@"%ld 张照片, %ld 部视频", nil), (long)_numberOfPhotos, (long)_numberOfVideos];
        
        cell.textLabel.text=title;
        return cell;
    }
    
    
    NSMutableArray *tempAssets=[[NSMutableArray alloc] init];
    for (int i=0; i<columns; i++) {
        if ((indexPath.row*columns+i)<self.assets.count) {
            [tempAssets addObject:[self.assets objectAtIndex:indexPath.row*columns+i]];
        }
    }
    
    static NSString *CellIdentifier = kAssetViewCellIdentifier;
    ZYQAssetPickerController *picker = (ZYQAssetPickerController *)self.navigationController;
    
    ZYQAssetViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell==nil) {
        cell=[[ZYQAssetViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }
    cell.delegate=self;

    [cell bind:tempAssets selectionFilter:picker.selectionFilter minimumInteritemSpacing:minimumInteritemSpacing minimumLineSpacing:minimumLineSpacing columns:columns assetViewX:(self.tableView.frame.size.width-kThumbnailSize.width*tempAssets.count-minimumInteritemSpacing*(tempAssets.count-1))/2];
    return cell;
}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    return ceil(self.assets.count*1.0/columns)+1;
}

#pragma mark - UITableView Delegate

-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
    if (indexPath.row==ceil(self.assets.count*1.0/columns)) {
        return 44;
    }
    return kThumbnailSize.height+minimumLineSpacing;
}


#pragma mark - ZYQAssetViewCell Delegate

- (BOOL)shouldSelectAsset:(ALAsset *)asset
{
    ZYQAssetPickerController *vc = (ZYQAssetPickerController *)self.navigationController;
    BOOL selectable = [vc.selectionFilter evaluateWithObject:asset];
    if (_indexPathsForSelectedItems.count > vc.maximumNumberOfSelection) {
        if (vc.delegate!=nil&&[vc.delegate respondsToSelector:@selector(assetPickerControllerDidMaximum:)]) {
            [vc.delegate assetPickerControllerDidMaximum:vc];
        }
    }
    
    return (selectable && _indexPathsForSelectedItems.count < vc.maximumNumberOfSelection);
}

- (void)didSelectAsset:(ALAsset *)asset
{
    [_indexPathsForSelectedItems addObject:asset];
    
    ZYQAssetPickerController *vc = (ZYQAssetPickerController *)self.navigationController;
    vc.indexPathsForSelectedItems = _indexPathsForSelectedItems;
    
    if (vc.delegate!=nil&&[vc.delegate respondsToSelector:@selector(assetPickerController:didSelectAsset:)])
        [vc.delegate assetPickerController:vc didSelectAsset:asset];
    
    [self setTitleWithSelectedIndexPaths:_indexPathsForSelectedItems];
}

- (void)didDeselectAsset:(ALAsset *)asset
{
    [_indexPathsForSelectedItems removeObject:asset];
    
    ZYQAssetPickerController *vc = (ZYQAssetPickerController *)self.navigationController;
    vc.indexPathsForSelectedItems = _indexPathsForSelectedItems;
    
    if (vc.delegate!=nil&&[vc.delegate respondsToSelector:@selector(assetPickerController:didDeselectAsset:)])
        [vc.delegate assetPickerController:vc didDeselectAsset:asset];
    
    [self setTitleWithSelectedIndexPaths:_indexPathsForSelectedItems];
}


#pragma mark - Title

- (void)setTitleWithSelectedIndexPaths:(NSArray *)indexPaths
{
    // Reset title to group name
    if (indexPaths.count == 0)
    {
        self.title = [self.assetsGroup valueForProperty:ALAssetsGroupPropertyName];
        return;
    }
    
    BOOL photosSelected = NO;
    BOOL videoSelected  = NO;
    
    for (int i=0; i<indexPaths.count; i++) {
        ALAsset *asset = indexPaths[i];
        
        if ([[asset valueForProperty:ALAssetPropertyType] isEqual:ALAssetTypePhoto])
            photosSelected  = YES;
        
        if ([[asset valueForProperty:ALAssetPropertyType] isEqual:ALAssetTypeVideo])
            videoSelected   = YES;
        
        if (photosSelected && videoSelected)
            break;

    }
    
    NSString *format;
    
    if (photosSelected && videoSelected)
        format = NSLocalizedString(@"已选择 %ld 个项目", nil);
    
    else if (photosSelected)
        format = (indexPaths.count > 1) ? NSLocalizedString(@"已选择 %ld 张照片", nil) : NSLocalizedString(@"已选择 %ld 张照片 ", nil);
    
    else if (videoSelected)
        format = (indexPaths.count > 1) ? NSLocalizedString(@"已选择 %ld 部视频", nil) : NSLocalizedString(@"已选择 %ld 部视频 ", nil);
    
    self.title = [NSString stringWithFormat:format, (long)indexPaths.count];
}


#pragma mark - Actions

- (void)finishPickingAssets:(id)sender
{
    
    ZYQAssetPickerController *picker = (ZYQAssetPickerController *)self.navigationController;
    
    if (_indexPathsForSelectedItems.count < picker.minimumNumberOfSelection) {
        if (picker.delegate!=nil&&[picker.delegate respondsToSelector:@selector(assetPickerControllerDidMaximum:)]) {
            [picker.delegate assetPickerControllerDidMaximum:picker];
        }
    }
    

    if ([picker.delegate respondsToSelector:@selector(assetPickerController:didFinishPickingAssets:)])
        [picker.delegate assetPickerController:picker didFinishPickingAssets:_indexPathsForSelectedItems];
    
    if (picker.isFinishDismissViewController) {
        [picker.presentingViewController dismissViewControllerAnimated:YES completion:NULL];
    }
}

@end

#pragma mark - ZYQAssetGroupViewCell

@interface ZYQAssetGroupViewCell ()

@property (nonatomic, strong) ALAssetsGroup *assetsGroup;

@end

@implementation ZYQAssetGroupViewCell


- (void)bind:(ALAssetsGroup *)assetsGroup
{
    self.assetsGroup            = assetsGroup;
    
    CGImageRef posterImage      = assetsGroup.posterImage;
    size_t height               = CGImageGetHeight(posterImage);
    float scale                 = height / kThumbnailLength;
    
    self.imageView.image        = [UIImage imageWithCGImage:posterImage scale:scale orientation:UIImageOrientationUp];
    self.textLabel.text         = [assetsGroup valueForProperty:ALAssetsGroupPropertyName];
    self.detailTextLabel.text   = [NSString stringWithFormat:@"%ld", (long)[assetsGroup numberOfAssets]];
    self.accessoryType          = UITableViewCellAccessoryDisclosureIndicator;
}

- (NSString *)accessibilityLabel
{
    NSString *label = [self.assetsGroup valueForProperty:ALAssetsGroupPropertyName];
    
    return [label stringByAppendingFormat:NSLocalizedString(@"%ld 张照片", nil), (long)[self.assetsGroup numberOfAssets]];
}

@end


#pragma mark - ZYQAssetGroupViewController

@interface ZYQAssetGroupViewController()

@property (nonatomic, strong) ALAssetsLibrary *assetsLibrary;
@property (nonatomic, strong) NSMutableArray *groups;

@end

@implementation ZYQAssetGroupViewController

- (id)init
{
    if (self = [super initWithStyle:UITableViewStylePlain])
    {
#if __IPHONE_OS_VERSION_MIN_REQUIRED >= __IPHONE_7_0
        self.preferredContentSize=kPopoverContentSize;
#else
        if ([self respondsToSelector:@selector(setContentSizeForViewInPopover:)])
            [self setContentSizeForViewInPopover:kPopoverContentSize];
#endif
    }
    
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    [self setupViews];
    [self setupButtons];
    [self localize];
    [self setupGroup];
}


#pragma mark - Rotation

- (BOOL)shouldAutorotate
{
    return YES;
}

- (NSUInteger)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskAllButUpsideDown;
}


#pragma mark - Setup

- (void)setupViews
{
    self.tableView.rowHeight = kThumbnailLength + 12;
    self.tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
}

- (void)setupButtons
{
    ZYQAssetPickerController *picker = (ZYQAssetPickerController *)self.navigationController;
    
    if (picker.showCancelButton)
    {
        self.navigationItem.rightBarButtonItem =
        [[UIBarButtonItem alloc] initWithTitle:NSLocalizedString(@"取消", nil)
                                         style:UIBarButtonItemStylePlain
                                        target:self
                                        action:@selector(dismiss:)];
    }
}

- (void)localize
{
    self.title = NSLocalizedString(@"相簿", nil);
}

- (void)setupGroup
{
    if (!self.assetsLibrary)
        self.assetsLibrary = [self.class defaultAssetsLibrary];
    
    if (!self.groups)
        self.groups = [[NSMutableArray alloc] init];
    else
        [self.groups removeAllObjects];
    
    ZYQAssetPickerController *picker = (ZYQAssetPickerController *)self.navigationController;
    ALAssetsFilter *assetsFilter = picker.assetsFilter;
    
    ALAssetsLibraryGroupsEnumerationResultsBlock resultsBlock = ^(ALAssetsGroup *group, BOOL *stop) {
        
        if (group)
        {
            [group setAssetsFilter:assetsFilter];
            if (group.numberOfAssets > 0 || picker.showEmptyGroups)
                [self.groups addObject:group];
        }
        else
        {
            [self reloadData];
        }
    };
    
    
    ALAssetsLibraryAccessFailureBlock failureBlock = ^(NSError *error) {
        
        [self showNotAllowed];
        
    };
    
    // Enumerate Camera roll first
    [self.assetsLibrary enumerateGroupsWithTypes:ALAssetsGroupSavedPhotos
                                      usingBlock:resultsBlock
                                    failureBlock:failureBlock];
    
    // Then all other groups
    NSUInteger type =
    ALAssetsGroupLibrary | ALAssetsGroupAlbum | ALAssetsGroupEvent |
    ALAssetsGroupFaces | ALAssetsGroupPhotoStream;
    
    [self.assetsLibrary enumerateGroupsWithTypes:type
                                      usingBlock:resultsBlock
                                    failureBlock:failureBlock];
}


#pragma mark - Reload Data

- (void)reloadData
{
    if (self.groups.count == 0)
        [self showNoAssets];
    
    [self.tableView reloadData];
}


#pragma mark - ALAssetsLibrary

+ (ALAssetsLibrary *)defaultAssetsLibrary
{
    static dispatch_once_t pred = 0;
    static ALAssetsLibrary *library = nil;
    dispatch_once(&pred, ^{
        library = [[ALAssetsLibrary alloc] init];
    });
    return library;
}


#pragma mark - Not allowed / No assets

- (void)showNotAllowed
{
    if ([self respondsToSelector:@selector(setEdgesForExtendedLayout:)])
        [self setEdgesForExtendedLayout:UIRectEdgeLeft | UIRectEdgeRight | UIRectEdgeBottom];
    
    self.title              = nil;
    
    UIImageView *padlock    = [[UIImageView alloc] initWithImage:[UIImage imageWithContentsOfFile:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"ZYQAssetPicker.Bundle/Images/AssetsPickerLocked@2x.png"]]];
    padlock.translatesAutoresizingMaskIntoConstraints = NO;
    
    UILabel *title          = [UILabel new];
    title.translatesAutoresizingMaskIntoConstraints = NO;
    title.preferredMaxLayoutWidth = 304.0f;
    
    UILabel *message        = [UILabel new];
    message.translatesAutoresizingMaskIntoConstraints = NO;
    message.preferredMaxLayoutWidth = 304.0f;
    
    title.text              = NSLocalizedString(@"此应用无法使用您的照片或视频。", nil);
    title.font              = [UIFont boldSystemFontOfSize:17.0];
    title.textColor         = [UIColor colorWithRed:129.0/255.0 green:136.0/255.0 blue:148.0/255.0 alpha:1];
    title.textAlignment     = NSTextAlignmentCenter;
    title.numberOfLines     = 5;
    
    message.text            = NSLocalizedString(@"你可以在「隐私设置」中启用存取。", nil);
    message.font            = [UIFont systemFontOfSize:14.0];
    message.textColor       = [UIColor colorWithRed:129.0/255.0 green:136.0/255.0 blue:148.0/255.0 alpha:1];
    message.textAlignment   = NSTextAlignmentCenter;
    message.numberOfLines   = 5;
    
    [title sizeToFit];
    [message sizeToFit];
    
    UIView *centerView = [UIView new];
    centerView.translatesAutoresizingMaskIntoConstraints = NO;
    [centerView addSubview:padlock];
    [centerView addSubview:title];
    [centerView addSubview:message];
    
    NSDictionary *viewsDictionary = NSDictionaryOfVariableBindings(padlock, title, message);
    
    [centerView addConstraint:[NSLayoutConstraint constraintWithItem:padlock attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:centerView attribute:NSLayoutAttributeCenterX multiplier:1.0f constant:0.0f]];
    [centerView addConstraint:[NSLayoutConstraint constraintWithItem:title attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:padlock attribute:NSLayoutAttributeCenterX multiplier:1.0f constant:0.0f]];
    [centerView addConstraint:[NSLayoutConstraint constraintWithItem:message attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:padlock attribute:NSLayoutAttributeCenterX multiplier:1.0f constant:0.0f]];
    [centerView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[padlock]-[title]-[message]|" options:0 metrics:nil views:viewsDictionary]];
    
    UIView *backgroundView = [UIView new];
    [backgroundView addSubview:centerView];
    [backgroundView addConstraint:[NSLayoutConstraint constraintWithItem:centerView attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:backgroundView attribute:NSLayoutAttributeCenterX multiplier:1.0f constant:0.0f]];
    [backgroundView addConstraint:[NSLayoutConstraint constraintWithItem:centerView attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:backgroundView attribute:NSLayoutAttributeCenterY multiplier:1.0f constant:0.0f]];
    
    self.tableView.backgroundView = backgroundView;
}

- (void)showNoAssets
{
    if ([self respondsToSelector:@selector(setEdgesForExtendedLayout:)])
        [self setEdgesForExtendedLayout:UIRectEdgeLeft | UIRectEdgeRight | UIRectEdgeBottom];
    
    UILabel *title          = [UILabel new];
    title.translatesAutoresizingMaskIntoConstraints = NO;
    title.preferredMaxLayoutWidth = 304.0f;
    UILabel *message        = [UILabel new];
    message.translatesAutoresizingMaskIntoConstraints = NO;
    message.preferredMaxLayoutWidth = 304.0f;
    
    title.text              = NSLocalizedString(@"没有照片或视频。", nil);
    title.font              = [UIFont systemFontOfSize:26.0];
    title.textColor         = [UIColor colorWithRed:153.0/255.0 green:153.0/255.0 blue:153.0/255.0 alpha:1];
    title.textAlignment     = NSTextAlignmentCenter;
    title.numberOfLines     = 5;
    
    message.text            = NSLocalizedString(@"您可以使用 iTunes 将照片和视频\n同步到 iPhone。", nil);
    message.font            = [UIFont systemFontOfSize:18.0];
    message.textColor       = [UIColor colorWithRed:153.0/255.0 green:153.0/255.0 blue:153.0/255.0 alpha:1];
    message.textAlignment   = NSTextAlignmentCenter;
    message.numberOfLines   = 5;
    
    [title sizeToFit];
    [message sizeToFit];
    
    UIView *centerView = [UIView new];
    centerView.translatesAutoresizingMaskIntoConstraints = NO;
    [centerView addSubview:title];
    [centerView addSubview:message];
    
    NSDictionary *viewsDictionary = NSDictionaryOfVariableBindings(title, message);
    
    [centerView addConstraint:[NSLayoutConstraint constraintWithItem:title attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:centerView attribute:NSLayoutAttributeCenterX multiplier:1.0f constant:0.0f]];
    [centerView addConstraint:[NSLayoutConstraint constraintWithItem:message attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:title attribute:NSLayoutAttributeCenterX multiplier:1.0f constant:0.0f]];
    [centerView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[title]-[message]|" options:0 metrics:nil views:viewsDictionary]];
    
    UIView *backgroundView = [UIView new];
    [backgroundView addSubview:centerView];
    [backgroundView addConstraint:[NSLayoutConstraint constraintWithItem:centerView attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:backgroundView attribute:NSLayoutAttributeCenterX multiplier:1.0f constant:0.0f]];
    [backgroundView addConstraint:[NSLayoutConstraint constraintWithItem:centerView attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:backgroundView attribute:NSLayoutAttributeCenterY multiplier:1.0f constant:0.0f]];
    
    self.tableView.backgroundView = backgroundView;
}



#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return self.groups.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";
    
    ZYQAssetGroupViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil)
    {
        cell = [[ZYQAssetGroupViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
    }
    
    [cell bind:[self.groups objectAtIndex:indexPath.row]];
    
    return cell;
}


#pragma mark - UITableView Delegate

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return kThumbnailLength + 12;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    ZYQAssetViewController *vc = [[ZYQAssetViewController alloc] init];
    vc.assetsGroup = [self.groups objectAtIndex:indexPath.row];
    
    [self.navigationController pushViewController:vc animated:YES];
}

#pragma mark - Actions

- (void)dismiss:(id)sender
{
    ZYQAssetPickerController *picker = (ZYQAssetPickerController *)self.navigationController;
    
    if ([picker.delegate respondsToSelector:@selector(assetPickerControllerDidCancel:)])
        [picker.delegate assetPickerControllerDidCancel:picker];
    
    [picker.presentingViewController dismissViewControllerAnimated:YES completion:NULL];
}

@end

#pragma mark - ZYQAssetPickerController

@implementation ZYQAssetPickerController

- (id)init
{
    ZYQAssetGroupViewController *groupViewController = [[ZYQAssetGroupViewController alloc] init];
    
    if (self = [super initWithRootViewController:groupViewController])
    {
        _maximumNumberOfSelection      = 10;
        _minimumNumberOfSelection      = 0;
        _assetsFilter                  = [ALAssetsFilter allAssets];
        _showCancelButton              = YES;
        _showEmptyGroups               = NO;
        _selectionFilter               = [NSPredicate predicateWithValue:YES];
        _isFinishDismissViewController = YES;
        
#if __IPHONE_OS_VERSION_MIN_REQUIRED >= __IPHONE_7_0
        self.preferredContentSize=kPopoverContentSize;
#else
        if ([self respondsToSelector:@selector(setContentSizeForViewInPopover:)])
            [self setContentSizeForViewInPopover:kPopoverContentSize];
#endif
    }
    
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
}

@end