QRViewController.m

//
//  QRViewController.m
//  QRWeiXinDemo
//
//  Created by lovelydd on 15/4/25.
//  Copyright (c) 2015年 lovelydd. All rights reserved.
//

#import "QRViewController.h"
#import <AVFoundation/AVFoundation.h>
#import "QRView.h"
#import "QRUtil.h"
@interface QRViewController ()<AVCaptureMetadataOutputObjectsDelegate,QRViewDelegate>

@property (strong, nonatomic) AVCaptureDevice * device;
@property (strong, nonatomic) AVCaptureDeviceInput * input;
@property (strong, nonatomic) AVCaptureMetadataOutput * output;
@property (strong, nonatomic) AVCaptureSession * session;
@property (strong, nonatomic) AVCaptureVideoPreviewLayer * preview;

@property (nonatomic, strong) UIButton *backBtn;

@property (nonatomic, strong) QRView *qrView;

@property (nonatomic, copy) ScanCompleteBlock scanCompleteBlock;

@property (nonatomic, copy, readwrite) NSString *urlString;

/**
 *  提示lebe
 */
@property (nonatomic,strong) UILabel *Titlelabe;

/**
 *计时器
 */
@property (strong, nonatomic) CADisplayLink *link;

/**
 *  指示线
 */
@property (strong, nonatomic) UIImageView *instructionsLine;


/**
 *用于记录scrollLine的上下循环状态
 */
@property (assign, nonatomic) BOOL up;

@end

@implementation QRViewController

#pragma mark - Life Cycle
- (void)viewDidLoad {
    [super viewDidLoad];
    
    //计时器添加到循环中去
    _up = YES;
    [self.link addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSRunLoopCommonModes];
    [self defaultConfig];       //初始化配置,主要是二维码的配置
    [self configUI];
    [self updateLayout];
}



- (void)defaultConfig {
    [self startRunning];
}


- (void)viewWillAppear:(BOOL)animated {
    
    [super viewWillAppear:animated];
    if (![_session isRunning]) {
        
        [self startRunning];
    }
   
}
- (void)viewWillDisappear:(BOOL)animated {

    [super viewWillDisappear:animated];
    [self stopRunning];
}

- (void)configUI {
    
    [self.view addSubview:self.qrView];
    [self.view addSubview:self.backBtn];
    [self.view addSubview:self.Titlelabe];
    [self.view addSubview:self.instructionsLine];
}



- (void)updateLayout {
    
    
    
    _qrView.center = CGPointMake([QRUtil screenBounds].size.width / 2, [QRUtil screenBounds].size.height / 2);
    
    //修正扫描区域
    CGFloat screenHeight = self.view.frame.size.height;
    CGFloat screenWidth = self.view.frame.size.width;
    CGRect cropRect = CGRectMake((screenWidth - self.qrView.transparentArea.width) / 2,
                                 (screenHeight - self.qrView.transparentArea.height) / 2,
                                 self.qrView.transparentArea.width,
                                 self.qrView.transparentArea.height);
    
    [_output setRectOfInterest:CGRectMake(cropRect.origin.y / screenHeight,
                                          cropRect.origin.x / screenWidth,
                                          cropRect.size.height / screenHeight,
                                          cropRect.size.width / screenWidth)];
}

- (void)pop:(UIButton *)button {
    

    [self dismissViewControllerAnimated:YES completion:^{
        if (self.cancelScanBlock) {
            self.cancelScanBlock();
        }
    }];
}

#pragma mark - Public Method
-(instancetype)initWithScanCompleteHandler:(ScanCompleteBlock)scanCompleteBlock {
    
    self = [super init];
    if (self) {
        _scanCompleteBlock = scanCompleteBlock;
    }
    return self;
}

- (void)startRunning {
    

    _device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    // Input
    _input = [AVCaptureDeviceInput deviceInputWithDevice:self.device error:nil];
    // Output
    _output = [[AVCaptureMetadataOutput alloc]init];
    [_output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
    
    // Session
    _session = [[AVCaptureSession alloc]init];
    [_session setSessionPreset:AVCaptureSessionPresetHigh];
    if ([_session canAddInput:self.input])
    {
        [_session addInput:self.input];
    }
    
    if ([_session canAddOutput:self.output])
    {
        [_session addOutput:self.output];
    }
    AVCaptureConnection *outputConnection = [_output connectionWithMediaType:AVMediaTypeVideo];
    outputConnection.videoOrientation = [QRUtil videoOrientationFromCurrentDeviceOrientation];
    // 条码类型 AVMetadataObjectTypeQRCode
    _output.metadataObjectTypes = @[AVMetadataObjectTypeEAN13Code,
                                    AVMetadataObjectTypeEAN8Code,
                                    AVMetadataObjectTypeCode128Code,
                                    AVMetadataObjectTypeQRCode];
    // Preview
    _preview =[AVCaptureVideoPreviewLayer layerWithSession:_session];
    _preview.videoGravity =AVLayerVideoGravityResize;
    _preview.frame =[QRUtil screenBounds];
    [self.view.layer insertSublayer:_preview atIndex:0];
    _preview.connection.videoOrientation = [QRUtil videoOrientationFromCurrentDeviceOrientation];
    [_session startRunning];
}

- (void)stopRunning {
   
    [_preview removeFromSuperlayer];
    [_session stopRunning];
    
}

//#pragma mark QRViewDelegate
//-(void)scanTypeConfig:(QRItem *)item {
//    
//    if (item.type == QRItemTypeQRCode) {
//        _output.metadataObjectTypes =@[AVMetadataObjectTypeQRCode];
//        
//    } else if (item.type == QRItemTypeOther) {
//        
//        _output.metadataObjectTypes = @[AVMetadataObjectTypeEAN13Code,
//                                        AVMetadataObjectTypeEAN8Code,
//                                        AVMetadataObjectTypeCode128Code,
//                                        AVMetadataObjectTypeQRCode,
//                                        AVMetadataObjectTypeQRCode];
//    }
//}
#pragma mark AVCaptureMetadataOutputObjectsDelegate
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection
{
    NSString *stringValue = @"";
    if ([metadataObjects count] >0)
    {
        //停止扫描
        [_session stopRunning];
        AVMetadataMachineReadableCodeObject * metadataObject = [metadataObjects objectAtIndex:0];
        stringValue = metadataObject.stringValue;
    }
    
    self.urlString = stringValue;
    
    NSLog(@" 扫描后的url是:%@",stringValue);
    
    if (self.scanCompleteBlock) {
        self.scanCompleteBlock(stringValue);
    }
}


#pragma mark - Getter and Setter
-(UIButton *)backBtn {
    
    if (!_backBtn) {
        _backBtn = [UIButton buttonWithType:UIButtonTypeCustom];
         _backBtn.frame = CGRectMake(50, ScreenHeight-80, 100, 50);
        [_backBtn setTitle:@"取消扫描" forState:UIControlStateNormal];
        [_backBtn addTarget:self action:@selector(pop:) forControlEvents:UIControlEventTouchUpInside];
    }
    return _backBtn;
}

#pragma mark -设置扫描范围
-(QRView *)qrView {
    
    if (!_qrView) {
        
        CGRect screenRect = [QRUtil screenBounds];
        _qrView = [[QRView alloc] initWithFrame:screenRect];
        _qrView.transparentArea = CGSizeMake(400, 400);

        _qrView.backgroundColor = [UIColor clearColor];
        _qrView.delegate = self;
    }
    return _qrView;
}


#pragma mark -提示文本
- (UILabel *)Titlelabe
{
    if (!_Titlelabe) {
        
        _Titlelabe = [[UILabel alloc]initWithFrame:CGRectMake((ScreenWidth-400)/2, 120, 400, 50)];
        _Titlelabe.text = @"将条形码/二维码放入框内，即可自动扫描";
        _Titlelabe.font = [UIFont systemFontOfSize:20];
        _Titlelabe.textColor = [UIColor whiteColor];
    }
    return _Titlelabe;
}

#pragma mark -指示器
- (UIImageView *)instructionsLine
{
    if (!_instructionsLine) {
        
        _instructionsLine = [[UIImageView alloc]initWithFrame:CGRectMake((ScreenWidth - self.qrView.transparentArea.width) / 2 +20, (ScreenHeight - self.qrView.transparentArea.height) / 2 +20, self.qrView.transparentArea.width-40, 15)];
        _instructionsLine.image = TCImage(@"圆角矩形-5");
    }
    return _instructionsLine;
}

#pragma mark -指示器动画
- (CADisplayLink *)link {
    if (!_link) {
        _link = [CADisplayLink displayLinkWithTarget:self selector:@selector(LineAnimation)];
    }
    return _link;
}


#pragma mark - 线条运动的动画
- (void)LineAnimation {
    if (_up == YES) {
        CGFloat y = self.instructionsLine.frame.origin.y;
        y += 4;
        CGRect frame = self.instructionsLine.frame;
        frame.origin.y = y;
        self.instructionsLine.frame = frame;
        if (y >= (ScreenHeight - self.qrView.transparentArea.height) / 2 +self.qrView.transparentArea.height-20) {
            _up = NO;
        }
    }else{
        CGFloat y = self.instructionsLine.frame.origin.y;
        y -= 4;
        CGRect frame = self.instructionsLine.frame;
        frame.origin.y = y;
        self.instructionsLine.frame = frame;;
        if (y <= (ScreenHeight - self.qrView.transparentArea.height) / 2 +20) {
            _up = YES;
        }
    }
}












@end