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//
// XWMagicMoveAnimator.m
// XWTADemo
//
// Created by wazrx on 16/6/8.
// Copyright © 2016年 wazrx. All rights reserved.
//
#import "XWMagicMoveAnimator.h"
#import <objc/runtime.h>
static NSString *const kXWMagicMovePropertyInViewKey = @"kXWMagicMovePropertyInViewKey";
@implementation UIView (XWTransition)
- (void)setMagicMoveImageMode:(BOOL)magicMoveImageMode{
objc_setAssociatedObject(self, &kXWMagicMovePropertyInViewKey, @(magicMoveImageMode), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
- (BOOL)magicMoveImageMode{
return [objc_getAssociatedObject(self, &kXWMagicMovePropertyInViewKey) boolValue];
}
@end
@implementation XWMagicMoveAnimator
- (void)xw_setToAnimation:(id<UIViewControllerContextTransitioning>)transitionContext{
[self _xw_doAniamtionWithContext:transitionContext fromFlag:YES];
}
- (void)xw_setBackAnimation:(id<UIViewControllerContextTransitioning>)transitionContext{
[self _xw_doAniamtionWithContext:transitionContext fromFlag:NO];
}
-(void)_xw_doAniamtionWithContext:(id<UIViewControllerContextTransitioning>)transitionContext fromFlag:(BOOL)flag{
UIViewController *fromVC = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
UIViewController *toVC = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
UIViewController *realFromVC = [self _xw_getRealContainsGroupViewController:fromVC];
UIViewController *realToVC = [self _xw_getRealContainsGroupViewController:toVC];
NSArray<UIView *> *startViewGroup = objc_getAssociatedObject(realFromVC, flag ? &kXWMagicMoveAnimatorStartViewVCKey : &kXWMagicMoveAnimatorEndViewVCKey);
NSArray<UIView *> *endViewGroup = objc_getAssociatedObject(realToVC, !flag ? &kXWMagicMoveAnimatorStartViewVCKey : &kXWMagicMoveAnimatorEndViewVCKey);
if (!startViewGroup.count || !endViewGroup.count || startViewGroup.count != endViewGroup.count) {
NSLog(@"神奇移动的视图为空，或者移动前后视图不相等");
[transitionContext completeTransition:NO];
return;
}
UIView *containerView = [transitionContext containerView];
toVC.view.alpha = 0.0f;
[containerView addSubview:toVC.view];
NSArray *toRects = [self _xw_getFrameValueFromViewGroup:endViewGroup inContainerView:containerView];
NSArray<UIView *> *tempViewGroup = [self _xw_makeTempViewGroupWithViewGroup:startViewGroup inContainerView:containerView];
[self _xw_changeHiddenViewInGroup:startViewGroup hidden:YES];
[self _xw_changeHiddenViewInGroup:endViewGroup hidden:YES];
if (self.dampingEnable) {
[UIView animateWithDuration:flag ? self.toDuration : self.backDuration delay:0.0f usingSpringWithDamping:0.55 initialSpringVelocity:1 / 0.55 options:UIViewAnimationOptionCurveLinear animations:^{
fromVC.view.alpha = 0.0f;
toVC.view.alpha = 1.0f;
[tempViewGroup enumerateObjectsUsingBlock:^(UIView *tempSubView, NSUInteger idx, BOOL * _Nonnull stop) {
CGRect toRect = [toRects[idx] CGRectValue];
tempSubView.frame = toRect;
}];
} completion:^(BOOL finished) {
[tempViewGroup makeObjectsPerformSelector:@selector(removeFromSuperview)];
fromVC.view.alpha = 1.0f;
[self _xw_changeHiddenViewInGroup:startViewGroup hidden:NO];
[self _xw_changeHiddenViewInGroup:endViewGroup hidden:NO];
[transitionContext completeTransition:![transitionContext transitionWasCancelled]];
}];
}else{
[UIView animateWithDuration:flag ? self.toDuration : self.backDuration animations:^{
fromVC.view.alpha = 0.0f;
toVC.view.alpha = 1.0f;
[tempViewGroup enumerateObjectsUsingBlock:^(UIView *tempSubView, NSUInteger idx, BOOL * _Nonnull stop) {
CGRect toRect = [toRects[idx] CGRectValue];
tempSubView.frame = toRect;
}];
} completion:^(BOOL finished) {
[tempViewGroup makeObjectsPerformSelector:@selector(removeFromSuperview)];
fromVC.view.alpha = 1.0f;
[self _xw_changeHiddenViewInGroup:startViewGroup hidden:NO];
[self _xw_changeHiddenViewInGroup:endViewGroup hidden:NO];
[transitionContext completeTransition:![transitionContext transitionWasCancelled]];
}];
}
}
/**
* 判断当前控制器的类型，从而找到从出存有移动视图组的控制器
*/
- (UIViewController *)_xw_getRealContainsGroupViewController:(UIViewController *)controller{
UIViewController *realVC = controller;
if ([controller isKindOfClass:[UITabBarController class]]) {
UITabBarController *tabBarVC = (UITabBarController *)realVC;
if ([tabBarVC.selectedViewController isKindOfClass:[UINavigationController class]]) {
UINavigationController *navVC = (UINavigationController *)tabBarVC.selectedViewController;
realVC = navVC.topViewController;
}else{
realVC = tabBarVC.selectedViewController;
}
}
if ([controller isKindOfClass:[UINavigationController class]]) {
UINavigationController *navVC = (UINavigationController *)controller;
realVC = navVC.topViewController;
}
return realVC;
}
- (NSArray *)_xw_getFrameValueFromViewGroup:(NSArray<UIView *> *)group inContainerView:(UIView *)containerView{
NSMutableArray *temp = @[].mutableCopy;
[group enumerateObjectsUsingBlock:^(UIView *view, NSUInteger idx, BOOL * _Nonnull stop) {
CGRect rect = [view convertRect:view.bounds toView:containerView];
[temp addObject:[NSValue valueWithCGRect:rect]];
}];
return temp.copy;
}
- (NSArray<UIView *> *)_xw_makeTempViewGroupWithViewGroup:(NSArray<UIView *> *)group inContainerView:(UIView *)containerView{
NSMutableArray *temp = @[].mutableCopy;
[group enumerateObjectsUsingBlock:^(UIView *view, NSUInteger idx, BOOL * _Nonnull stop) {
UIView *tempView = [self _xw_snapshotView:view];
tempView.frame = [view convertRect:view.bounds toView:containerView];
[containerView addSubview:tempView];
[temp addObject:tempView];
}];
return temp.copy;
}
- (void)_xw_changeHiddenViewInGroup:(NSArray<UIView *> *)group hidden:(BOOL)flag{
[group enumerateObjectsUsingBlock:^(UIView * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
obj.hidden = flag;
}];
}
- (UIView *)_xw_snapshotView:(UIView *)view{
CALayer *layer = view.layer;
UIView *snapView = [UIView new];
snapView.frame = view.frame;
BOOL imgMode = [objc_getAssociatedObject(view, &kXWMagicMovePropertyInViewKey) boolValue] || _imageMode;
UIImage *img = nil;
if (imgMode) {//如果开启imgMode，优先直接获取图片，避免截图时时从小到大造成的模糊
if ([view isKindOfClass:[UIImageView class]]) {//取imageView中的image
img = [(UIImageView *)view image];
}else if ([view isKindOfClass:[UIButton class]]){//取button中的image
img = [(UIButton *)view currentImage];
}
if (!img && [view isKindOfClass:[UIView class]]) {//没取到尝试取content
img = [UIImage imageWithCGImage:(__bridge CGImageRef)view.layer.contents];
}
}
//若都没有取到，则截图
if (!img) {
UIGraphicsBeginImageContextWithOptions(layer.bounds.size, layer.opaque, 0);
CGContextRef context = UIGraphicsGetCurrentContext();
[layer renderInContext:context];
img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
}
snapView.layer.contents = (__bridge id)img.CGImage;
return snapView;
}
@end
NSString *const kXWMagicMoveAnimatorStartViewVCKey = @"kXWMagicMoveAnimatorStartViewVCKey";
NSString *const kXWMagicMoveAnimatorEndViewVCKey = @"kXWMagicMoveAnimatorEndViewVCKey";