Dismiss
效果：
接著使用上一個(gè)代碼
http://www.itdecent.cn/p/009f77cab231
1、新建PresentTransition繼承NSObject，并在.h中遵守UIViewControllerAnimatedTransitioning協(xié)議。
2、實(shí)現(xiàn)協(xié)議的兩個(gè)方法，并在其中編寫 Push 的動(dòng)畫。類似Present，只需要修改少量代碼：
// 返回動(dòng)畫的時(shí)間
- (NSTimeInterval)transitionDuration:(nullable id <UIViewControllerContextTransitioning>)transitionContext{
return 0.8;
}
- (void)animateTransition:(id <UIViewControllerContextTransitioning>)transitionContext{
ViewController * fromVC = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
SecondViewController * toVC = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
UIView * container = [transitionContext containerView];
[container addSubview:toVC.view];
[container bringSubviewToFront:fromVC.view];
// 改變m34
CATransform3D transfrom = CATransform3DIdentity;
transfrom.m34 = -0.002;
container.layer.sublayerTransform = transfrom;
// 設(shè)置archPoint和position
CGRect initalFrame = [transitionContext initialFrameForViewController:fromVC];
toVC.view.frame = initalFrame;
fromVC.view.frame = initalFrame;
fromVC.view.layer.anchorPoint = CGPointMake(0, 0.5);
fromVC.view.layer.position = CGPointMake(0, initalFrame.size.height / 2.0);
// 添加陰影效果
CAGradientLayer * shadowLayer = [[CAGradientLayer alloc] init];
shadowLayer.colors =@[
[UIColor colorWithWhite:0 alpha:1],
[UIColor colorWithWhite:0 alpha:0.5],
[UIColor colorWithWhite:1 alpha:0.5]
];
shadowLayer.startPoint = CGPointMake(0, 0.5);
shadowLayer.endPoint = CGPointMake(1, 0.5);
shadowLayer.frame = initalFrame;
UIView * shadow = [[UIView alloc] initWithFrame:initalFrame];
shadow.backgroundColor = [UIColor clearColor];
[shadow.layer addSublayer:shadowLayer];
[fromVC.view addSubview:shadow];
shadow.alpha = 0;
// 動(dòng)畫
[UIView animateKeyframesWithDuration:[self transitionDuration:transitionContext] delay:0 options:2 animations:^{
fromVC.view.layer.transform = CATransform3DMakeRotation(-M_PI_2, 0, 1, 0);
shadow.alpha = 1.0;
} completion:^(BOOL finished) {
fromVC.view.layer.anchorPoint = CGPointMake(0.5, 0.5);
fromVC.view.layer.position = CGPointMake(CGRectGetMidX(initalFrame), CGRectGetMidY(initalFrame));
fromVC.view.layer.transform = CATransform3DIdentity;
[shadow removeFromSuperview];
[transitionContext completeTransition: ![transitionContext transitionWasCancelled]]; // 如果參數(shù)寫成yes，當(dāng)用戶取消pop時(shí)，會(huì)繼續(xù)執(zhí)行動(dòng)畫，也就是讓detailVC消失，設(shè)置成這個(gè)參數(shù)，會(huì)避免這樣的錯(cuò)誤
}];
}
3、在ViewController.m中加入一個(gè)方法即可：
// dismiss動(dòng)畫
- (id<UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed{
return [[DismissTransition alloc] init];
}
加入手勢(shì)驅(qū)動(dòng)
- 想要同時(shí)實(shí)現(xiàn) present 和 dismiss 手勢(shì)，就需要給兩個(gè) viewController.view 添加手勢(shì)。首先在 ViewController 中給自己添加一個(gè)屏幕右邊的手勢(shì)，在init SecondViewController時(shí)給它的view添加一個(gè)屏幕左邊的手勢(shì)，讓它們使用同一個(gè)手勢(shì)監(jiān)聽方法，都交給viewController處理，也就是self
在ViewController中封裝了一個(gè)增加手勢(shì)的方法，參數(shù)為承載手勢(shì)的view和手勢(shì)
// 添加手勢(shì)的方法
-(void)addScreenEdgePanGestureRecognizer:(UIView *)view edges:(UIRectEdge)edges{
UIScreenEdgePanGestureRecognizer * edgePan = [[UIScreenEdgePanGestureRecognizer alloc] initWithTarget:self action:@selector(edgePanGesture:)]; // viewController和SecondViewController的手勢(shì)都由self管理
edgePan.edges = edges;
[view addGestureRecognizer:edgePan];
}
- 在viewDidLoad()和用于present的按鈕的點(diǎn)擊方法中分別加入手勢(shì)：
-(void)viewDidLoad {
[super viewDidLoad];
self.transitioningDelegate = self;
[self addScreenEdgePanGestureRecognizer:self.view edges:UIRectEdgeRight]; // 為self.view增加右側(cè)的手勢(shì)，用于push
}
-(void)presentClick{
SecondViewController * secondVC = [[SecondViewController alloc] init];
secondVC.transitioningDelegate = self; // 必須second同樣設(shè)置delegate才有動(dòng)畫
[self addScreenEdgePanGestureRecognizer:secondVC.view edges:UIRectEdgeLeft];
[self presentViewController:secondVC animated:YES completion:^{
}];
}
- 實(shí)現(xiàn)手勢(shì)的監(jiān)聽方法，首先定義一個(gè)屬性：
@property (nonatomic, retain) UIPercentDrivenInteractiveTransition * percentDrivenTransition;
- 因?yàn)橛袃蓚€(gè)手勢(shì)，要區(qū)別他們使用的是 KeyWindow。手勢(shì)監(jiān)聽方法：
// 手勢(shì)的監(jiān)聽方法
-(void)edgePanGesture:(UIScreenEdgePanGestureRecognizer *)edgePan{
CGFloat progress = fabs([edgePan translationInView:[UIApplication sharedApplication].keyWindow].x / [UIApplication sharedApplication].keyWindow.bounds.size.width);// 有兩個(gè)手勢(shì)，所以這里計(jì)算百分比使用的是 KeyWindow
if(edgePan.state == UIGestureRecognizerStateBegan){
self.percentDrivenTransition = [[UIPercentDrivenInteractiveTransition alloc] init];
if(edgePan.edges == UIRectEdgeRight){
// present，避免重復(fù)，直接調(diào)用點(diǎn)擊方法
[self presentClick];
}else if(edgePan.edges == UIRectEdgeLeft){
[self dismissViewControllerAnimated:YES completion:^{
}];
}
}else if(edgePan.state == UIGestureRecognizerStateChanged){
[self.percentDrivenTransition updateInteractiveTransition:progress];
}else if(edgePan.state == UIGestureRecognizerStateCancelled || edgePan.state == UIGestureRecognizerStateEnded){
if(progress > 0.5){
[_percentDrivenTransition finishInteractiveTransition];
}else{
[_percentDrivenTransition cancelInteractiveTransition];
}
_percentDrivenTransition = nil;
}
}
5.最后實(shí)現(xiàn) UIViewControllerTransitioningDelegate 協(xié)議的另外兩個(gè)方法，分別返回 Present 和 Dismiss 動(dòng)畫的百分比。
// 百分比present
-(id<UIViewControllerInteractiveTransitioning>)interactionControllerForPresentation:(id<UIViewControllerAnimatedTransitioning>)animator{
return _percentDrivenTransition;
}
// 百分比dismiss
-(id<UIViewControllerInteractiveTransitioning>)interactionControllerForDismissal:(id<UIViewControllerAnimatedTransitioning>)animator{
return _percentDrivenTransition;
}
現(xiàn)在，關(guān)于Modal的自定義跳轉(zhuǎn)動(dòng)畫就完成了
