本文记录分享下自定义转场动画的实现方法,具体到动画效果:新浪微博图集浏览转场效果、手势过渡动画、网易音乐启动屏转场动画、开关门动画、全屏侧滑返回效果 的代码可以到Github WSLTransferAnimation下载查看,注释还算清晰。
模态化present和dismiss 自定义转场
1、创建一个遵循<UIViewControllerAnimatedTransitioning>协议的动画过渡管理对象,并实现如下两个方法:
//返回动画事件
- (NSTimeInterval)transitionDuration:(nullable id <UIViewControllerContextTransitioning>)transitionContext{
return 0.3;
}
//所有的过渡动画事务都在这个方法里面完成
- (void)animateTransition:(id <UIViewControllerContextTransitioning>)transitionContext{
//取出转场前后的视图控制器
UIViewController * fromVC = (UIViewController *)[transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
UIViewController * toVC = (UIViewController *)[transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
//取出转场前后视图控制器上的视图view
UIView * toView = [transitionContext viewForKey:UITransitionContextToViewKey];
UIView * fromView = [transitionContext viewForKey:UITransitionContextFromViewKey];
//这里有个重要的概念containerView,要做转场动画的视图就必须要加入containerView上才能进行,可以理解containerView管理着所有做转场动画的视图
UIView *containerView = [transitionContext containerView];
//如果加入了手势交互转场,就需要根据手势交互动作是否完成/取消来做操作,完成标记YES,取消标记NO,必须标记,否则系统认为还处于动画过程中,会出现无法交互之类的bug
[transitionContext completeTransition:![transitionContext transitionWasCancelled]];
if ([transitionContext transitionWasCancelled]) {
//如果取消转场
}else{
//完成转场
}
}
2、自定义一个继承于UIPercentDrivenInteractiveTransition的手势过渡管理对象,可以根据手势需要设置控制动画转场进度的百分比。
//必要调用实现的系统方法
//手势过程中,通过updateInteractiveTransition设置转场过程动画进行的百分比,然后系统会根据百分比自动布局动画控件,不用我们控制了
[self updateInteractiveTransition:percentComplete];
//完成转场操作
[self finishInteractiveTransition];
//取消转场操作
[self cancelInteractiveTransition];
3、转场时最上层的视图控制器需要遵循<UIViewControllerTransitioningDelegate>的协议,并设置为代理,并实现如下代理方法:
//设置转场代理
self.transitioningDelegate = self;
#pragma mark -- UIViewControllerTransitioningDelegate
//返回一个处理present动画过渡的对象
-(id<UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source{
return self.transitionAnimation;
}
//返回一个处理dismiss动画过渡的对象
- (id<UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed{
//这里我们初始化dismissType
self.transitionAnimation.transitionType = WSLTransitionOneTypeDissmiss;
return self.transitionAnimation;
}
//返回一个处理present手势过渡的对象
- (nullable id <UIViewControllerInteractiveTransitioning>)interactionControllerForPresentation:(id <UIViewControllerAnimatedTransitioning>)animator{
return self.transitionInteractive;
}
//返回一个处理dismiss手势过渡的对象
- (nullable id <UIViewControllerInteractiveTransitioning>)interactionControllerForDismissal:(id <UIViewControllerAnimatedTransitioning>)animator{
return self.transitionInteractive;
}
导航控制器push和pop 自定义转场
1、略...同上
2、略... 同上
3、在push动画之前设置导航控制器的转场动画代理,转场时最上层的视图控制器需要遵循<UINavigationControllerDelegate>的协议,并设置为代理,并实现如下代理方法:
//在push动画之前设置转场动画代理
self.navigationController.delegate = animationFour;
#pragma mark -- UINavigationControllerDelegate
//返回处理push/pop动画过渡的对象
- (nullable id <UIViewControllerAnimatedTransitioning>)navigationController:(UINavigationController *)navigationController
animationControllerForOperation:(UINavigationControllerOperation)operation
fromViewController:(UIViewController *)fromVC
toViewController:(UIViewController *)toVC{
if (operation == UINavigationControllerOperationPush) {
self.transitionAnimation.transitionType = WSLTransitionTwoTypePush;
return self.transitionAnimation;
}else if (operation == UINavigationControllerOperationPop){
self.transitionAnimation.transitionType = WSLTransitionTwoTypePop;
}
return self.transitionAnimation;
}
//返回处理push/pop手势过渡的对象 这个代理方法依赖于上方的方法 ,这个代理实际上是根据交互百分比来控制上方的动画过程百分比
- (nullable id <UIViewControllerInteractiveTransitioning>)navigationController:(UINavigationController *)navigationController
interactionControllerForAnimationController:(id <UIViewControllerAnimatedTransitioning>) animationController{
//手势开始的时候才需要传入手势过渡代理,如果直接pop或push,应该返回nil,否者无法正常完成pop/push动作
if ( self.transitionAnimation.transitionType == WSLTransitionTwoTypePop) {
return self.transitionInteractive.isInteractive == YES ? self.transitionInteractive : nil;
}
return nil;
}
全屏侧滑返回
创建一个继承于UINavigationController的一个对象WSLNavigatioController,遵守协议<UIGestureRecognizerDelegate>,实现如下方法:
// 获取系统自带滑动手势的target对象
id target = self.interactivePopGestureRecognizer.delegate;
// 创建全屏滑动手势,调用系统自带滑动手势的target的action方法
UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:target action:@selector(handleNavigationTransition:)];
// 设置手势代理,拦截手势触发
pan.delegate = self;
// 给导航控制器的view添加全屏滑动手势
[self.view addGestureRecognizer:pan];
// 禁止使用系统自带的滑动手势
self.interactivePopGestureRecognizer.enabled = NO;
#pragma mark -- UIGestureRecognizerDelegate
// 什么时候调用:每次触发手势之前都会询问下代理,是否触发。
// 作用:拦截手势触发
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer
{
// 注意:只有非根控制器才有滑动返回功能,根控制器没有。
// 判断导航控制器是否只有一个子控制器,如果只有一个子控制器,肯定是根控制器
if (self.childViewControllers.count == 1) {
// 表示用户在根控制器界面,就不需要触发滑动手势,
return NO;
}
return YES;
}
解决UIScrollView的滑动手势与全屏侧滑手势的冲突
创建一个UIScrollView的类别UIScrollView+GestureConflict,重写如下方法:
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
// 首先判断otherGestureRecognizer是不是系统pop手势
if ([otherGestureRecognizer.view isKindOfClass:NSClassFromString(@"UILayoutContainerView")]) {
// 再判断系统手势的state是began还是fail,同时判断scrollView的位置是不是正好在最左边
if (otherGestureRecognizer.state == UIGestureRecognizerStateBegan && self.contentOffset.x == 0) {
return YES;
}
}
return NO;
}
学习文章:
https://www.jianshu.com/p/45434f73019e
http://www.cocoachina.com/ios/20150811/12897.html
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