iOS 自定义转场动画

作者: 且行且珍惜_iOS | 来源:发表于2018-04-23 15:37 被阅读263次
    自定义转场动画集锦.gif

    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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      网友评论

      • 83fbea52fbe9:self.navigationController.delegate = nil; 应该写在viewWillDisappear里,不然代理取消不掉进入转场2再进入转场5会崩掉
        且行且珍惜_iOS:@闰土GG 1685527540
        83fbea52fbe9:@且行且珍惜_iOS 楼主留个QQ,有个问题请教一下
        且行且珍惜_iOS:@闰土GG 恩恩,好的,已改,谢谢告知😁😀
      • 随行的羊:希望关注 “iOS开发知识小集” 的专题哈,谢谢:smile:

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