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iOS(视图控制器转场)

时间:2016-12-12 14:18:19      阅读:287      评论:0      收藏:0      [点我收藏+]

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转场需要提供转场代理,不使用默认的代理则需要自己实现代理方式,有UINavigationController、UITabBarController、UIViewController三种代理,实现以下三种协议
<UINavigationControllerDelegate>     //push和pop切换 <UITabBarControllerDelegate>       //tab切换
<UIViewControllerTransitioningDelegate>  //UICollectionViewController 与 UINavigationController 结合的转场方式

转场触发时,需要UIKit 将要求转场代理将提供转场动画的核心构件:动画控制器和交互控制器


动画控制器(Animation Controller):

 最重要的部分,负责添加视图以及执行动画;遵守<UIViewControllerAnimatedTransitioning>协议;由我们实现。

  

 交互控制器

 通过交互手段,通常是手势来驱动动画控制器实现的动画,使得用户能够控制整个过程;遵守<UIViewControllerInteractiveTransitioning>协议;系统已经打包好现成的类供我们使用

 

   转场环境(Transition Context):

   提供转场中需要的数据;遵守<UIViewControllerContextTransitioning>协议;由 UIKit 在转场开始前生成并提供给我们提交的动画控制 器和交互控制器使用。

  

 转场协调器(Transition Coordinator):

可在转场动画发生的同时并行执行其他的动画,其作用与其说协调不如说辅助,主要在 Modal 转场和交互转场取消时使用,其他时候很少用到;遵守<UIViewControllerTransitionCoordinator>协议;由 UIKit 在转场时生成,UIViewController 在 iOS 7 中新增了方法transitionCoordinator()返回一个遵守该协议的对象,且该方法只在该控制器处于转场过程中才返回一个此类对象,不参与转场时返回 nil

动画控制器协议实现:
 
 

//返回动画时间


- (NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext {


    


    return self.duration;


}


 


//执行动画


- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext {


    //返回容器视图,转场发生的地方


    //获取参与转场的视图控制器,有 UITransitionContextFromViewControllerKey UITransitionContextToViewControllerKey 两个 Key


    //通过viewForKey:获取的视图是viewControllerForKey:返回的控制器的根视图,或者 nilviewForKey:方法返回 nil 只有一种情况: UIModalPresentationCustom 模式下的 Modal 转场 ,通过此方法获取 presentingView 时得到的将是 nil,在后面的 Modal 转场里会详细解释。


    UIViewController *fromVC = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];


    UIViewController *toVC = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];


    UIView *toView = toVC.view;


    UIView *fromView = fromVC.view;


    


    [self animateTransition:transitionContext fromVC:fromVC toVC:toVC fromView:fromView toView:toView];


}


- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext fromVC:(UIViewController *)fromVC toVC:(UIViewController *)toVC fromView:(UIView *)fromView toView:(UIView *)toView {

    

    // Add the toView to the container

    UIView* containerView = [transitionContext containerView];

    [containerView addSubview:toView];

    [containerView sendSubviewToBack:toView];

    

    CGSize size = toView.frame.size;

    

    NSMutableArray *snapshots = [NSMutableArray new];

    

    CGFloat xFactor = 10.0f;

    CGFloat yFactor = xFactor * size.height / size.width;

    

    // snapshot the from view, this makes subsequent snaphots more performant

    UIView *fromViewSnapshot = [fromView snapshotViewAfterScreenUpdates:NO];

    

    // create a snapshot for each of the exploding pieces

    for (CGFloat x=0; x < size.width; x+= size.width / xFactor) {

        for (CGFloat y=0; y < size.height; y+= size.height / yFactor) {

            CGRect snapshotRegion = CGRectMake(x, y, size.width / xFactor, size.height / yFactor);

            UIView *snapshot = [fromViewSnapshot resizableSnapshotViewFromRect:snapshotRegion  afterScreenUpdates:NO withCapInsets:UIEdgeInsetsZero];

            snapshot.frame = snapshotRegion;

            [containerView addSubview:snapshot];

            [snapshots addObject:snapshot];

        }

    }

    

    [containerView sendSubviewToBack:fromView];

    

    // animate

    NSTimeInterval duration = [self transitionDuration:transitionContext];

    [UIView animateWithDuration:duration animations:^{

        for (UIView *view in snapshots) {

            CGFloat xOffset = [self randomFloatBetween:-100.0 and:100.0];

            CGFloat yOffset = [self randomFloatBetween:-100.0 and:100.0];

            view.frame = CGRectOffset(view.frame, xOffset, yOffset);

            view.alpha = 0.0;

            view.transform = CGAffineTransformScale(CGAffineTransformMakeRotation([self randomFloatBetween:-10.0 and:10.0]), 0.01, 0.01);

        }

    } completion:^(BOOL finished) {

        for (UIView *view in snapshots) {

            [view removeFromSuperview];

        }

        [transitionContext completeTransition:![transitionContext transitionWasCancelled]];

    }];

    

}

 

- (float)randomFloatBetween:(float)smallNumber and:(float)bigNumber {

    float diff = bigNumber - smallNumber;

    return (((float) (arc4random() % ((unsigned)RAND_MAX + 1)) / RAND_MAX) * diff) + smallNumber;

}

 

 

参考链接:http://blog.devtang.com/2016/03/13/iOS-transition-guide/


  

iOS(视图控制器转场)

标签:获取   协议   creat   off   height   数据   resizable   fork   blank   

原文地址:http://www.cnblogs.com/air-liyan/p/6164021.html

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