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iOS7之定制View Controller切换效果
在iOS5和iOS6前,View Controller的切换主要有4种:
- 1. Push/Pop,NavigationViewController常干的事儿
- 2. Tab,TabViewController点击
- 3. Present Modal,调用ViewController的presentViewController:animated:completion:方法
- 4. Add ChildViewController,调用- (void)addChildViewController:(UIViewController *)childController方法
在使用Add ChildViewController的方式时,一般使用transitionFromViewController:toViewController:…的Animation block中可以实现一些简单的切换效果,这样做有2大不足:
- 1. 代码高度耦合,VC切换部分的代码直接写在container中,难以分离重用;
- 2. 支持的切换效果比较有限,因为其只能使用UIView动画来切换,管理起来也略显麻烦
于是,苹果在iOS7中引入了一些新的API来帮助开发者更容易,更松耦合地定义ViewController的转换效果。
知识点
用法 从上面的知识点图中可以看出,新的API主要提供了2种VC切换的方式,一种是动画式切换,即定义一种从一个VC到另一个VC的动画效果,切换的时候自动播放,第二种是交互式切换,这种方式同样需要定义动画效果,只是这个动画效果会根据跟随交互式手势来切换VC并同时播放动画效果。 这两种方式的用法略有不同。
动画式切换
- 首先定义一个动画类实现接口UIViewControllerAnimatedTransitioning, 实现接口的2个方法,一个是动画效果的时间,一个是动画效果(- (void)animateTransition:(id )transitionContext ),实现动画效果时可以从参数transitionContext中获取到切换时的上下文信息,比方说从哪个VC切换到哪个VC等。
- 在需切换的VC中实现UIViewControllerTransitioningDelegate,并实现animationController*方法,返回一个步骤1定义的动画变量。
- 调用展现VC切换方法,presentViewController等。
交互式切换
- 定义一个类实现接口UIViewControllerInteractiveTransitioning,iOS7提供了一个默认的基于百分比的动画实现UIPercentDrivenInteractiveTransition,大家不想太麻烦可以直接扩展这个类。该类需要绑定需要实现手势控制的VC,同时把手势操作添加到该VC上,然后在处理手势动作的时候,调用接口中的方法去更新当前的动画进度。
- 定以切换时的动画效果类。和动画式切换的方式一致
- 在需切换的VC中实现UIViewControllerTransitioningDelegate,实现interactiveController方法,返回步骤1定义的类,实现animationController方法返回步骤2定义的动画效果。
实战 下图是我实现的一个VC切换的效果图,(注:App图片是网上随便找的,不代表个人喜好:)
实现代码: VC跳入动画的代码:
Object-c代码
- -(NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext
- {
- return 0.5f;
- }
- -(void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext
- {
- //Create the differents 3D animations
- CATransform3D viewFromTransform;
- CATransform3D viewToTransform;
- UIView *generalContentView = [transitionContext containerView];
- UIView *fromView = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey].view;
- UIView *toView = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey].view;
- viewFromTransform = CATransform3DMakeRotation(ROTATION_ANGLE, 0.0, 1.0, 0.0);
- viewToTransform = CATransform3DMakeRotation(-ROTATION_ANGLE, 0.0, 1.0, 0.0);
- [toView.layer setAnchorPoint:CGPointMake(0, 0.5)];
- [fromView.layer setAnchorPoint:CGPointMake(1, 0.5)];
- // [generalContentView setTransform:CGAffineTransformMakeTranslation(generalContentView.frame.size.width/2.0, 0)];
- viewFromTransform.m34 = PERSPECTIVE;
- viewToTransform.m34 = PERSPECTIVE;
- toView.layer.transform = viewToTransform;
- //Add the to- view
- [generalContentView addSubview:toView];
- [UIView animateWithDuration:[self transitionDuration:transitionContext] animations:^{
- [generalContentView setTransform:CGAffineTransformMakeTranslation(-generalContentView.frame.size.width/2.0, 0)];
- fromView.layer.transform = viewFromTransform;
- toView.layer.transform = CATransform3DIdentity;
- } completion:^(BOOL finished) {
- //Set the final position of every elements transformed
- [generalContentView setTransform:CGAffineTransformIdentity];
- fromView.layer.transform = CATransform3DIdentity;
- toView.layer.transform = CATransform3DIdentity;
- [fromView.layer setAnchorPoint:CGPointMake(0.5f, 0.5f)];
- [toView.layer setAnchorPoint:CGPointMake(0.5f, 0.5f)];
- if ([transitionContext transitionWasCancelled]) {
- [toView removeFromSuperview];
- } else {
- [fromView removeFromSuperview];
- }
- // inform the context of completion
- [transitionContext completeTransition:![transitionContext transitionWasCancelled]];
- }];
- }
-(NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext{ return 0.5f;}-(void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext{ //Create the differents 3D animations CATransform3D viewFromTransform; CATransform3D viewToTransform; UIView *generalContentView = [transitionContext containerView]; UIView *fromView = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey].view; UIView *toView = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey].view; viewFromTransform = CATransform3DMakeRotation(ROTATION_ANGLE, 0.0, 1.0, 0.0); viewToTransform = CATransform3DMakeRotation(-ROTATION_ANGLE, 0.0, 1.0, 0.0); [toView.layer setAnchorPoint:CGPointMake(0, 0.5)]; [fromView.layer setAnchorPoint:CGPointMake(1, 0.5)]; // [generalContentView setTransform:CGAffineTransformMakeTranslation(generalContentView.frame.size.width/2.0, 0)]; viewFromTransform.m34 = PERSPECTIVE; viewToTransform.m34 = PERSPECTIVE; toView.layer.transform = viewToTransform; //Add the to- view [generalContentView addSubview:toView]; [UIView animateWithDuration:[self transitionDuration:transitionContext] animations:^{ [generalContentView setTransform:CGAffineTransformMakeTranslation(-generalContentView.frame.size.width/2.0, 0)]; fromView.layer.transform = viewFromTransform; toView.layer.transform = CATransform3DIdentity; } completion:^(BOOL finished) { //Set the final position of every elements transformed [generalContentView setTransform:CGAffineTransformIdentity]; fromView.layer.transform = CATransform3DIdentity; toView.layer.transform = CATransform3DIdentity; [fromView.layer setAnchorPoint:CGPointMake(0.5f, 0.5f)]; [toView.layer setAnchorPoint:CGPointMake(0.5f, 0.5f)]; if ([transitionContext transitionWasCancelled]) { [toView removeFromSuperview]; } else { [fromView removeFromSuperview]; } // inform the context of completion [transitionContext completeTransition:![transitionContext transitionWasCancelled]]; }];}
手势交互代码:
Object-c代码
- -(void)wireToViewController:(UIViewController *)viewController
- {
- self.presentingVC = viewController;
- [self prepareGestureRecognizerInView:viewController.view];
- }
- - (void)prepareGestureRecognizerInView:(UIView*)view {
- UIPanGestureRecognizer *gesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handleGesture:)];
- [view addGestureRecognizer:gesture];
- }
- -(CGFloat)completionSpeed
- {
- return 1 - self.percentComplete;
- }
- - (void)handleGesture:(UIPanGestureRecognizer *)gestureRecognizer {
- CGPoint translation = [gestureRecognizer translationInView:gestureRecognizer.view.superview];
- switch (gestureRecognizer.state) {
- case UIGestureRecognizerStateBegan:
- // 1. Mark the interacting flag. Used when supplying it in delegate.
- self.interacting = YES;
- [self.presentingVC dismissViewControllerAnimated:YES completion:nil];
- break;
- case UIGestureRecognizerStateChanged: {
- // 2. Calculate the percentage of guesture
- CGFloat fraction = -translation.x / 300.0;
- //Limit it between 0 and 1
- fraction = fminf(fmaxf(fraction, 0.0), 1.0);
- self.shouldComplete = (fraction > 0.5);
- [self updateInteractiveTransition:fraction];
- break;
- }
- case UIGestureRecognizerStateEnded:
- case UIGestureRecognizerStateCancelled: {
- // 3. Gesture over. Check if the transition should happen or not
- self.interacting = NO;
- if (!self.shouldComplete || gestureRecognizer.state == UIGestureRecognizerStateCancelled) {
- [self cancelInteractiveTransition];
- } else {
- [self finishInteractiveTransition];
- }
- break;
- }
- default:
- break;
- }
- }
-(void)wireToViewController:(UIViewController *)viewController{ self.presentingVC = viewController; [self prepareGestureRecognizerInView:viewController.view];}- (void)prepareGestureRecognizerInView:(UIView*)view { UIPanGestureRecognizer *gesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handleGesture:)]; [view addGestureRecognizer:gesture];}-(CGFloat)completionSpeed{ return 1 - self.percentComplete;}- (void)handleGesture:(UIPanGestureRecognizer *)gestureRecognizer { CGPoint translation = [gestureRecognizer translationInView:gestureRecognizer.view.superview]; switch (gestureRecognizer.state) { case UIGestureRecognizerStateBegan: // 1. Mark the interacting flag. Used when supplying it in delegate. self.interacting = YES; [self.presentingVC dismissViewControllerAnimated:YES completion:nil]; break; case UIGestureRecognizerStateChanged: { // 2. Calculate the percentage of guesture CGFloat fraction = -translation.x / 300.0; //Limit it between 0 and 1 fraction = fminf(fmaxf(fraction, 0.0), 1.0); self.shouldComplete = (fraction > 0.5); [self updateInteractiveTransition:fraction]; break; } case UIGestureRecognizerStateEnded: case UIGestureRecognizerStateCancelled: { // 3. Gesture over. Check if the transition should happen or not self.interacting = NO; if (!self.shouldComplete || gestureRecognizer.state == UIGestureRecognizerStateCancelled) { [self cancelInteractiveTransition]; } else { [self finishInteractiveTransition]; } break; } default: break; }}
根据手势3D切换的动画代码:
Object-c代码
- -(NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext
- {
- return 0.5f;
- }
- -(void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext
- {
- //Create the differents 3D animations
- CATransform3D viewFromTransform;
- CATransform3D viewToTransform;
- UIView *generalContentView = [transitionContext containerView];
- UIView *fromView = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey].view;
- UIView *toView = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey].view;
- viewFromTransform = CATransform3DMakeRotation(ROTATION_ANGLE, 0.0, 1.0, 0.0);
- viewToTransform = CATransform3DMakeRotation(-ROTATION_ANGLE, 0.0, 1.0, 0.0);
- [toView.layer setAnchorPoint:CGPointMake(0, 0.5)];
- [fromView.layer setAnchorPoint:CGPointMake(1, 0.5)];
- // [generalContentView setTransform:CGAffineTransformMakeTranslation(generalContentView.frame.size.width/2.0, 0)];
- viewFromTransform.m34 = PERSPECTIVE;
- viewToTransform.m34 = PERSPECTIVE;
- toView.layer.transform = viewToTransform;
- //Add the to- view
- [generalContentView addSubview:toView];
- [UIView animateWithDuration:[self transitionDuration:transitionContext] animations:^{
- [generalContentView setTransform:CGAffineTransformMakeTranslation(-generalContentView.frame.size.width/2.0, 0)];
- fromView.layer.transform = viewFromTransform;
- toView.layer.transform = CATransform3DIdentity;
- } completion:^(BOOL finished) {
- //Set the final position of every elements transformed
- [generalContentView setTransform:CGAffineTransformIdentity];
- fromView.layer.transform = CATransform3DIdentity;
- toView.layer.transform = CATransform3DIdentity;
- [fromView.layer setAnchorPoint:CGPointMake(0.5f, 0.5f)];
- [toView.layer setAnchorPoint:CGPointMake(0.5f, 0.5f)];
- if ([transitionContext transitionWasCancelled]) {
- [toView removeFromSuperview];
- } else {
- [fromView removeFromSuperview];
- }
- // inform the context of completion
- [transitionContext completeTransition:![transitionContext transitionWasCancelled]];
- }];
- }
-(NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext{ return 0.5f;}-(void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext{ //Create the differents 3D animations CATransform3D viewFromTransform; CATransform3D viewToTransform; UIView *generalContentView = [transitionContext containerView]; UIView *fromView = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey].view; UIView *toView = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey].view; viewFromTransform = CATransform3DMakeRotation(ROTATION_ANGLE, 0.0, 1.0, 0.0); viewToTransform = CATransform3DMakeRotation(-ROTATION_ANGLE, 0.0, 1.0, 0.0); [toView.layer setAnchorPoint:CGPointMake(0, 0.5)]; [fromView.layer setAnchorPoint:CGPointMake(1, 0.5)]; // [generalContentView setTransform:CGAffineTransformMakeTranslation(generalContentView.frame.size.width/2.0, 0)]; viewFromTransform.m34 = PERSPECTIVE; viewToTransform.m34 = PERSPECTIVE; toView.layer.transform = viewToTransform; //Add the to- view [generalContentView addSubview:toView]; [UIView animateWithDuration:[self transitionDuration:transitionContext] animations:^{ [generalContentView setTransform:CGAffineTransformMakeTranslation(-generalContentView.frame.size.width/2.0, 0)]; fromView.layer.transform = viewFromTransform; toView.layer.transform = CATransform3DIdentity; } completion:^(BOOL finished) { //Set the final position of every elements transformed [generalContentView setTransform:CGAffineTransformIdentity]; fromView.layer.transform = CATransform3DIdentity; toView.layer.transform = CATransform3DIdentity; [fromView.layer setAnchorPoint:CGPointMake(0.5f, 0.5f)]; [toView.layer setAnchorPoint:CGPointMake(0.5f, 0.5f)]; if ([transitionContext transitionWasCancelled]) { [toView removeFromSuperview]; } else { [fromView removeFromSuperview]; } // inform the context of completion [transitionContext completeTransition:![transitionContext transitionWasCancelled]]; }];}
待切换的VC的动画效果配置代码:
Object-c代码
- -(IBAction)changeViewController:(id)sender
- {
- ToViewController *vc =[[ToViewController alloc] init];
- vc.delegate = self;
- vc.transitioningDelegate = self;
- [self.interactionAnimation wireToViewController:vc];
- [self presentViewController:vc animated:YES completion:nil];
- }
- -(void) didClickedDismissButton:(ToViewController *)viewController
- {
- [self dismissViewControllerAnimated:YES completion:nil];
- }
- - (id <UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source
- {
- return self.presentAnimation;
- }
- -(id <UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed
- {
- return self.cubeAnimation;
- }
- -(id <UIViewControllerInteractiveTransitioning>)interactionControllerForDismissal:(id<UIViewControllerAnimatedTransitioning>)animator
- {
- return self.interactionAnimation.interacting? self.interactionAnimation:nil;
- }
-(IBAction)changeViewController:(id)sender{ ToViewController *vc =[[ToViewController alloc] init]; vc.delegate = self; vc.transitioningDelegate = self; [self.interactionAnimation wireToViewController:vc]; [self presentViewController:vc animated:YES completion:nil];}-(void) didClickedDismissButton:(ToViewController *)viewController{ [self dismissViewControllerAnimated:YES completion:nil];}- (id <UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source{ return self.presentAnimation;}-(id <UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed{ return self.cubeAnimation;}-(id <UIViewControllerInteractiveTransitioning>)interactionControllerForDismissal:(id<UIViewControllerAnimatedTransitioning>)animator{ return self.interactionAnimation.interacting? self.interactionAnimation:nil;}
整个示例的完整代码已提交到Github上:https://github.com/xianlinbox/iOS7_New/tree/master/iOS7_New/VCTransitions
iOS7之定制View Controller切换效果
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