iOS7使用代理自定义导航转场动画

如果你已经厌倦了使用UINavigationController进行简单粗暴的push和pop转场操作，你完全可以使用自定义的导航转场效果，iOS7提供了许多漂亮的代理方法帮助你实现各种自定义动画，下面演示一个简单的导航转场动画Demo的实现过程，效果如图一所示：STEP 1： 创建一个项目，其中包含，一个名为FirstViewController和一个SecondViewController的视图控制器，两个继承自NSObject的PopAnimation和PushAnimation类。STEP2：使用UIViewControllerAnimatiedTransitioning代理方法自定义Push 动画 1.）让PopAnimation使用UIViewControllerAnimatedTransitioning代理的方法：@interface PushAnimation : NSObject <UIViewControllerAnimatedTransitioning>

2.）PopAnimation的实现- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext {UIViewController *fromViewController = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];UIViewController *toViewController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];[[transitionContext containerView] addSubview:toViewController.view];toViewController.view.alpha = 0;[UIView animateWithDuration:0.3*[self transitionDuration:transitionContext] animations:^{fromViewController.view.transform = CGAffineTransformMakeScale(0.6, 0.6);toViewController.view.alpha = 0.3;} completion:^(BOOL finished) {[UIView animateWithDuration:0.3*[self transitionDuration:transitionContext] animations:^{fromViewController.view.transform = CGAffineTransformMakeScale(1.1, 1.1);toViewController.view.alpha = 0.6;} completion:^(BOOL finished){[UIView animateWithDuration:0.4*[self transitionDuration:transitionContext] animations:^{fromViewController.view.transform = CGAffineTransformMakeScale(0.1, 0.1);toViewController.view.alpha = 1.0;} completion:^(BOOL finished){fromViewController.view.transform = CGAffineTransformIdentity;[transitionContext completeTransition:![transitionContext transitionWasCancelled]];}];}];}];}- (NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext {return 3.0f;}STEP 3： 使用UIViewControllerAnimatiedTransitioning代理方法自定义Pop 动画@interface PopAnimation : NSObject <UIViewControllerAnimatedTransitioning>

- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext {UIViewController *fromViewController = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];UIViewController *toViewController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];[[transitionContext containerView] addSubview:toViewController.view];toViewController.view.alpha = 0;toViewController.view.transform = CGAffineTransformMakeScale(0.1, 0.1);[UIView animateWithDuration:[self transitionDuration:transitionContext] animations:^{toViewController.view.transform = CGAffineTransformMakeScale(1.0, 1.0);toViewController.view.alpha = 1.0f;fromViewController.view.alpha = 0.0f;} completion:^(BOOL finished) {fromViewController.view.transform = CGAffineTransformIdentity;[transitionContext completeTransition:![transitionContext transitionWasCancelled]];}];}- (NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext {return 3.0f;}

STEP4： 在FirstViewController中实现UINavigationControllerDelegate的一些方法#import "PushAnimation.h"@interface FirstViewController : UIViewController <UINavigationControllerDelegate>@property (nonatomic, strong) PushAnimation *animation;

- (void)viewDidLoad{[super viewDidLoad];_animation = [PushAnimation new];//隐藏NavigationBarself.navigationController.navigationBarHidden = YES;//设置背景图片UIImageView *imageView = [[UIImageView alloc]initWithFrame:self.view.frame];[imageView setImage:[UIImage imageNamed:@"1.jpg"]];[self.view addSubview:imageView];//定义一个buttonUIButton *pushBtn = [UIButton buttonWithType:UIButtonTypeRoundedRect];pushBtn.frame = CGRectMake(284, 700, 200, 40);[pushBtn setTitle:@"push" forState:UIControlStateNormal];pushBtn.titleLabel.font = [UIFont systemFontOfSize:32.0f];[pushBtn addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:pushBtn];}- (void)viewDidAppear:(BOOL)animated {[super viewDidAppear:animated];self.navigationController.delegate = self;}- (void)viewWillDisappear:(BOOL)animated {[super viewWillDisappear:animated];if (self.navigationController.delegate == self) {self.navigationController.delegate = nil;}}- (void)buttonClicked:(id)sender {SecondViewController *presentController = [[SecondViewController alloc]init];[self.navigationController pushViewController:presentController animated:YES];}#pragma mask UINavigationControllerDelegate- (id <UIViewControllerAnimatedTransitioning>)navigationController:(UINavigationController *)navigationControlleranimationControllerForOperation:(UINavigationControllerOperation)operationfromViewController:(UIViewController *)fromVCtoViewController:(UIViewController *)toVC {if (operation == UINavigationControllerOperationPush) {return self.animation;}return nil;}

STEP5： 在SecondViewController中调用PopAnimation动画@interface SecondViewController : UIViewController <UINavigationControllerDelegate>@property(nonatomic, strong) PopAnimation *animation;

- (void)viewDidLoad{[super viewDidLoad];_animation = [PopAnimation new];//隐藏NavigationBarself.navigationController.navigationBarHidden = YES;//设置背景图片UIImageView *imageView = [[UIImageView alloc]initWithFrame:self.view.frame];[imageView setImage:[UIImage imageNamed:@"2.jpg"]];[self.view addSubview:imageView];//定义一个buttonUIButton *pushBtn = [UIButton buttonWithType:UIButtonTypeRoundedRect];pushBtn.frame = CGRectMake(284, 700, 200, 40);[pushBtn setTitle:@"Pop" forState:UIControlStateNormal];pushBtn.titleLabel.font = [UIFont systemFontOfSize:32.0f];[pushBtn addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:pushBtn];}- (void)viewDidAppear:(BOOL)animated {[super viewDidAppear:animated];self.navigationController.delegate = self;}- (void)viewWillDisappear:(BOOL)animated {[super viewWillDisappear:animated];if (self.navigationController.delegate == self) {self.navigationController.delegate = nil;}}- (void)buttonClicked:(id)sender {[self.navigationController popViewControllerAnimated:YES];}#pragma mask UINavigationControllerDelegate- (id <UIViewControllerAnimatedTransitioning>)navigationController:(UINavigationController *)navigationControlleranimationControllerForOperation:(UINavigationControllerOperation)operationfromViewController:(UIViewController *)fromVCtoViewController:(UIViewController *)toVC {if (operation == UINavigationControllerOperationPop) {return self.animation;}return nil;}

STEP6：  Over 了源码下载地址： http://download.csdn.net/detail/luozhonglan/7979545***************************************************************************************************************************************************************************************