成功版的从左到右的Push动画

通过实现UINavigationControllerDelegate,自定义转场动画 1.创建一个Pushtransition

#import 
    
     @interface PushTransition : NSObject@property(nonatomic,strong) id
     
      transitionContext;@end复制代码
     
    

.m文件

#import 
    
     #import 
     
      #import "PushTransition.h"@interface PushTransition ()
      
       @end@implementation PushTransition- (NSTimeInterval)transitionDuration:(nullable id 
       
        )transitionContext{    return 0.3f;}// This method can only  be a nop if the transition is interactive and not a percentDriven interactive transition.- (void)animateTransition:(id 
        
         )transitionContext{    self.transitionContext = transitionContext;    UIViewController *fromVC = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];    UIViewController *toVC = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];    //不添加的话，屏幕什么都没有    UIView *containerView = [transitionContext containerView];    [containerView addSubview:fromVC.view];    [containerView addSubview:toVC.view];    CABasicAnimation *maskAnimation = [CABasicAnimation animationWithKeyPath:@"position.x"];    maskAnimation.fromValue = @(-toVC.view.frame.size.width/2.0);    maskAnimation.toValue = @(toVC.view.frame.size.width/2.0);    maskAnimation.duration = [self     transitionDuration:transitionContext];    maskAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];    maskAnimation.fillMode = kCAFillModeForwards;    maskAnimation.removedOnCompletion = NO;    maskAnimation.delegate = self;    [toVC.view.layer addAnimation:maskAnimation forKey:@"position"];}- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag{    [self.transitionContext completeTransition:![self.transitionContext transitionWasCancelled]];    //去除mask    [self.transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey].view.layer.mask = nil;    [self.transitionContext viewControllerForKey:UITransitionContextToViewControllerKey].view.layer.mask = nil;}@end复制代码
        
       
      
     
    

2.设置navcontroller 代理

- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.    self.view.backgroundColor = [UIColor redColor];    self.navigationController.delegate = self;}复制代码

3.在viewcontroller实现代理

#pragma mark -UINavigationControllerDelegate- (id
    
     )navigationController:(UINavigationController *)navigationController animationControllerForOperation:(UINavigationControllerOperation)operation fromViewController:(UIViewController *)fromVC toViewController:(UIViewController *)toVC{    if (operation == UINavigationControllerOperationPush) {        //返回我们自定义的效果        return (id)[[PushTransition alloc]init];    }    return nil;}复制代码
    

4.push跳转

- (IBAction)pushTransition:(id)sender {    SecondViewController *secondCtl = [self.storyboard instantiateViewControllerWithIdentifier:@"SecondViewController"];    [self.navigationController pushViewController:secondCtl animated:YES];}复制代码

4.FAQ 此处有坑请小心,transition中的animationDidStop必须要有,否则你会发现所有的事件都响应不了.

- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag{    [self.transitionContext completeTransition:![self.transitionContext transitionWasCancelled]];    //去除mask    [self.transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey].view.layer.mask = nil;    [self.transitionContext viewControllerForKey:UITransitionContextToViewControllerKey].view.layer.mask = nil;}复制代码