转场动画2-Pop动画

上一篇试讲push动画,这篇分解pop动画

里面关于矩阵有不懂得,参考CATransform3D 特效详解

上图(虚拟机下,图是渣渣

)

代码直接上

//
//  PopTransition.h
//  转场动画2-Pop
//
//  Created by MAc on 16/5/28.
//  Copyright © 2016年 李赵杰. All rights reserved.
//
#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
@interface PopTransition : NSObject<UIViewControllerAnimatedTransitioning>
/** 全局上下文  */
@property (nonatomic,strong) id  transitionContext;
/** fromViewController  */
@property (nonatomic,strong) UIViewController * fromViewController;
@end

实现方法和Push里面基本一致

//
//  PopTransition.m
//  转场动画2-Pop
//
//  Created by MAc on 16/5/28.
//  Copyright © 2016年 李赵杰. All rights reserved.
//
#import "PopTransition.h"
@implementation PopTransition
- (NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext{
    return 5.0;
}
- (void)animateTransition:(id <UIViewControllerContextTransitioning>)transitionContext{
    _transitionContext = transitionContext;
    UIViewController * fromViewController = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
    UIViewController * toViewController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
    UIView * containerView = [transitionContext containerView];
    _fromViewController = fromViewController;
    [containerView addSubview:toViewController.view];
    [containerView addSubview:fromViewController.view];
    CATransform3D transform =CATransform3DIdentity;
    //这个值表示:  m34（透视效果，要操作的这个对象要有旋转的角度，否则没有效果。正直/负值都有意义）
    transform.m34 = - 1/1500.0;
    fromViewController.view.layer.transform = transform;
    fromViewController.view.layer.anchorPoint = CGPointMake(1, 0.5);
    fromViewController.view.layer.position =CGPointMake(CGRectGetMaxX(toViewController.view.frame),CGRectGetMidY(toViewController.view.frame));
    CABasicAnimation * animation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.y"];
    animation.duration = [self transitionDuration:transitionContext];
    animation.fromValue = @(0);
    animation.toValue =@(M_PI_2);
    animation.delegate = self;
    [fromViewController.view.layer addAnimation:animation forKey:@"rotateAnimation"];
}
-(void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag{
    if (flag) {
        // This must be called whenever a transition completes (or is cancelled.)
        // Typically this is called by the object conforming to the
        // UIViewControllerAnimatedTransitioning protocol that was vended by the transitioning
        // delegate.  For purely interactive transitions it should be called by the
        // interaction controller. This method effectively updates internal view
        // controller state at the end of the transition.
    //意思就是:必须调用在转场动画结束时(取消),....  最后这个方法有效的更新了试图控制器中转场动画的状态
        [_transitionContext completeTransition:YES];
    }
}
@end

//
//  PopViewController.m
//  转场动画2-Pop
//
//  Created by MAc on 16/5/28.
//  Copyright © 2016年 李赵杰. All rights reserved.
//
#import "PopViewController.h"
#import "PopTransition.h"
@interface PopViewController ()<UINavigationControllerDelegate>
@end
@implementation PopViewController
- (void)viewDidAppear:(BOOL)animated{
    [super viewDidAppear:animated];
    self.navigationController.delegate = self;
}
-(void)viewDidDisappear:(BOOL)animated{
    [super viewDidDisappear:animated];
    self.navigationController.delegate =nil;
}
- (void)viewDidLoad {
    [super viewDidLoad];
      // Do any additional setup after loading the view.
}
- (id<UIViewControllerAnimatedTransitioning>)navigationController:(UINavigationController *)navigationController animationControllerForOperation:(UINavigationControllerOperation)operation fromViewController:(UIViewController *)fromVC toViewController:(UIViewController *)toVC{
    if (operation == UINavigationControllerOperationPop) {
        return [[PopTransition alloc]init];
    }
    return nil;
}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/
@end

demo地址

下一篇解析 吴彦祖的手势,尽请期待