OC转场动画UIViewControllerTransitioningDelegate

该项目一共两个界面，第一个的只有一个SystemAnimationViewController只有UICollecitonView，第二个界面ImgDetailViewController只有一个UIImageView，代码简单，这里不做陈述

下面是转场动画的所有代码：

//
//  ModelAnimationDelegate.m
//  Demo
//
//  Created by Apple on 2018/11/8.
//  Copyright © 2018年 cqytjr. All rights reserved.
//

#import "ModelAnimationDelegate.h"
#import "SystemAnimationViewController.h"
#import "SystemAnimaitonCollectionViewCell.h"
#import "ImgDetailViewController.h"
/*
 1.描述ViewController转场的：
 UIViewControllerTransitioningDelegate自定义模态转场动画时使用
 ,UINavigationControllerDelegate  自定义navigation转场动画时使用。,
 UITabBarControllerDelegate  自定义tab转场动画时使用。
 2.定义动画内容的
 UIViewControllerAnimatedTransitioning,UIViewControllerInteractiveTransitioning
 3.表示动画上下文的
 UIViewControllerContextTransitioning
 */
@interface ModelAnimationDelegate ()< UIViewControllerAnimatedTransitioning,UIViewControllerTransitioningDelegate>
 @property (nonatomic, assign) BOOL isPresentAnimationing;
@end

@implementation ModelAnimationDelegate

#pragma mark UIViewControllerAnimatedTransitioning

//  视图弹出
- (void)presentViewAnimation:(id <UIViewControllerContextTransitioning>)transitionContext {

    // 获取容器view
    UIView *containerView = [transitionContext containerView];
    // 获取目标view
    UIView *destinationView = [transitionContext viewForKey:UITransitionContextToViewKey];
    destinationView.alpha = 0;
    // 将目标view添加到容器view
    [containerView addSubview:destinationView];

    // 获取目标vc
    ImgDetailViewController *destinationVC = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
    NSIndexPath *indexPath = destinationVC.indexPath;

    // 获取来源vc
    UINavigationController *naVC = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
    SystemAnimationViewController *sourceVC = (SystemAnimationViewController *)naVC.topViewController;
    // 获取来源view
    UICollectionView *collectionView = sourceVC.collectionView;
    SystemAnimaitonCollectionViewCell *selectedCell = (SystemAnimaitonCollectionViewCell *)[collectionView cellForItemAtIndexPath:indexPath];
    // 获取动画开始位置大小
    CGRect startFrame = [collectionView convertRect:selectedCell.frame toView:[UIApplication sharedApplication].keyWindow];

    UIImageView *animationImgView = [[UIImageView alloc] initWithFrame:startFrame];
    animationImgView.image = selectedCell.img.image;
    animationImgView.contentMode = UIViewContentModeScaleAspectFit;
    animationImgView.clipsToBounds = YES;
    [containerView addSubview:animationImgView];

    // 获取动画结束位置大小
    CGRect endFrame = destinationVC.img.frame;

    // 执行过渡动画
    [UIView animateWithDuration:1.0 animations:^{
        animationImgView.frame = endFrame;
        NSLog(@"-----:%f   %f   %f   %f",startFrame.origin.x,startFrame.origin.y,startFrame.size.width,startFrame.size.height);
        NSLog(@"-----:%f   %f   %f   %f",endFrame.origin.x,endFrame.origin.y,endFrame.size.width,endFrame.size.height);

    } completion:^(BOOL finished) {
        [transitionContext completeTransition:YES];
        [UIView animateWithDuration:1.0 animations:^{
            destinationView.alpha = 1.0;
        } completion:^(BOOL finished) {
            [animationImgView removeFromSuperview];
        }];
    }];

}

//  视图消失
- (void)dismissViewAnimation:(id <UIViewControllerContextTransitioning>)transitionContext {

    // 获取容器view
    UIView *containerView = [transitionContext containerView];
    // 获取目标view
    UIView *destinationView = [transitionContext viewForKey:UITransitionContextToViewKey];
    destinationView.alpha = 0;
    // 将目标view添加到容器view
    [containerView addSubview:destinationView];

    UINavigationController *naVC = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
    // 获取目标vc
    SystemAnimationViewController *destinationVC = naVC.topViewController;
    //         NSIndexPath *indexPath = destinationVC.indexPath;
    //
    // 获取来源vc

    ImgDetailViewController *sourceVC = (ImgDetailViewController *)[transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
    NSIndexPath *indexPath = sourceVC.indexPath;
    // 获取来源view
    UICollectionView *collectionView = destinationVC.collectionView;
    SystemAnimaitonCollectionViewCell *selectedCell = (SystemAnimaitonCollectionViewCell *)[collectionView cellForItemAtIndexPath:indexPath];

    // 获取动画开始位置大小
    CGRect startFrame = sourceVC.img.frame;

    UIImageView *animationImgView = [[UIImageView alloc] initWithFrame:startFrame];
    animationImgView.image = selectedCell.img.image;
    animationImgView.contentMode = UIViewContentModeScaleAspectFill;
    animationImgView.clipsToBounds = YES;
    [containerView addSubview:animationImgView];
    animationImgView.contentMode = UIViewContentModeScaleAspectFit;
    animationImgView.clipsToBounds = YES;

    // 获取动画结束位置大小
    CGRect endFrame =  [collectionView convertRect:selectedCell.frame toView:[UIApplication sharedApplication].keyWindow];

    // 执行过渡动画
    [UIView animateWithDuration:1.0 animations:^{
        animationImgView.frame = endFrame;

        NSLog(@"-----:%f   %f   %f   %f",startFrame.origin.x,startFrame.origin.y,startFrame.size.width,startFrame.size.height);
        NSLog(@"-----:%f   %f   %f   %f",endFrame.origin.x,endFrame.origin.y,endFrame.size.width,endFrame.size.height);
        sourceVC.view.hidden = YES;

    } completion:^(BOOL finished) {
        [transitionContext completeTransition:YES];

    }];
    [UIView animateWithDuration:1.0 animations:^{
        destinationView.alpha = 1.0;

    } completion:^(BOOL finished) {
        [animationImgView removeFromSuperview];
    }];
}

- (NSTimeInterval)transitionDuration:(nullable id <UIViewControllerContextTransitioning>)transitionContext {
    return 10.0;
}

- (void)animateTransition:(id <UIViewControllerContextTransitioning>)transitionContext {
    _isPresentAnimationing ?  [self presentViewAnimation:transitionContext] : [self dismissViewAnimation:transitionContext];

}

#pragma mark UIViewControllerTransitioningDelegate

- (nullable id <UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source {
    _isPresentAnimationing = YES;
    return self;
}

- (nullable id <UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed {
    _isPresentAnimationing = NO;
    return self;

}

@end