1. 动画效果

demo链接：https://github.com/jiangbin1993/pockerRotateAnimation.git

animation.gif

2. 实现原理

实现原理就是创建三个扑克牌pockerView , 先在扑克牌上添加一个imageview，作为牌的背面。然后实现翻转动画，在翻转的时候将imageview移除，添加另一个imageview作为正面。

3. 核心代码：

方法一： 翻转动画，内部实现还是方法二

+ (void)transitionWithView:(UIView *)view duration:(NSTimeInterval)duration options:(UIViewAnimationOptions)options animations:(void (^ __nullable)(void))animations completion:(void (^ __nullable)(BOOL finished))completion NS_AVAILABLE_IOS(4_0);

方法二 ：UIView动画

[UIView beginAnimations:@"aa" context:nil];
    [UIView setAnimationDuration:_duration];
    [UIView setAnimationCurve:UIViewAnimationCurveLinear];
    [view.imgview1 removeFromSuperview];
    [view addSubview:view.imgview2];
    [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:view cache:NO];
    [UIView commitAnimations];

4. 完整代码：

ViewController.m文件代码

#import "ViewController.h"
#import "PockerView.h"
@interface ViewController ()
// 记录翻第几张牌
@property(nonatomic,assign)NSInteger index;
// 动画时间
@property(nonatomic,assign)CGFloat duration;
@end

@implementation ViewController



- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.view.backgroundColor = [UIColor blackColor];
    _duration = 0.5;
    _index = 0;
    NSArray *arr = @[@"2.jpg",@"3.jpg",@"4.jpg"];
    // 循环创建3张扑克牌
    for (int i = 0; i < 3; i++) {
        PockerView *pocker = [[PockerView alloc]initWithFrame:CGRectMake(100 + 80 * i, 100, 100, 150) imageName:arr[i]];
        pocker.tag = 1000 + i;
        [self.view addSubview:pocker];
    }
}



// 点击空白处触发
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    // 执行动画
    [self executeAnimation];
}


// 执行动画
- (void)executeAnimation{
    // 根据tag值取到扑克牌
    PockerView *pocker = [self.view viewWithTag:1000+ _index];
    // 方法一
    [self animationWithView:pocker];
    // 方法二
//    [self rotateWithView:pocker];
}

// 翻牌动画方法一（内部实现还是方法二）
- (void)animationWithView:(PockerView *)view{
    // 延时方法 正在翻转的牌翻转一半的时候把它移到视图最上面来
    [self performSelector:@selector(delayAction:) withObject:view afterDelay:_duration / 2];
    
    // 翻转动画
    UIViewAnimationOptions option =  UIViewAnimationOptionTransitionFlipFromLeft;
    [UIView transitionWithView:view                      duration:_duration
                       options:option
                    animations:^ {
                        [view.imgview1 removeFromSuperview];
                        [view addSubview:view.imgview2];
                    }
                    completion:^(BOOL finished){
                        _index++;
                        if (_index < 3) {
                            [self executeAnimation];
                        }
    }];
}

// 延时方法
- (void)delayAction:(UIView *)view{
    [self.view bringSubviewToFront:view];
}


- (void)delayAction2{
    _index++;
    if (_index < 3) {
        [self executeAnimation];
    }
}


// 方法二
- (void)rotateWithView:(PockerView *)view{
    
    [self performSelector:@selector(delayAction:) withObject:view afterDelay:_duration / 2];
    [self performSelector:@selector(delayAction2) withObject:nil afterDelay:_duration];
    [UIView beginAnimations:@"aa" context:nil];
    [UIView setAnimationDuration:_duration];
    [UIView setAnimationCurve:UIViewAnimationCurveLinear];
    [view.imgview1 removeFromSuperview];
    [view addSubview:view.imgview2];
    [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:view cache:NO];
    [UIView commitAnimations];
}
@end

PockerView.h文件代码

//
//  PockerView.h
//  翻牌
//
//  Created by 斌 on 2017/4/20.
//  Copyright © 2017年 斌. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface PockerView : UIView

@property(nonatomic,strong)UIImageView *imgview1;
@property(nonatomic,strong)UIImageView *imgview2;

- (instancetype)initWithFrame:(CGRect)frame imageName:(NSString *)imageName;

@end

PockerView.m文件代码

//
//  PockerView.m
//  翻牌
//
//  Created by 斌 on 2017/4/20.
//  Copyright © 2017年 斌. All rights reserved.
//

#import "PockerView.h"

@implementation PockerView

- (instancetype)initWithFrame:(CGRect)frame imageName:(NSString *)imageName{
    self = [super initWithFrame:frame];
    if (self) {
        
        // 设置阴影
        self.layer.shadowColor = [UIColor blackColor].CGColor;
        self.layer.shadowOffset = CGSizeMake(-10, 0);
        self.layer.shadowOpacity = 0.3;
        
        // 牌的背面
        self.imgview1 = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, frame.size.width, frame.size.height)];
        _imgview1.backgroundColor = [UIColor redColor];
        _imgview1.image = [UIImage imageNamed:@"1.jpeg"];
        [self addSubview:_imgview1];
        self.imgview1.layer.cornerRadius = 10;
        self.imgview1.clipsToBounds = YES;
        self.imgview1.layer.borderWidth = 5;
        self.imgview1.layer.borderColor = [[UIColor whiteColor] CGColor];
        
        // 牌的正面
        self.imgview2 = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, frame.size.width, frame.size.height)];
        _imgview2.backgroundColor = [UIColor redColor];
        _imgview2.image = [UIImage imageNamed:imageName];
        self.imgview2.layer.cornerRadius = 10;
        self.imgview2.clipsToBounds = YES;
        self.imgview2.layer.borderWidth = 5;
        self.imgview2.layer.borderColor = [[UIColor whiteColor] CGColor];
    }
    return self;
}
@end