165在屏幕中实现过渡动画效果

效果如下：

ViewController.h

1 #import <UIKit/UIKit.h>
2
3 @interface ViewController : UIViewController
4 @end

ViewController.m

 1 #import "ViewController.h"
 2
 3 @interface ViewController ()
 4 - (void)layoutUI;
 5 - (UIImageView *)nextView;
 6 - (void)animationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context;
 7 @end
 8
 9 @implementation ViewController
10 #define kViewTag 1
11
12 - (void)viewDidLoad {
13     [super viewDidLoad];
14
15     [self layoutUI];
16 }
17
18 - (void)didReceiveMemoryWarning {
19     [super didReceiveMemoryWarning];
20     // Dispose of any resources that can be recreated.
21 }
22
23 - (void)layoutUI {
24     self.view.backgroundColor = [UIColor blackColor];
25
26     [self.view addSubview:[self nextView]];
27 }
28
29 - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
30     static UIViewAnimationTransition transition = UIViewAnimationTransitionNone;
31     UIImageView *imgVCurrent = [self nextView];
32
33     [UIView beginAnimations:nil context:NULL];
34     [UIView setAnimationDuration:2.0];
35     [UIView setAnimationDelegate:self];
36     [UIView setAnimationDidStopSelector:@selector(animationDidStop:finished:context:)];
37     [UIView setAnimationTransition:transition forView:self.view cache:YES];
38     [[self.view viewWithTag:kViewTag] removeFromSuperview];
39     [self.view addSubview:imgVCurrent];
40     [UIView commitAnimations];
41
42     //将动画设置为无效状态
43     [UIView setAnimationsEnabled:NO];
44     //切换过渡效果
45     switch (transition) {
46         case UIViewAnimationTransitionNone: //无过渡效果；作为默认值
47         case UIViewAnimationTransitionFlipFromLeft: //从左翻转效果
48         case UIViewAnimationTransitionFlipFromRight: //从右翻转效果
49         case UIViewAnimationTransitionCurlUp: { //从下往上翻页效果
50             transition++;
51             break;
52         }
53         case UIViewAnimationTransitionCurlDown: { //从上往下翻页效果
54             transition = UIViewAnimationTransitionNone;
55             break;
56         }
57     }
58 }
59
60 - (UIImageView *)nextView {
61     static BOOL isFirstView = YES;
62     UIImage *img = [UIImage imageNamed: (isFirstView ? @"Animation1" : @"Animation2")];
63     isFirstView = !isFirstView;
64
65     UIImageView *imgV = [[UIImageView alloc] initWithImage:img];
66     imgV.tag = kViewTag;
67     CGFloat widthOfImg = img.size.width * 3; //以原图片宽度的3倍放大，作为图片视图的图片宽度
68     CGFloat heightOfImg = img.size.height * 3; //以原图片高度的3倍放大，作为图片视图的图片高度
69     imgV.frame = CGRectMake(CGRectGetMidX(self.view.frame) - widthOfImg/2,
70                             CGRectGetMidY(self.view.frame) - heightOfImg/2 + 10,
71                             widthOfImg,
72                             heightOfImg);
73     return imgV;
74 }
75
76 - (void)animationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context {
77     //将动画设置为有效状态
78     [UIView setAnimationsEnabled:YES];
79 }
80
81 @end