雪花飘落效果

听老歌

雪花飘落效果

Ios代码

1. 1.- (void)viewDidLoad {   
   
2. 2.    [super viewDidLoad];   
   
3. 3.    flakeImage = [UIImage imageNamed:@"flake.png"];   
   
4. 4.    [NSTimer scheduledTimerWithTimeInterval:(0.05) target:self selector:@selector(play) userInfo:nil repeats:YES];   
   
5. 5.}   
   
6. 6.  
   
7. 7.- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {   
   
8. 8.    return (interfaceOrientation == UIInterfaceOrientationLandscapeLeft);   
   
9. 9.}   
   
10. 10.  
    
11. 11.- (void)play {   
    
12. 12.    UIImageView *flakeView = [[UIImageView alloc] initWithImage:flakeImage];   
    
13. 13.    int startX = round(random() % 1024);   
    
14. 14.    int endX = round(random() % 1024);   
    
15. 15.    double scale = 1 / round(random() % 100) + 1.0;   
    
16. 16.    double speed = 1 / round(random() % 100) + 1.0;   
    
17. 17.    flakeView.frame = CGRectMake(startX, -100.0, 25.0 * scale, 25.0 * scale);   
    
18. 18.    flakeView.alpha = 0.55;   
    
19. 19.    [self.view addSubview:flakeView];      
    
20. 20.    [UIView beginAnimations:nil context:flakeView];   
    
21. 21.    [UIView setAnimationDuration:5 * speed];   
    
22. 22.    flakeView.frame = CGRectMake(endX, 768.0, 25.0 * scale, 25.0 * scale);   
    
23. 23.    [UIView setAnimationDidStopSelector:@selector(onAnimationComplete:finished:context:)];   
    
24. 24.    [UIView setAnimationDelegate:self];   
    
25. 25.    [UIView commitAnimations];   
    
26. 26.}   
    
27. 27.  
    
28. 28.- (void)onAnimationComplete:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context {   
    
29. 29.    UIImageView *flakeView = context;   
    
30. 30.    [flakeView removeFromSuperview];   
    
31. 31.    [flakeView release];   
    
32. 32.}  
    
33. - (void)viewDidLoad {
    
34.     [super viewDidLoad];
    
35.         flakeImage = [UIImage imageNamed:@"flake.png"];
    
36.         [NSTimer scheduledTimerWithTimeInterval:(0.05) target:self selector:@selector(play) userInfo:nil repeats:YES];
    
37. }
    
38. 
    
39. - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    
40.         return (interfaceOrientation == UIInterfaceOrientationLandscapeLeft);
    
41. }
    
42. 
    
43. - (void)play {
    
44.         UIImageView *flakeView = [[UIImageView alloc] initWithImage:flakeImage];
    
45.         int startX = round(random() % 1024);
    
46.         int endX = round(random() % 1024);
    
47.         double scale = 1 / round(random() % 100) + 1.0;
    
48.         double speed = 1 / round(random() % 100) + 1.0;
    
49.         flakeView.frame = CGRectMake(startX, -100.0, 25.0 * scale, 25.0 * scale);
    
50.         flakeView.alpha = 0.55;
    
51.         [self.view addSubview:flakeView];       
    
52.         [UIView beginAnimations:nil context:flakeView];
    
53.         [UIView setAnimationDuration:5 * speed];
    
54.         flakeView.frame = CGRectMake(endX, 768.0, 25.0 * scale, 25.0 * scale);
    
55.         [UIView setAnimationDidStopSelector:@selector(onAnimationComplete:finished:context:)];
    
56.         [UIView setAnimationDelegate:self];
    
57.         [UIView commitAnimations];
    
58. }
    
59. 
    
60. - (void)onAnimationComplete:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context {       
    
61.         UIImageView *flakeView = context;
    
62.         [flakeView removeFromSuperview];
    
63.         [flakeView release];
    
64. }

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示例图：

冰释一片天

谢谢分享

arthinking

不错，考虑下怎么用Android实现。