动画UIImagevIew上的UITouch事件

Question

我使用的是snow示例代码，它从屏幕顶部掉落UImages。我想在UIImageview上检测触摸并更新标签。如果我在IBOutlet中创建单个UIImageView并将其连接到触摸事件，标签就会正确更新。但当我尝试将它应用于掉落的UIImageView时，它不起作用。以下是目前为止的内容:

    - (void)viewDidLoad {
     [super viewDidLoad];
     score = 0;
     self.view.backgroundColor = [UIColor colorWithRed:0.5 green:0.5 blue:1.0 alpha:1.0];
     flakeImage = [UIImage imageNamed:@"flake.png"];
     [NSTimer scheduledTimerWithTimeInterval:(0.5) target:self selector:@selector(onTimer) userInfo:nil repeats:YES];
}
- (void)onTimer
{
    flakeView = [[UIImageView alloc] initWithImage:flakeImage];
    flakeView.opaque = YES;
    flakeView.userInteractionEnabled = YES;
    flakeView.multipleTouchEnabled = YES;
     int startX = round(random() % 320);
     int endX = round(random() % 320);
     double scale = 1 / round(random() % 100) + 1.0;
     double speed = 1 / round(random() % 100) + 1.0;
     flakeView.frame = CGRectMake(startX, -100.0, 25.0 * scale, 25.0 * scale);
     [self.view addSubview:flakeView];
     [self.view bringSubviewToFront:flakeView];
     [UIView beginAnimations:nil context:flakeView];
     [UIView setAnimationDuration:5 * speed];
     flakeView.frame = CGRectMake(endX, 500.0, 25.0 * scale, 25.0 * scale);
     [UIView setAnimationDidStopSelector:@selector(onAnimationComplete:finished:context:)];
     [UIView setAnimationDelegate:self];
     [UIView commitAnimations];     
}
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [touches anyObject];
    if ([touch view] == flakeView)
    {
        NSLog(@"tag %@",touch);
        score = score + 1;
        lbl1.text = [NSString stringWithFormat:@"%i", score];        
    }
}

Answer 1

动画通常禁用触摸处理，所以你必须使用:

 animateWithDuration:delay:options:animations:completion

设置接收触摸的选项。

http://developer.apple.com/library/IOs/文档/WindowsViews/概念/ViewPG_iPhoneOS/AnimatingViews AnimatingViews.html #//apple_ref/doc/uid/TP40009503-CH6-SW1

IIRC你想要的选项是:UIViewAnimationOptionAllowUserInteraction寻找在上面的完整列表文档中的UIViewAnimationOptions