iphone - for循环中的UIButton翻转动画

Question

我的代码如下，

int i;
for (i=1; i < 13; i++ ){
    UIButton * myButton1 = (UIButton *)([self.view viewWithTag:i]);
    NSString *imageLoop2=[NSString stringWithFormat:@"%@",[arr1 objectAtIndex:i-1]];

    [UIView beginAnimations:@"Flip" context:NULL];
    [UIView setAnimationDuration:0.60];
    [UIView setAnimationDelegate:self];
    [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight forView:myButton1 cache:NO];
    myButton1.userInteractionEnabled = NO;
    myButton1.alpha=1.0f;
    [myButton1 setBackgroundImage:[UIImage imageNamed:imageLoop2] forState:UIControlStateNormal];

    [UIView commitAnimations];

}

它会在相同的时间内翻转所有按钮。
但我的问题是它在一个接一个地翻转时出现“第一个按钮完成翻转动画然后第二个按钮开始翻转”

请给我建议。

谢谢

Answer 1

在同一个 block 中一个接一个地做动画。尝试[UIView setAnimationDelay:delay];

还要记住，2 block 或单 block 动画是在后台线程中执行的。所以有了这个改变 -

int i;
[UIView beginAnimations:@"Flip" context:NULL];
[UIView setAnimationDelegate:self];
float delay = 0;
float duration = 0.6;

for (i=1; i < 13; i++ ){
    UIButton * myButton1 = (UIButton *)([self.view viewWithTag:i]);
    NSString *imageLoop2 = [NSString stringWithFormat:@"%@",[arr1 objectAtIndex:i-1]];

    [UIView setAnimationDelay:delay];
    [UIView setAnimationDuration:duration];
    [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight forView:myButton1 cache:NO];
    myButton1.userInteractionEnabled = NO;
    myButton1.alpha=1.0f;
    [myButton1 setBackgroundImage:[UIImage imageNamed:imageLoop2] forState:UIControlStateNormal];
    delay = delay + duration;

}
[UIView commitAnimations];

此外，Apple Docs 表示，与您正在执行的 2 block 动画相比，单 block 动画在性能方面更加流畅。只是一个想法...