动画一个uiview数组

Question

我有一个uiview数组，我用下面的代码动画:

for (int i = 0; i<(int)viewArray.count; i++) {
    UIView *view = [viewArray objectAtIndex:i];
    CALayer *layer = view.layer;
    //animate the layer
}

我的问题是，有没有办法在每个动画之间有一个延迟，这样，例如，它在数组中动画一个UIView，下一个动画在0.2秒左右开始?任何帮助将非常感激!

Answer 1

您可以尝试下面的

float timeDelay = 0.2
float duration = YOUR_DURATION
for (int i = 0; i<(int)viewArray.count; i++) {
    UIView *view = [viewArray objectAtIndex:i];
    //animate the layer
    [UIView animateWithDuration:duration delay:(i+1)*timeDelay
            options: {Check UIView Class Reference on developer.apple.com}
            animations:^{
                   [view.layer fantastic animation here];
            } completion^(BOOL finised){
                   if(finished){
                     //Leave blank if nothing, good practice to implement debuging here or post  animation processes here (like removing a subview from a super)
                   }
            }];
}

请记住，如果你把你的程序发送到后台，它可能会破坏你的动画，所以一定要在你的应用程序委托中调用这个方法:

- (void)applicationWillEnterForeground:(UIApplication *)application;

希望有所帮助

Answer 2

用这个家伙:

+ (void)animateWithDuration:(NSTimeInterval)duration delay:(NSTimeInterval)delay options:(UIViewAnimationOptions)options animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion

使用第二个参数。在循环中，调用该函数，将一个递增的数字传递给该参数。