等待UIView动画循环完成的最佳方法是什么？ [英] What is the best way to wait for a loop of UIView animations to finish?

问题描述

我试图遍历多个 UIViews 并在每个UIViews上执行动画，但是我想知道所有动画何时完成。动画循环结束后，调用函数的最佳方法是什么？或者，有没有办法等到全部完成？

I'm trying to loop over multiple UIViews and perform animation on each, but I'd like to know when all of the animations have finished. What is the best way to call a function when the loop of animations has finished? Alternately, is there a way to wait until all have finished?

我尝试使用 setAnimationDidStopSelector ，但不会触发。在这种情况下，我要清除游戏板上的一些碎片，使它们淡出然后被去除（NumberedChipView是UIView的子类）。直到筹码脱离板面，比赛才能继续进行。

I tried using setAnimationDidStopSelector, but it doesn't fire. In this case, I'm clearing some "chips" off a game board by having them fade out then get removed (NumberedChipView is a subclass of UIView). Play cannot continue until the chips are off the board.

[UIView beginAnimations:nil context:nil]; 
[UIView setAnimationDelegate: self];
[UIView setAnimationDidStopSelector:@selector(animationDidStop)]; 

// clear chips 
for (HexagonalTile *aTile in tilesToClear) {

    NumberedChipView *chipView = [self chipViewForColumn:aTile.column andRow:aTile.row];

    [UIView animateWithDuration:0.5 delay:0.3 options:UIViewAnimationCurveLinear animations:^{
        chipView.alpha = 0.0; 
    } 
        completion:^(BOOL finished){

         if (finished) {

             [chipView removeFromSuperview]; 
             [self.chipViews removeObject:chipView];

         }
     }]; 
}

[UIView commitAnimations]; 

我也尝试了 CATransaction 无济于事：

I also tried CATransaction to no avail:

[CATransaction begin];  

[CATransaction setCompletionBlock:^{
    [self animationFinished]; 
}];  

// clear chips 
for (HexagonalTile *aTile in tilesToClear) {

    NumberedChipView *chipView = [self chipViewForColumn:aTile.column andRow:aTile.row];

    [UIView animateWithDuration:0.5 delay:0.3 options:UIViewAnimationCurveLinear animations:^{
        chipView.alpha = 0.0; 
    } 
        completion:^(BOOL finished){

         if (finished) {

             [chipView removeFromSuperview]; 
             [self.chipViews removeObject:chipView];

             //NSLog(@"clearing finished"); 
         }
     }]; 
}

[CATransaction commit]; 

更新：

我现在可以触发选择器，但是它不等待动画循环结束。

I now can get the selector to fire, however it doesn't wait for the loop of animations to finish.

[UIView setAnimationDidStopSelector:@selector(animationDidStop:finished:)];

推荐答案

以下是对我有用的。我意识到UIView animateWithDuration方法没有与begin / commit部分相关联。相反，begin / commit部分标记了隐式动画操作的区域，因此我可以在动画中设置属性，然后将其隐式动画化。

Here's what ended up working for me. I realized that the UIView animateWithDuration methods weren't being associated to the begin/commit section. Rather, the begin/commit sections mark a region of "implicit" animation operations, so I could just set the properties within the animation and it would be implicitly animated.

例如，在下面的动画中，我只是将chipView的alpha属性设置为 0.0，并且chipView（UIView）被隐式设置为动画以消失。

For example, within the animation below, I simply set the alpha property of the chipView to "0.0" and the chipView (a UIView) is implicitly animated to disappear.

[UIView beginAnimations:@"tilescleared" context:nil]; 
[UIView setAnimationDelegate: self];
[UIView setAnimationDelay:0.3]; 
[UIView setAnimationDuration:0.5]; 
[UIView setAnimationDidStopSelector:@selector(animationDidStop:finished:context:)]; 

for (HexagonalTile *aTile in tilesToClear) {

    NumberedChipView *chipView = [self chipViewForColumn:aTile.column andRow:aTile.row];

    chipView.alpha = 0.0; 

}

[UIView commitAnimations];

然后，在我的animationDidStop方法中，执行清理并从超级视图中删除筹码。仅当循环中的所有chipView动画完成时才触发此animationDidStop方法，这是我试图弄清楚的棘手事情。

Then, in my animationDidStop method, I do the "cleanup" and remove and chips from the superview. This animationDidStop method only gets fired when all chipView animations from the loop have finished, which is the tricky thing I was trying to figure out.

- (void)animationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context 
{

    if ([animationID isEqualToString:@"tilescleared"]
                  && [finished boolValue]) {

       for (HexagonalTile *aTile in self.animationInfo.tilesToClear) {

           NumberedChipView *chipView = [self chipViewForColumn:aTile.column andRow:aTile.row];

           [chipView removeFromSuperview]; 
           [self.chipViews removeObject:chipView];
       }

   }

}

这篇关于等待UIView动画循环完成的最佳方法是什么？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！