我正在尝试创建一个自定义标注气泡。我有一个动画块设置气泡 UIView 的比例变换：
self.view.transform = CGAffineTransformMakeScale(0, 0); // (1)
self.view.transform = CGAffineTransformIdentity; // (2)
我要么在 (1) 中以比例 (0, 0) 开始气泡视图，然后像在动画块内的 (2) 中那样动画到 Identity，或者相反，从 (2) 到 (1)。
如果我的[self.view layoutIfNeeded];动画块中没有，从 (1) 到 (2) 可以正常工作，如下所示：
但是当从 (2) 回到 (1) 没有 时[self.view layoutIfNeeded];，子视图会在动画完成之前跳到左边：
现在，如果我确实添加了[self.view layoutIfNeeded];带有气泡视图的子视图动画，但有一种延迟：
从（1）到（2）：
或从（2）到（1）：
我已经尝试用中心约束替换所有顶部和前导子视图的约束，例如在使用自动布局时如何调整 CALayer 的锚点？并且还尝试了图层转换解决方案（但是这个解决方案打破了布局约束，说它不能满足所有约束）。
关于如何解决我的动画问题的任何想法？
提前致谢。
更新： 我正在用我调用的实际方法更新问题
- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)annotationView
和
- (void)mapView:(MKMapView *)mapView didDeselectAnnotationView:(MKAnnotationView *)annotationView
呈现和关闭我的自定义标注气泡（暂时忘记展开状态）。
- (void)setCalloutState:(CalloutState)calloutState
animated:(BOOL)animated
annotationView:(MKAnnotationView *)annotationView
completion:(void (^)(BOOL finished))completion
{
if (self.view.superview == annotationView || !annotationView) {
} else {
// [self.view.layer removeAllAnimations];
[self.view removeFromSuperview];
self.view.transform = CGAffineTransformIdentity;
self.view.bounds = CGRectMake(0, 0, normalViewWidth, normalViewHeight);
self.view.transform = CGAffineTransformMakeScale(0, 0);
self.view.center = CGPointMake(annotationView.bounds.size.width / 2, 0);
[annotationView addSubview:self.view];
}
void (^animationBlock)(void) = ^{
self.view.transform = CGAffineTransformIdentity;
switch (calloutState) {
case CalloutStateHidden:
self.view.bounds = CGRectMake(0, 0, normalViewWidth, normalViewHeight);
self.view.transform = CGAffineTransformMakeScale(0, 0);
break;
case CalloutStateNormal:
self.view.bounds = CGRectMake(0, 0, normalViewWidth, normalViewHeight);
break;
case CalloutStateExpanded:
self.view.bounds = CGRectMake(0, 0, expandedViewWidth, expandedViewHeight);
break;
default:
break;
}
self.view.center = CGPointMake(annotationView.bounds.size.width / 2, 0);
[self.view layoutIfNeeded];
};
if (animated) {
// TODO: figure out why the first animateWithDuration is needed in this nested thing
[UIView animateWithDuration:0
delay:0
options:UIViewAnimationOptionBeginFromCurrentState
animations:NULL
completion:^(BOOL finished) {
[UIView animateWithDuration:1.3
delay:0
options:UIViewAnimationOptionBeginFromCurrentState
animations:animationBlock
completion:^(BOOL finished) {
if (finished) {
self.calloutState = calloutState;
// TODO: figure out how to end UIView animation instantly so we don't need the second condition at the if
// having a concurrency problem here
if (calloutState == CalloutStateHidden && self.view.superview == annotationView) {
[self.view removeFromSuperview];
}
self.editingEnabled = calloutState == CalloutStateExpanded;
}
if (completion) {
completion(finished);
}
}];
}];
// ---------------------------------------------------------------------------------
} else {
animationBlock();
self.calloutState = calloutState;
if (calloutState == CalloutStateHidden) {
[self.view removeFromSuperview];
}
self.editingEnabled = calloutState == CalloutStateExpanded;
if (completion) {
completion(YES);
}
}
}