[英]Calling layoutIfNeeded inside UIView animation block cause subviews to move earlier
我正在尝试创建自定义标注气泡。 我有一个动画块设置气泡UIView的比例转换:
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,然后在动画块内以(2)中的Identity动画,或者相反,从(2)到(1)。
如果我没有[self.view layoutIfNeeded];
在我的动画块中,从(1)到(2)可以正常工作,如下所示:
但是,当没有[self.view layoutIfNeeded];
从(2)返回到(1)时[self.view layoutIfNeeded];
,子视图会在动画完成前跳到左侧:
现在,如果我添加[self.view layoutIfNeeded];
子视图以气泡视图为动画,但是有点延迟:
从(1)到(2):
或从(2)到(1):
我已经尝试使用中心约束替换所有顶部和顶部子视图的约束,例如使用自动版式时如何调整CALayer的锚点。 并且还尝试了层变换解决方案(但是这一解决方案打破了布局约束,因为它不能满足所有约束)。
关于如何解决动画问题有什么想法吗?
提前致谢。
更新:我正在用实际调用的方法更新问题
- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)annotationView
和
- (void)mapView:(MKMapView *)mapView didDeselectAnnotationView:(MKAnnotationView *)annotationView
呈现和消除我的自定义标注框(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);
}
}
}
这可能会有所帮助。 根据Apple文档-layoutIfNeeded强制尽早布局
- (void)setNeedsLayout;
- (void)layoutIfNeeded;
因此,您可以尝试setNeedsLayout。 这应该满足您提到的第一种情况。
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