内部动画时的UIScrollView回调 [英] UIScrollView callbacks while animating internally
问题描述
我有UIScrollView，其中一个被缩放的孩子(在viewForZoomingInScrollView:scrollView中返回)，还有多个其他孩子，它们注释了缩放视图，并且应始终位于相对坐标的缩放视图顶部
I have UIScrollView with one child that is zoomed (returned in viewForZoomingInScrollView:scrollView) and a number of other children which annotate the zoomed view and should always be positioned on top of the zoomed view at relative coordinates
UIScrollView
- zoomChild (size 100x100 at scale 1)
- Annotate Child (size 10x10), always placed at relative position (0.2, 0.2) of zoomChild's frame
我将UIScrollView子类化，并覆盖了scrollViewDidZoom:.我将注解子项定位为
I've subclassed UIScrollView and overridden scrollViewDidZoom:. I position an annotation child like
- (void)scrollViewDidZoom:(UIScrollView *)scrollView
{
self.annotateChild.frame = CGRectMake(0.2*100*self.zoomScale, 0.2*100*self.zoomScale, 10, 10);
}
只要用户与滚动视图进行交互，此方法就可以正常工作. scrollViewDidZoom:/scrollViewDidScroll :，但是，似乎何时不被调用
This works fine as long as the user is interacting with the scrollview. scrollViewDidZoom:/scrollViewDidScroll:, however, seems not to be called when
-
zoomBounce:scrollview比minZoom缩小，用户松开手指，scrollview动画返回minScale. scrollViewDidZoom:在动画完成时调用，而不是在动画完成时调用.
zoomBounce: scrollview is pinched smaller than minZoom, user releases his finger and scrollview animates back to minScale. scrollViewDidZoom: is called when the animation is complete, but not during.
使用zoomToRect:animated:缩放到矩形时.同样，直到动画完成后才调用scrollViewDidZoom:.
When zooming to a rect using zoomToRect:animated:. Again, scrollViewDidZoom: is not called until animation has completed.
所以问题归结为:每当self.zoomScale发生变化时，包括通过内部动画发生这种情况时，如何通知我?
So the question boils down to: how can I get notified whenever self.zoomScale changes, including when this happens via some internal animation?
或者，我可以将注释视图作为子视图添加到zoomView中，并以某种方式确保它们未缩放吗?
Alternatively, can I add my annotation views as subviews to the zoomView and somehow make sure that they are not scaled?
推荐答案
Here is an answer that might work: In iOS 4.0, why does UIScrollView zoomToRect:animated: not trigger the scrollViewDidScroll or scrollViewDidZoom delegates while animating?
我需要做的和你一样，但是我还没有尝试一下.
I need to do the same as you, but I didn't get to try it out yet.
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