我有一个滚动视图,当它上面没有按钮时会滚动.现在确实如此,并且当拖动鼠标(在模拟器上)时,什么也没有发生(我认为是因为按钮被按下了).我怎样才能做到这一点?
I have a scroll view that used to scroll when it didn't have buttons all over it. Now it does, and when dragging the mouse (on simulator) nothing happens (i think because the buttons are being pushed). How can I make this right?
发生这种情况是因为 UIScrollView
的 UIButton
子视图(我假设按钮作为子视图添加到您的case) 正在跟踪触摸而不是滚动视图.UIScrollView
方法 touchesShouldCancelInContentView
是这里的关键.根据其描述:如果view不是UIControl
对象,则默认返回YES;否则返回NO
.",即对于UIControl
对象(按钮),UIScrollView
不会尝试取消阻止滚动的触摸.
This is happening because UIButton
subviews of the UIScrollView
(I assume buttons are added as subviews in your case) are tracking the touches and not the scroll view. UIScrollView
method touchesShouldCancelInContentView
is the key here. According to its description: "The default returned value is YES if view is not a UIControl
object; otherwise, it returns NO
.", i.e. for UIControl
objects (buttons), UIScrollView
does not attempt to cancel touches which prevents scrolling.
所以,要允许使用按钮滚动:
So, to allow scrolling with buttons:
UIScrollView
属性 canCancelContentTouches
设置为 YES
.UIScrollView
并覆盖 touchesShouldCancelInContentView
以在内容视图对象是 UIButton
时返回 YES
,如下所示:UIScrollView
property canCancelContentTouches
is set to YES
. UIScrollView
and override touchesShouldCancelInContentView
to return YES
when content view object is a UIButton
, like this:- (BOOL)touchesShouldCancelInContentView:(UIView *)view
{
if ( [view isKindOfClass:[UIButton class]] ) {
return YES;
}
return [super touchesShouldCancelInContentView:view];
}
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