UIView*blueView=[[UIViewalloc]initWithFrame:CGRectMake(10,10,100,100)];blueView.backgroundColor=[UIColorblueColor];[scrollViewaddSubview:blueView];scrollView.contentSize=CGSizeMake(1500,2000);我可以在大部分scrollView中拖动滚动,但在blueView中开始触摸时拖动不起作用。在UIView(本例中为blueView)中开始的触摸如何滚动UIScrollView?blueView不是firs
iOS判断当前点击的位置是否在某个视图上记录几种判断触摸点是否在某个view上面的方法第一种方式:isDescendantOfView:通过touch.view调用isDescendantOfView:方法,返回YES,则触摸点在我们需要判断的视图上;反之则不在。-(void)touchesBegan:(NSSet*)toucheswithEvent:(UIEvent*)event{UITouch*touch=[touches.allObjectslastObject];BOOLresult=[touch.viewisDescendantOfView:self.blueView];NSLog(
我有一堆UIView类。有些符合特定的协议(protocol)。我有一个包含这些特定数组的数组,但我无法在此数组上调用index(of:)(此代码可以粘贴到Playground中):importUIKitprotocolViewWithColor{}classBlackView:UIView{}classWhiteView:UIView{}classBlueView:UIView,ViewWithColor{}classGreenView:UIView,ViewWithColor{}classYellowView:UIView,ViewWithColor{}letblackView=B