ios 如何将子视图的框架坐标系转换为自身视图的坐标系
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How to convert SubView's Frame Coordinate System to Self View's Coordinate System
提问by rcmstark
I create programmatically one scrollView and some buttons inside there. When I click the any button have to show a popover.
我以编程方式创建了一个滚动视图和其中的一些按钮。当我单击任何按钮时，必须显示一个弹出窗口。
My button's origin in self.view is like (100,11) and inside scrollView (9,11) and scrowView is in somewhere in self.view. The popover shows in (9,11) but right one would be (100,11). I try use convert without success.
我的按钮在 self.view 中的原点类似于 (100,11) 和内部 scrollView (9,11) 并且 scrowView 位于 self.view 中的某个地方。弹出框显示在 (9,11) 中，但正确的是 (100,11)。我尝试使用 convert 没有成功。
-(IBAction)showPopover:(id)sender{
//... implemented popover above
//Wrong Origin:
NSLog(@"wrong x:%f y:%f",[sender frame].origin.x, [sender frame].origin.y);
//Transform to correct
CGRect frame = [self.view convertRect:[sender frame] toView:nil];
//Shoulf be right, but is not...
NSLog(@"new x:%f y:%f",frame.origin.x, frame.origin.y);
}
Anyone cam help me?
有人帮我吗？
回答by Nikolai Ruhe
A view's frame is already in the superview's coordinate system. So if your setup is self.viewcontains scrollviewcontains sender:
视图的框架已经在父视图的坐标系中。因此，如果您的设置self.view包含scrollviewcontains sender：
CGRect frame = [sender.superview convertRect:sender.frame toView:self.view];
// or, better:
CGRect frame = [sender convertRect:sender.bounds toView:self.view];
回答by Hemang
Swift:
迅速：
let frame = sender.convert(sender.bounds, to: self.view)
