xcode 如何测试一个点是否在视图中
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How to test if a point is in a view
提问by Blane Townsend
I have a UIImageViewand I have a CGPointon the screen. I want to be able to test that point to see if it is in the UIImageView. What would be the best way to do this?
我有一个UIImageView，CGPoint屏幕上有一个。我希望能够测试该点以查看它是否在UIImageView. 什么是最好的方法来做到这一点？
回答by Deepak Danduprolu
CGPointis no good with a reference point. If your point is in window's coordinates then you can get it using
CGPoint有参考点是不行的。如果您的点在窗口的坐标中，那么您可以使用
CGPoint locationInView = [imageView convertPoint:point fromView:imageView.window];
if ( CGRectContainsPoint(imageView.bounds, locationInView) ) {
// Point lies inside the bounds.
}
You may also call pointInside:withEvent:method
你也可以调用pointInside:withEvent:方法
if ( [imageView pointInside:locationInView withEvent:nil] ) {
// Point lies inside the bounds
}
回答by Den
Tested in Swift 4
在 Swift 4 中测试
view.frame.contains(point)
回答by Kal
if(CGRectContainsPoint([myView frame], point))
where point is your CGPoint and myView is your UIImageView
其中 point 是你的 CGPoint 而 myView 是你的 UIImageView
回答by Mac
I'll assume you have a full-screen window (pretty reasonable, I think). Then you can transform the point from the window's coordinate space to the UIImageView's using:
我假设你有一个全屏窗口（我认为很合理）。然后，您可以使用以下命令将点从窗口的坐标空间转换为 UIImageView 的坐标空间：
CGPoint point = ...
UIWindow window = ...
UIImageView imageView = ...
CGPoint transformedPoint = [window convertPoint:point toView:imageView];
Then, you can test if the point is in the image view's frame as follows:
然后，您可以测试该点是否在图像视图的框架中，如下所示：
if(CGRectContainsPoint(imageView.frame, transformedPoint))
{
// do something interesting....
}
回答by Darshit Shah
In Swift 3
在斯威夫特 3
let isPointInFrame = UIScreen.main.bounds.contains(newLocation)
