如何在另一个视图中获取视图的框架？

Question

我UIImageView在self.view(主视图)中有一个,里面有一个UIButton.我想知道什么是的框架UIButton中self.view没有UIImageView.

Answer 1

我想你正在寻找这种方法

- convertRect:toView:

// Swift
let frame = imageView.convert(button.frame, to: self.view)

// Objective-C
CGRect frame = [imageView convertRect:button.frame toView:self.view];

Answer 2

有四种UIView方法可以帮助你,转换CGPoints和CGRects从一个UIView坐标参考到另一个:

– convertPoint:toView:
– convertPoint:fromView:
– convertRect:toView:
– convertRect:fromView:

所以你可以试试

CGRect f = [imageView convertRect:button.frame toView:self.view];

要么

CGRect f = [self.view convertRect:button.frame fromView:imageView];

Answer 3

斯威夫特3

您可以将按钮的框架转换为视图的坐标系:

self.view.convert(myButton.frame, from: myButton.superview)

确保把你的逻辑放在里面viewDidLayoutSubviews而不是viewDidLoad.在布置子视图后应执行与几何相关的操作,否则它们可能无法正常工作.

class ViewController: UIViewController {

    @IBOutlet weak var myImageView: UIImageView!
    @IBOutlet weak var myButton: UIButton!

    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()

        let buttonFrame = self.view.convert(myButton.frame, from: myButton.superview)
    }
}

您可以引用myButton.superview而不是myImageView转换帧时.

以下是转换CGPoint或转换的更多选项CGRect.

self.view.convert(point: CGPoint, from: UICoordinateSpace)
self.view.convert(point: CGPoint, from: UIView)             
self.view.convert(rect: CGRect, from: UICoordinateSpace)
self.view.convert(rect: CGRect, from: UIView)

self.view.convert(point: CGPoint, to: UICoordinateSpace)
self.view.convert(point: CGPoint, to: UIView)
self.view.convert(rect: CGRect, to: UICoordinateSpace)
self.view.convert(rect: CGRect, to: UIView)

有关转换a 或的更多信息,请参阅Apple Developer Docs.CGPointCGRect