将 UIView 框架设置为等于来自不同父视图的另一个视图的框架

Question

我正在创建位于不同超级视图中的 UIView，但我想将框架设置为彼此相等。

这是我迄今为止尝试过的

let globalPoint = self.view.convert(subViewOfOuterView.frame.origin, to: nil)
let frame = CGRect(x: globalPoint.x, y: globalPoint.y, width: self.subViewOfOuterView.frame.width, height: self.subViewOfOuterView.frame.height)
subViewOfInnerUIView.frame = frame

但我的观点最终看起来像这样

Answer 1

使用您提供的对象名称，这是一个创建第二个视图的示例，也是一个 UIButton (subViewOfInnerUIView)，它将与第一个按钮 (drawButton) 具有相同的框架。这两个按钮都是主视图中不同超级视图的子视图。我使用了一个 UIButton，因此我可以标记视图，但任何其他可以设置框架的 UIView 子类也可以工作。

请注意，由于它们具有相同的帧，除了具有相同的大小之外，它们相对于其父视图的位置也相同。

即使有问题的对象位于几层深或浅的子视图中，这也应该有效。应该没关系。

可以在最新 XCode 的单一视图游乐场中重新创建该示例。希望这会有所帮助！

//: A UIKit based Playground for presenting user interface

import UIKit
import PlaygroundSupport

class MyViewController : UIViewController {
    override func loadView() {
        let view = UIView()
        view.backgroundColor = .white
        self.view = view

        let subView1 = UIView(frame: CGRect(x: 40, y: 250, width: 300, height: 300))
        subView1.backgroundColor = .red
        view.addSubview(subView1)

        let subView2 = UIView(frame: CGRect(x: 20, y: 50, width: 340, height: 100))
        subView2.backgroundColor = .green
        view.addSubview(subView2)

        let drawButton = UIButton(frame: CGRect(x: subView1.frame.width / 2 - 50, y: 25, width: 150, height: 50))
        drawButton.backgroundColor = .blue
        drawButton.setTitle("DRAW BTN", for: .normal)
        subView1.addSubview(drawButton)

        let subViewOfInnerUIView = UIButton()
        subViewOfInnerUIView.setTitle("DRAW BTN2", for: .normal)
        subViewOfInnerUIView.backgroundColor = .brown
        subView2.addSubview(subViewOfInnerUIView)

        let frame = view.convert(drawButton.frame, to: nil)
        subViewOfInnerUIView.frame = frame
    }
}
// Present the view controller in the Live View window
PlaygroundPage.current.liveView = MyViewController()

这是使两个视图重叠的更新代码。我对更改进行了动画处理，因此很清楚，并且还评论了特定的框架以尝试解释它是如何完成的：

//: A UIKit based Playground for presenting user interface

import UIKit
import PlaygroundSupport

class MyViewController : UIViewController {
    override func loadView() {
        let view = UIView()
        view.backgroundColor = .white
        self.view = view

        let subView1 = UIView(frame: CGRect(x: 40, y: 250, width: 300, height: 300))
        subView1.backgroundColor = .red
        view.addSubview(subView1)

        let subView2 = UIView(frame: CGRect(x: 20, y: 50, width: 340, height: 100))
        subView2.backgroundColor = .green
        view.addSubview(subView2)

        let drawButton = UIButton(frame: CGRect(x: subView1.frame.width / 2 - 50, y: 25, width: 150, height: 50))
        drawButton.backgroundColor = .blue
        drawButton.setTitle("DRAW BTN", for: .normal)
        subView1.addSubview(drawButton)

        let subViewOfInnerUIView = UIButton()
        subViewOfInnerUIView.setTitle("DRAW BTN2", for: .normal)
        subViewOfInnerUIView.backgroundColor = .brown
        subView2.addSubview(subViewOfInnerUIView)

        let frame1 = drawButton.frame
        let frame2 = subView1.convert(drawButton.frame, to: view)
        let frame3 = view.convert(frame2, to: subView2)

        print(frame1) // original drawButton frame in its superview
        print(frame2) // drawButton frame relative to the main view (self.view)
        print(frame3) // drawButton frame relative to subView2 (this is the frame you want)

        subViewOfInnerUIView.frame = view.convert(drawButton.frame, to: nil)

        UIView.animate(withDuration: 5.0, delay: 0.0, options: [.autoreverse, .repeat], animations: {
            subViewOfInnerUIView.frame = frame3
        }, completion: nil)

        subViewOfInnerUIView.frame = frame3


    }
}
// Present the view controller in the Live View window
PlaygroundPage.current.liveView = MyViewController()

将 subViewOfInnerUIView.frame 设置为 frame3 的最后一行基本上就是你想要的。您可能可以创建一个函数来完成这 3 行的工作以使其更容易（将 2 个子视图作为参数），尽管如果视图层次结构很深，它可能不会那么简单：

    let frame2 = subView1.convert(drawButton.frame, to: view)
    let frame3 = view.convert(frame2, to: subView2)
    subViewOfInnerUIView.frame = view.convert(drawButton.frame, to: nil)

希望这会有所帮助！