将 cgrect 框架上的 y 值更改为屏幕顶部下方的 80

Question

我希望我的 swift 代码在屏幕上放置 2 个图像视图。图像视图通过 cgrect 框架放置。我想要的是 box1 从屏幕顶部覆盖到屏幕高度的 80%。 box2 应覆盖底部 20% 的高度。不知何故，在 y 值上，我需要 box2 从屏幕顶部下方 80 处开始。

import UIKit

class ViewController: UIViewController {
    
    
    
    var box1 = UIImageView()
    var box2 = UIImageView()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        
        let VCframe = self.view.frame
        let height = VCframe.height * 0.8
        
        let height2 = VCframe.height * 0.2
        let widthx = VCframe.width
        view.addSubview(box1)
        view.addSubview(box2)
        box1.backgroundColor = .red
        box2.backgroundColor = .blue
        
        
        box1.frame = CGRect(x: 0, y: 0, width: widthx, height: height)
        box2.frame = CGRect(x: 0, y: 0, width: widthx, height: height2)
        
    }
    
    
    
    
}

Answer 1

所以我认为这就是您正在寻找的解决方案：

    class ViewController: UIViewController {

    var box1 = UIImageView()
    var box2 = UIImageView()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        
        let VCframe = self.view.frame
        let height = VCframe.height * 0.8
        
        let height2 = VCframe.height * 0.2
        let widthx = VCframe.width
        view.addSubview(box1)
        view.addSubview(box2)
        box1.backgroundColor = .red
        box2.backgroundColor = .blue
        box1.translatesAutoresizingMaskIntoConstraints = false
        box2.translatesAutoresizingMaskIntoConstraints = false
        
        
        box1.frame = CGRect(x: 0, y: 0, width: widthx, height: height)
        box2.frame = CGRect(x: 0, y: height, width: widthx, height: height2)
        
    }
}

但是，使用框架作为布局模式并不是一个好主意。

这可能是您想要做的：

    class ViewController: UIViewController {

    var box1 = UIImageView()
    var box2 = UIImageView()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        loadViews()
    }
    
    private func loadViews() {
        view.addSubview(box1)
        view.addSubview(box2)
        box1.backgroundColor = .red
        box2.backgroundColor = .blue
        box1.translatesAutoresizingMaskIntoConstraints = false
        box2.translatesAutoresizingMaskIntoConstraints = false
        
        NSLayoutConstraint.activate([
            box1.leadingAnchor.constraint(equalTo: view.leadingAnchor),
            box1.trailingAnchor.constraint(equalTo: view.trailingAnchor),
            box1.heightAnchor.constraint(equalToConstant: UIScreen.main.bounds.height*0.8),
            box1.topAnchor.constraint(equalTo: view.topAnchor),
            
            box2.leadingAnchor.constraint(equalTo: view.leadingAnchor),
            box2.trailingAnchor.constraint(equalTo: view.trailingAnchor),
            box2.topAnchor.constraint(equalTo: box1.bottomAnchor),
            box2.bottomAnchor.constraint(equalTo: view.bottomAnchor)
        ])
    }
}

将 cgrect 框架上的 y 值更改为屏幕顶部下方的 80

change the y value on a cgrect frame to 80 below the top of the screen

frame

percentage

ios

cgrect

swift