在Swift中将UIView粘贴到ViewController框架的底部

Question

我创建了一个UIView(它只是一个蓝色矩形),我希望它能粘在屏幕框架/视图的底部.

var nextBar = UIView()

nextBar.backgroundColor = UIColor(red: 7/255, green: 152/255, blue: 253/255, alpha: 0.5)
nextBar.frame = CGRect(x: 0, y: 600, width: self.view.frame.width, height: 50)
self.view.addSubview(nextBar)

我假设我需要在CGRect中的'y:'部分之后添加一些内容,但我似乎无法使其工作或找到任何能够在swift中向我显示此内容的内容.

提前致谢

Answer 1

嗯试试这个......

override func viewDidLoad() {
  super.viewDidLoad()

  let theHeight = view.frame.size.height //grabs the height of your view

  var nextBar = UIView()

  nextBar.backgroundColor = UIColor(red: 7/255, green: 152/255, blue: 253/255, alpha: 0.5)

  nextBar.frame = CGRect(x: 0, y: theHeight - 50 , width: self.view.frame.width, height: 50)

  self.view.addSubview(nextBar)

}

对于CRect中的'y:',你需要考虑屏幕尺寸的大小,并且你要减去你想要的像素数.对于任何屏幕尺寸,它看起来都是一样的.

Answer 2

您可以使用约束以编程方式进行操作

fileprivate func setupName(){
        let height = CGFloat(50)

        lblName.text = "Hello world"
        lblName.backgroundColor = .lightGray

        //Step 1
        lblName.translatesAutoresizingMaskIntoConstraints = false

        //Step 2
        self.view.addSubview(lblName)

        //Step 3
        NSLayoutConstraint.activate([

            lblName.leadingAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.leadingAnchor),
            lblName.trailingAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.trailingAnchor),
            lblName.topAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.bottomAnchor,constant: -height),
            lblName.bottomAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.bottomAnchor),
            ])

    }

请参考链接了解更多详情