Question

我有几个用例，我需要以编程方式添加标签和＆＃34;容器＆＃34;视图（例如UIView）到StackViews和其他控件。

我无法获得要渲染的标签，我确信这是一个简单的布局标志，我忽略了设置。

下面的示例：使用UIView.addSubview（）以编程方式呈现UILabel

import UIKit

class TestViewController: UIViewController {

  var label = UILabel()
  var container = UIView()

  open override func viewDidLoad() {
    super.viewDidLoad()

    container = UIView(frame: CGRect(x: 0, y: 0, width: 200, height: 200))

    label.text = "Hello World!"
    label.textColor = .white


    container.addSubview(label)  // <- This does not work

    self.view.addSubview(container)

  }


}

以下代码块有效，但没有利用Autolayout。任何帮助将不胜感激。

import UIKit

class TestViewController: UIViewController {

  var label = UILabel()
  var container = UIView()

  open override func viewDidLoad() {
    super.viewDidLoad()

    container = UIView(frame: CGRect(x: 0, y: 0, width: 200, height: 200))

    label.text = "Hello World!"
    label.textColor = .white


    container.layout(label).topLeft() // <- This works

    self.view.addSubview(container)

  }


}

Answer 1

想出来......

import UIKit

class TestViewController: UIViewController {

  var label = UILabel()
  var container = UIView()

  open override func viewDidLoad() {
    super.viewDidLoad()

    container = UIView(frame: CGRect(x: 0, y: 0, width: 200, height: 200))

    label.text = "Hello World!"
    label.textColor = .white
    label.frame = container.frame


    container.addSubview(label)

    self.view.addSubview(container)

  }


}

当以编程方式使用addSubview时，Swift 3 UIView不呈现UILabel

1 个答案: