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定位UILabel

xcode swift ios

Rue Vitale · 技术社区 · 2 年前

我使用以下代码在屏幕上定位UILabel

   innerView = UIView(frame: view.bounds)
    self.view.addSubview(innerView)
    
    let headingLbl = UILabel(frame: CGRect(x: 20, y: 20, width: innerView.frame.width - 40, height: 30))
    headingLbl.font = UIFont(name: "Inter-Bold", size: 20);
    headingLbl.text = "What are your goals?"
    headingLbl.textAlignment = .center
    headingLbl.textColor = .black
    innerView.addSubview(headingLbl)

不幸的是,UILabel被渲染在靠近电池和wifi的最顶部。我甚至看不见它。但我想知道它是否能在不同的iPhone上正常渲染。标签的正确定位方式是什么?我不想使用自动布局。

见附图。

2 回复 | 直到 2 年前

GoksuBayy 2 年前

使用NSLayoutConstraint代替CGRect(x,y,width,height)。

 innerView = UIView(frame: view.bounds)
self.view.addSubview(innerView)

let headingLbl = UILabel()
headingLbl.font = UIFont(name: "Inter-Bold", size: 20);
headingLbl.text = "What are your goals?"
headingLbl.textAlignment = .center
headingLbl.textColor = .black
headingLbl.translatesAutoresizingMaskIntoConstraints = false // Use it to set constraint correctly
innerView.addSubview(headingLbl)


NSLayoutConstraint.activate([
  headingLbl.topAnchor.constraint(equalTo: innerView.topAnchor, constant: 20),
  headingLbl.leadingAnchor.constraint(equalTo: innerView.leadingAnchor, constant: 20),
  headingLbl.trailingAnchor.constraint(equalTo: innerView.trailingAnchor, constant: -20),
  headingLbl.heightAnchor.constraint(equalToConstant: 30)
)]

希望有帮助

编辑:如果这不起作用。获取safeArea并使用其约束

let safeArea = innerView.safeAreaLayoutGuide

NSLayoutConstraint.activate([
  headingLbl.topAnchor.constraint(equalTo: safeArea.topAnchor, constant: 20),
  headingLbl.leadingAnchor.constraint(equalTo: safeArea.leadingAnchor, constant: 20),
  headingLbl.trailingAnchor.constraint(equalTo: safeArea.trailingAnchor, constant: -20),
  headingLbl.heightAnchor.constraint(equalToConstant: 30)
)]

Deepak Bhardwaj 2 年前

使用safeAreaInsets

enter code here

var innerView=UIView()

enter code here
override func viewDidLoad() {
    super.viewDidLoad()
    let safeAreaInsets = view.safeAreaInsets

    innerView = UIView(frame: CGRect(x: safeAreaInsets.left,
                                     y: safeAreaInsets.top,
                                     width: view.frame.width - safeAreaInsets.left - safeAreaInsets.right,
                                     height: view.frame.height - safeAreaInsets.top - safeAreaInsets.bottom))
    self.view.addSubview(innerView)
    let headingLbl = UILabel(frame: CGRect(x:  20, y: 20, width: innerView.frame.width - 40, height: 30))
    headingLbl.font = UIFont(name: "Inter-Bold", size: 20);
    headingLbl.text = "What are your goals?"
    headingLbl.textAlignment = .center
    headingLbl.textColor = .black
    innerView.addSubview(headingLbl)
    innerView.backgroundColor = .red
    self.view.addSubview(innerView)

}
override func viewDidLayoutSubviews() {
     super.viewDidLayoutSubviews()

     // Adjust the frame after layout to account for any changes in safe area insets
     if let customView = view.subviews.first {
         let safeAreaInsets = view.safeAreaInsets
         customView.frame = CGRect(x: safeAreaInsets.left,
                                   y: safeAreaInsets.top,
                                   width: view.frame.width - safeAreaInsets.left - safeAreaInsets.right,
                                   height: view.frame.height - safeAreaInsets.top - safeAreaInsets.bottom)
     }
 }