我在 Swift 中以編程方式為標簽設定約束時遇到問題。我希望標簽填滿整個螢屏。但我不知道該怎么做。
感謝您的幫助。
uj5u.com熱心網友回復：
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let label = UILabel()
label.text = "Hello"
label.backgroundColor = UIColor.yellow
self.view.addSubview(label)
label.translatesAutoresizingMaskIntoConstraints = false
let width: NSLayoutConstraint
width = label.widthAnchor.constraint(equalTo: self.view.widthAnchor, multiplier: 1)
let top: NSLayoutConstraint
top = label.topAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.topAnchor)
let bottom: NSLayoutConstraint
bottom = label.bottomAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.bottomAnchor)
width.isActive = true
bottom.isActive = true
top.isActive = true
}
}
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