改变标签的约束

Question

标签文本目前在一个奇怪的中心列中构造自己，但我希望它在屏幕上延伸我可以对约束进行哪些更改？

func setupViews() {
    self.view.addSubview(lblTitle)
    lblTitle.topAnchor.constraint(equalTo: self.view.topAnchor, constant: 150).isActive=true
    lblTitle.centerXAnchor.constraint(equalTo: self.view.centerXAnchor).isActive=true
    lblTitle.widthAnchor.constraint(equalToConstant: 250).isActive=true
    lblTitle.heightAnchor.constraint(equalToConstant: 250).isActive=true
}
let lblTitle: UILabel = {
    let lbl=UILabel()
    lbl.text="Spicy jalapeno bacon ipsum dolor amet picanha porchetta pork   loin short loin turducken biltong."
    lbl.textColor=UIColor.black
    lbl.textAlignment = .left
    lbl.font = UIFont.systemFont(ofSize: 30)
    lbl.adjustsFontSizeToFitWidth = true
    lbl.numberOfLines=0
    lbl.sizeToFit()
    lbl.translatesAutoresizingMaskIntoConstraints=false
    lbl.minimumScaleFactor = 0.1
    return lbl

Answer 1

您正在使用此约束将标签的宽度设置为 250：

lblTitle.widthAnchor.constraint(equalToConstant: 250).isActive=true

将该值更改为您想要的宽度。