ios - 无法更改以编程方式创建的 UILabel 中的文本大小

Question

我无法更改以编程方式创建的 UILabel 中文本的大小。

这是一个屏幕截图:

这是类定义:

class myView: UIView {
    let theLabel = UILabel()

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        self.theLabel.text = "Text"
        self.theLabel.backgroundColor = UIColor.lightGray
        self.backgroundColor = UIColor.blue

        self.theLabel.adjustsFontSizeToFitWidth = true
        self.theLabel.textAlignment = .center
        self.theLabel.numberOfLines = 1
        self.theLabel.minimumScaleFactor = 0.1
        self.theLabel.font = UIFont( name: "System", size:160)
        self.theLabel.translatesAutoresizingMaskIntoConstraints = false
        self.addSubview(self.theLabel)

        let selfAspectConstraint = NSLayoutConstraint(item: self, attribute: NSLayoutAttribute.height, relatedBy: NSLayoutRelation.equal, toItem: self, attribute: NSLayoutAttribute.width, multiplier: 1.0, constant: 0)

        let labelWidthConstraint = NSLayoutConstraint(item: self.theLabel, attribute: NSLayoutAttribute.width, relatedBy: NSLayoutRelation.equal, toItem: self, attribute: NSLayoutAttribute.width, multiplier: 0.5, constant: 0)

        let heightConstraint = NSLayoutConstraint(item: self.theLabel, attribute: NSLayoutAttribute.height, relatedBy: NSLayoutRelation.equal, toItem: self.theLabel, attribute: NSLayoutAttribute.width, multiplier: 0.5, constant: 0)

        let xConstraint = NSLayoutConstraint(item: self.theLabel, attribute: .centerX, relatedBy: .equal, toItem: self, attribute: .centerX, multiplier: 1, constant: 0)

        let yConstraint = NSLayoutConstraint(item: self.theLabel, attribute: .centerY, relatedBy: .equal, toItem: self, attribute: .centerY, multiplier: 1, constant: 0)

        self.addConstraints([selfAspectConstraint,labelWidthConstraint, heightConstraint,xConstraint,yConstraint])
    }
    /*
    // Only override draw() if you perform custom drawing.
    // An empty implementation adversely affects performance during animation.
    override func draw(_ rect: CGRect) {
        // Drawing code
    }
    */
}

我试过更改字体大小。我已将 adjustsFontSizeToFitWidth 设置为 true 并设置 minimumScaleFactor。文本大小始终相同。我希望它填满标签区域，即灰色框。

我如何让它工作？

Answer 1

尝试在设置字体后添加这一行: self.theLabel.font = theLabel.font.withSize(45)