UILabel子类使用自定义颜色初始化

Question

我的目标是在视图控制器中设置自定义textColor子类的UILabel。我有一个名为UILabel的CircleLabel子类。这是它的基础：

class CircleLabel: UILabel {

required init(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)!
}

override init(frame: CGRect) {
    super.init(frame: frame)
}

override func drawRect(rect: CGRect) {
    self.layer.cornerRadius = self.bounds.width/2
    self.clipsToBounds = true
    super.drawRect(rect)
}

override func drawTextInRect(rect: CGRect) {
    self.textColor = UIColor.whiteColor()
    super.drawTextInRect(rect)
}

func setProperties(borderWidth: Float, borderColor: UIColor) {
    self.layer.borderWidth = CGFloat(borderWidth)
    self.layer.borderColor = borderColor.CGColor
}

}

如您所见，我实例化的每个CircleLabel默认为UIColor.whiteColor（）的textColor属性，该属性可以正常工作。在我的视图控制器的viewDidLoad中，我想将CircleLabel设置为具有动态textColor属性。所以像这样：

class myViewController: UIViewController {
    @IBOutlet weak var myCustomLabel: CircleLabel!

    override func viewDidLoad() {
        super.viewDidLoad()
        myCustomLabel.textColor = UIColor.blackColor()
}

这不起作用，因为在textColor子类的drawRect方法中设置了UILabel。我可以在CircleLabel子类中实现什么（通过诸如setProperties helper方法之类的帮助器方法或其他方式），以允许我在视图控制器中设置自定义标签的textColor？

Answer 1

截图

您无需重写drawRect，只需创建这样的类

class CircleLabel: UILabel {

    required init(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)!
        self.commonInit()

    }

    override init(frame: CGRect) {
        super.init(frame: frame)
        self.commonInit()
    }
    func commonInit(){
        self.layer.cornerRadius = self.bounds.width/2
        self.clipsToBounds = true
        self.textColor = UIColor.whiteColor()
        self.setProperties(1.0, borderColor:UIColor.blackColor())
    }
    func setProperties(borderWidth: Float, borderColor: UIColor) {
        self.layer.borderWidth = CGFloat(borderWidth)
        self.layer.borderColor = borderColor.CGColor
    }
}

然后

class ViewController: UIViewController {

    @IBOutlet weak var myCustomLabel: CircleLabel!
    override func viewDidLoad() {
        super.viewDidLoad()
        myCustomLabel.textColor = UIColor.blackColor()
        // Do any additional setup after loading the view, typically from a nib.
    }

}

Answer 2

1。快速自定义标签

    class CustomLabel: UILabel {

    @IBInspectable var topInset: CGFloat = 5.0
    @IBInspectable var bottomInset: CGFloat = 5.0
    @IBInspectable var leftInset: CGFloat = 7.0
    @IBInspectable var rightInset: CGFloat = 7.0

    override func drawText(in rect: CGRect) {
        let insets = UIEdgeInsets(top: topInset, left: leftInset, bottom: bottomInset, right: rightInset)
        super.drawText(in: rect.inset(by: insets))
    }

    override var intrinsicContentSize: CGSize {
        let size = super.intrinsicContentSize
        return CGSize(width: size.width + leftInset + rightInset,
                      height: size.height + topInset + bottomInset)
    }
}