ios – UILabel子类使用自定义颜色初始化

我的目标是在我的视图控制器中设置我的自定义UILabel子类的textColor.我有一个名为CircleLabel的UILabel子类.以下是它的基础知识：

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都默认为UIColor.whiteColor()的textColor属性,该属性正常工作.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.所以这样的事情：

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

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

这不起作用,因为textColor是在UILabel子类的drawRect方法中设置的.我可以在我的CircleLabel子类中实现什么(通过帮助器方法,比如我的setProperties帮助器方法或其他方式),这样我可以在视图控制器中设置自定义标签的textColor？

解决方法

截图

在您的情况下,您不需要覆盖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.
}

}