UILabel子类使用自定义颜色初始化

Question

我的目标是在我的视图控制器中设置textColor我的自定义UILabel子类.我有一个UILabel名为的子类CircleLabel.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,因为在子类textColor的drawRect方法中设置UILabel.我可以在我的CircleLabel子类中实现什么(通过像我的setProperties帮助器方法或其他方式的帮助器方法),这将允许我textColor在视图控制器中设置我的自定义标签？

Answer 1

截图

drawRect在您的情况下,您不需要覆盖,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.
    }

}