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.
}
}