为什么UIView的扩展对放置在IB上的UIView以外的其他控件没有直接影响？

Question

For eg

@IBDesignable extension UIView{
    @IBInspectable var fillColor:UIColor?{
        set{
            backgroundColor=newValue
        }
        get{
            return backgroundColor//UIColor(cgColor: backgroundColor!)
        }
    }
}

I know this is unnecessary but just for checking I have created this and found this is working directly if applied in UIView else its not working.

Can anybody please suggest me am I missing something? I am using swift 3.0.2. Thanks in advance :)

Answer 1

try this

When you are extending a UIView

class AJView:UIView{
    @IBInspectable var fillColor:UIColor? {
       didSet {
           layer.backgroundColor = fillColor.cgColor
       }
    }
}

When Using With extension

     extension BTextField{
    @IBInspectable var fillColor:UIColor? {
        get{
            return self.fillColor
        }
        set {
            layer.backgroundColor = self.fillColor?.cgColor
        }
    }
}

Hope it works. I have edited the answer, you can check now