Add UIView rounding logic inside UIView class - ios

Question

I have a custom UIView and I add it to my ViewController like this:
let myCustomView = Bundle.main.loadNibNamed("MyCustomView", owner: nil, options: nil) as! MyCustomView
myCustomView.layer.cornerRadius = 10
myCustomView.layer.masksToBounds = true
I round the corners of the view. But I am wondering, is there a way to move this logic of rounding the corners inside the MyCustomView class?

Answer 1

As you use IB, you may find it more convenient to make an extension of UIView
extension UIView {
#IBInspectable var borderColor: UIColor? {
set {
layer.borderColor = newValue?.cgColor
}
get {
if let color = layer.borderColor {
return UIColor(cgColor:color)
} else {
return nil
}
}
}
#IBInspectable var borderWidth: CGFloat {
set {
layer.borderWidth = newValue
}
get {
return layer.borderWidth
}
}
#IBInspectable var cornerRadius: CGFloat {
set {
layer.cornerRadius = newValue
clipsToBounds = newValue > 0
}
get {
return layer.cornerRadius
}
}
}
Then you can set those values from Attributes inspector.

Answer 2

Yes - If you're loading a nib with a custom view, that nib is very likely referring to another class. If that's the case, you can move the logic inside the class itself.
That said, I really like Lawliet's suggestion of making a UIView extension with IBInspectable properties. The downside to that approach is that every single view now has these properties, which creates a certain overhead and potential for clashes.

Answer 3

You can do something like this in your UIView subclass:
class RoundedView: UIView {
/*
// Only override draw() if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
override func draw(_ rect: CGRect) {
// Drawing code
}
*/
override init(frame: CGRect) {
super.init(frame: frame)
self.layer.cornerRadius = 10
self.layer.masksToBounds = true
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
self.layer.cornerRadius = 10
self.layer.masksToBounds = true
}
}
Also if you want to pass a custom value instead of '10' in the cornerRadius property, you can try to implement a convenience init by looking here:
Override Init method of UIView in Swift