How to implement two inits with same content without code duplication in Swift?

Question

Assume a class that is derived from UIView as follows:

class MyView: UIView {
    var myImageView: UIImageView

    init(frame: CGRect) {
               


        

Answer 1

Does it necessarily have to come before? I think this is one of the things implicitly unwrapped optionals can be used for:

class MyView: UIView {
    var myImageView: UIImageView!

    init(frame: CGRect) {
        super.init(frame: frame)
        self.commonInit()
    }

    init(coder aDecoder: NSCoder!) {
        super.init(coder: aDecoder)
        self.commonInit()
    }

    func commonInit() {
        self.myImageView = UIImageView(frame: CGRectZero)
        self.myImageView.contentMode = UIViewContentMode.ScaleAspectFill
    }

    ...
}

Implicitly unwrapped optionals allow you skip variable assignment before you call super. However, you can still access them like normal variables:

var image: UIImageView = self.myImageView // no error