What we need is a common place to put our initialization code before calling any superclass’s initializers, so what I currently using, shown in a code below. (It also cover the case of interdependence among defaults and keep them constant.)
import UIKit
class MyView: UIView {
let value1: Int
let value2: Int
enum InitMethod {
case coder(NSCoder)
case frame(CGRect)
}
override convenience init(frame: CGRect) {
self.init(.frame(frame))!
}
required convenience init?(coder aDecoder: NSCoder) {
self.init(.coder(aDecoder))
}
private init?(_ initMethod: InitMethod) {
value1 = 1
value2 = value1 * 2 //interdependence among defaults
switch initMethod {
case let .coder(coder): super.init(coder: coder)
case let .frame(frame): super.init(frame: frame)
}
}
}