Subclassing view controller in Swift - ios

Question

I want to subclass UIViewController and override init methods. I ended up with:
class BaseViewController : UIViewController, BaseViewCreating, ModelBinding {
var viewModel : Any!
convenience init(viewModel: Any){
self.init()
self.createUserInterface()
self.createConstraints()
self.viewModel = viewModel
self.bindWithModel(model: self.viewModel)
}
convenience init() {
self.init()
self.createUserInterface()
self.createConstraints()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func createUserInterface() {
}
func createConstraints() {
}
func bindWithModel(model: Any) {
}
func update(){
self.bindWithModel(model: self.viewModel)
}
}
However, when app launch, it throw an error - EXC_BAD_ACCESS on line self.init() in method convenience init().
How to fix that?

Answer 1

Thats because you are calling init recursively with self.init inside
convenience init() {
self.init()
}
Every single Convenience init should call designated initializer of the class. UIViewController has
public init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?)
public init?(coder aDecoder: NSCoder)
as designated initializer. So you should call any one of them in your init() or override them in your ViewController and later call self.init(nibName or self.init(coder
As it cant find designated initializer by name init() it is calling recursively your init hence crashing
EDIT:
Just in case anybody has a doubt that self.init will not result in loop because thats one of the way how a Convenience initializer can call designated initializer. I have explained in detail why it results in infinite loop in this specific case in comment below :) attaching a proof here
This is the stack trace when I ran OP code. Clearly shows infinite recursive call

Answer 2

If anyone face same problem i paste answer here:
You should add this to your subclas:
init() {
super.init(nibName:nil, bundle:nil)
self.createUserInterface()
self.createConstraints()
}