So, I have a textfield where I setup its delegate. Most of the time it would work as expected, shouldChangeCharacters is called but very few times shouldChangeCharacters is not called.
Now, I thought this could just be a race condition but it only happens on some clean & build runs. And when it does happen, it is very consistent, even if the instance is recreated it still happens consistently. That's why I've ruled it out as a race issue, and think of it as an undefined behavior during compile/machine code creation.
So, my question is do I violate Objc and Swift runtime with how my extensions and protocol conformations are setup? If so, how to resolve?
class LabelAndTextFieldView: UIView{
let textField: UITextField
var delegate: LabelAndTextFieldViewDelegate?{ //strong so it would not dealloc
didSet{
textField.delegate = delegate
}
}
}
extension LabelAndTextFieldView{
class LabelAndTextFieldViewDelegate: NSObject{
//some methods unrelated to uitextfieldDelegate
}
class AmountFormattingTextFieldDelegate: LabelAndTextFieldViewDelegate{
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
//disallow if not numeric
}
}
}
extension LabelAndTextFieldView.LabelAndTextFieldViewDelegate: UITextFieldDelegate{
//other uitextfield delegate methods EXCEPT shouldChangeCharactersInRange
}
//code assignment
class SomeVC{
@IBOutlet weak var labelTextFieldView: LabelAndTextFieldView!
override func viewDidLoad(){
super.viewDidLoad()
labelTextFieldView.delegate = AmountFormattingTextFieldDelegate() //this will not dealloc because intended strong on delegate
}
}
