Create Instance of Subclass that requires NSCoder - ios

Question

I have created a subclass of UILabel, based on an example from here: UILabel doesn't show inputView. I am trying to create an instance of the label inside a class that subclasses UITableViewCell. The issue I am having is that to create an instance of DatePickerLabel it requires an NSCoder.
let dp = DatePickerLabel(coder: NSCoder)
I have this in my class that subclasses UITableViewCell but it doesn't seem to ever be triggered, leading to a null pointer when I run it (I tried using a variable and then assigning it inside this code):
required public init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
print("triggered")
}
Any help is greatly appreciated, DatePickerLabel shown below!
class DatePickerLabel: UILabel {
private let _inputView: UIView? = {
let picker = UIDatePicker()
return picker
}()
private let _inputAccessoryToolbar: UIToolbar = {
let toolBar = UIToolbar()
toolBar.barStyle = UIBarStyle.default
toolBar.isTranslucent = true
toolBar.sizeToFit()
return toolBar
}()
override var inputView: UIView? {
return _inputView
}
override var inputAccessoryView: UIView? {
return _inputAccessoryToolbar
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
let doneButton = UIBarButtonItem(title: "Done", style: UIBarButtonItemStyle.plain, target: self, action: #selector(doneClick))
let spaceButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.flexibleSpace, target: nil, action: nil)
_inputAccessoryToolbar.setItems([ spaceButton, doneButton], animated: false)
let tapRecognizer = UITapGestureRecognizer(target: self, action: #selector(launchPicker))
self.addGestureRecognizer(tapRecognizer)
}
override var canBecomeFirstResponder: Bool {
return true
}
#objc private func launchPicker() {
becomeFirstResponder()
}
#objc private func doneClick() {
resignFirstResponder()
}
}
Cheers!

Answer 1

In the question you linked to, the initialisation function was initWithCoder because that it used to load views from a storyboard or nib. You are not doing that.
So, change your init to a “plain” one, like:
init() {
super.init()
...
}