Unable to create instance of a resuable view - ios

Question

I am using this code:
import UIKit
class SnackBarView: UIView {
#IBOutlet var containerView: UIView!
#IBOutlet var labelText: UILabel!
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
let _ = commonInitialization()
}
func commonInitialization() -> UIView
{
let bundle = Bundle.init(for: type(of: self))
let nib = UINib(nibName: "SnackBarView", bundle: bundle)
let view = nib.instantiate(withOwner: self, options: nil)[0] as! UIView
view.frame = bounds
view.autoresizingMask = [UIViewAutoresizing.flexibleWidth, UIViewAutoresizing.flexibleHeight]
addSubview(view)
return view
}
}
when I try initialising it like this:
let snackBar = SnackBarView()
it gives the error:
Missing argument for parameter 'coder' in call
I know there is something wrong in the init function but I am not sure how to correct this. How should I proceed correcting this?

Answer 1

The error is not in your class but rather in how you are attempting to call it.
Since you want to create the UIView with zero (0) parameters you need to supply it a constructor (init) to deal with that situation when it happens.
Hopefully the below will work to give you a constructor with zero (0) parameters.
class SnackBarView: UIView {
#IBOutlet var containerView: UIView!
#IBOutlet var labelText: UILabel!
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
let _ = commonInitialization()
}
// you need to add this init
override init(frame: CGRect) {
super.init(frame: frame)
// call your custom initialization code here
let _ = commonInitialization()
}
// constructor with zero (0) parameters
convenience init() {
// call the override from above with a default CGRect
self.init(frame: CGRect.zero)
}
func commonInitialization() -> UIView
{
let bundle = Bundle.init(for: type(of: self))
let nib = UINib(nibName: "SnackBarView", bundle: bundle)
let view = nib.instantiate(withOwner: self, options: nil)[0] as! UIView
view.frame = bounds
view.autoresizingMask = [UIViewAutoresizing.flexibleWidth, UIViewAutoresizing.flexibleHeight]
addSubview(view)
return view
}
}

Answer 2

You need to add override init(frame: CGRect) in your view: updated code is below:
class SnackBarView: UIView {
#IBOutlet var containerView: UIView!
#IBOutlet var labelText: UILabel!
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
let _ = commonInitialization()
}
// you need to add this init
override init(frame: CGRect) {
super.init(frame: frame)
}
func commonInitialization() -> UIView
{
let bundle = Bundle.init(for: type(of: self))
let nib = UINib(nibName: "SnackBarView", bundle: bundle)
let view = nib.instantiate(withOwner: self, options: nil)[0] as! UIView
view.frame = bounds
view.autoresizingMask = [UIViewAutoresizing.flexibleWidth, UIViewAutoresizing.flexibleHeight]
addSubview(view)
return view
}
}

Answer 3

I think it's meaningless to create a UIView with xib , and then add an instance of the same type to it as commonInitialization here occupies all frame of itself , I think you need
class SnackBarView: UIView {
#IBOutlet var containerView: UIView!
#IBOutlet var labelText: UILabel!
class func commonInitialization(_ rec:CGRect) -> SnackBarView
{
let nib = UINib(nibName: "SnackBarView", bundle: nil)
let view = nib.instantiate(withOwner: self, options: nil)[0] as! SnackBarView
view.frame = rec
return view
}
}
//
let v = SnackBarView.commonInitialization(view.frame)
view.addSubview(v)