Swift proper way to load xib file

Question

I have some strange problem with loading xib file in swift project. It\'s so frustrating because I already know how to do it in Obj-C. But since swift is swift so you can\'t

Answer 1

This works for me:

class IconTextField: UITextField {
    @IBOutlet weak var view: UIView!
    @IBOutlet weak var test: UIButton!

    required init(coder: NSCoder) {
        super.init(coder: coder)
        NSBundle.mainBundle().loadNibNamed("IconTextField", owner: self, options: nil)
        self.addSubview(view)
        assert(test != nil, "the button is conected just like it's supposed to be")
    }
}

Once loadNibNamed:owner:options: is called the view and test button are connected to the outlets as expected. Adding the nib's view self's subview hierarchy makes the nib's contents visible.

Answer 2

I prefer to load from nib, by implementing loadFromNib() function in a protocol extension as follows:

(as explained here: https://stackoverflow.com/a/33424509/845027)

import UIKit

protocol UIViewLoading {}
extension UIView : UIViewLoading {}

extension UIViewLoading where Self : UIView {

  // note that this method returns an instance of type `Self`, rather than UIView
  static func loadFromNib() -> Self {
    let nibName = "\(self)".characters.split{$0 == "."}.map(String.init).last!
    let nib = UINib(nibName: nibName, bundle: nil)
    return nib.instantiateWithOwner(self, options: nil).first as! Self
  }

}

Answer 3

You can use this:

if let customView = Bundle.main.loadNibNamed("MyCustomView", owner: self, options: nil)?.first as? MyCustomView {
        // Set your view here with instantiated customView
}