Reusable code for classes - ios

Question

Several classes in my app do the same thing and have the same instance variables:
// one of the many classes I have
// they all load nibs and update the frames of their views
class HelpView: UIView {
#IBOutlet var view: UIView!
required init(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)!
NSBundle.mainBundle().loadNibNamed("HelpView", owner: self, options: nil)
self.addSubview(self.view)
self.view.frame = self.bounds
}
}
I want to avoid duplicated code, so I thought about using a superclass so that all the classes inherit from it.
// my new superclass all classes will inherit from
class ReusableView: UIView {
#IBOutlet var view: UIView! // all subclasses have different views
required init(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)!
// every class has a different nib name
NSBundle.mainBundle().loadNibNamed("Nib name goes here", owner: self, options: nil)
self.addSubview(self.view)
self.view.frame = self.bounds
}
}
The problem is that view is nil until the nib is loaded, so it's apparently not possible to call that superclass' method because you're passing a nil object. How can I handle this?

Answer 1

This will work:
class ReusableView: UIView {
func getHelperView() -> UIView! {
preconditionFailure("This method must be overridden")
}
func getNibName() -> String {
preconditionFailure("This method must be overridden")
}
required init(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)!
// every class has a different nib name
NSBundle.mainBundle().loadNibNamed(self.getNibName(), owner: self, options: nil)
self.addSubview(self.getHelperView())
self.getHelperView().frame = self.bounds
}
}
class HelpView: ReusableView {
#IBOutlet var view: UIView!
override func getHelperView() -> UIView! {
return view;
}
override func getNibName() -> String {
return "NibName";
}
}