gistfile1.swift

class SSNTextField: UITextField {
    
    
    required init(coder aDecoder: NSCoder) {
        
        super.init(coder: aDecoder)
        registerForNotifications()
    }
    
    
    override init(frame: CGRect) {
        
        super.init(frame: frame)
        registerForNotifications()
    }
    
    
    deinit {
        
        NSNotificationCenter.defaultCenter().removeObserver(self)
    }
    
    
    private func registerForNotifications() {
        
        NSNotificationCenter.defaultCenter().addObserver(self, selector: "textDidChange", name: "UITextFieldTextDidChangeNotification", object: self)
    }
}