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ios Swift fatal error: use of unimplemented initializer 'init()'

Posted by: admin November 30, 2017 Leave a comment

Questions:

I’ve been trying very hard, have looked up every similar question pertaining to this issue on StackOverflow and trying them to no avail.

class TimeLineTableViewController: UITableViewController,   
UIImagePickerControllerDelegate, UINavigationControllerDelegate  {

var timelineData = [PFObject]()


required init(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
}

override func viewDidLoad() {

    super.viewDidLoad()

    self.loadData()     


}
 @IBAction func loadData(){
    timelineData.removeAll(keepCapacity: false)

    var findTimelineData:PFQuery = PFQuery(className:"timelineMessages")
    findTimelineData.findObjectsInBackgroundWithBlock
        {
            (objects:[AnyObject]! , error:NSError!) -> Void in
            if error == nil
            {
                self.timelineData = objects.reverse() as [PFObject]


                //let array:NSArray = self.timelineData.reverseObjectEnumerator().allObjects

                // self.timelineData = array as NSMutableArray



                self.tableView.reloadData()
            }
    }
}




override func viewDidAppear(animated: Bool) {



    var footerView:UIView = UIView(frame: CGRectMake(0, 0, self.view.frame.size.width, 50))
    self.tableView.tableFooterView = footerView

    var logoutButton:UIButton = UIButton.buttonWithType(UIButtonType.System) as UIButton
    logoutButton.frame = CGRectMake(20, 10, 50, 20)
    logoutButton.setTitle("Logout", forState: UIControlState.Normal)
    logoutButton.addTarget(self, action:"logout:", forControlEvents: UIControlEvents.TouchUpInside)

    footerView.addSubview(logoutButton)

}

To clarify, timelineTableViewController has one class that inherits, MessageTableCell. It’s also part of a project that I’ve integrated into Objective-C code, so it’s a combination of both Swift and ObjC. I’ve run both projects (the swift one and the ObjC one) independently and they work fine; it’s only when I try to run it together do they mess up. Any suggestions? I’m at an utter loss for this.

Answers:

“Unlike subclasses in Objective-C, Swift subclasses do not inherit their superclass initializers by default.”

Automatic Initializer Inheritance

  • Rule 1:
    If your subclass doesn’t define any designated initializers, it automatically inherits all of its superclass designated initializers.
  • Rule 2:
    If your subclass provides an implementation of all of its superclass designated initializers—either by inheriting them as per rule 1, or by providing a custom implementation as part of its definition—then it automatically inherits all of the superclass convenience initializers.

Excerpt From: Apple Inc. “The Swift Programming Language.” iBooks. https://itun.es/tw/jEUH0.l

Since you have override the init(coder aDecoder: NSCoder), TimeLineTableViewController won’t have the init() initiailzer.

You can provide an implementation of all of its superclass designated initialisers like this

override init() {
        super.init()
}

override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: NSBundle?) {
        super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
}

required init(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
}

, or just delete the implementation of init(coder aDecoder: NSCoder).