Nib IBOutlet causes app to crash

Question

Really need your help! I've been through every possible post addressing this issue and nothing seems to work.

So I'm using a .xib file to create a subview within ProfileFoldingCellView.swift, which works perfectly until I attempt to add an IBOutlet in the same class. Here's the code:

import Foundation
import UIKit

class ProfileFoldingCellView: UIView {

    @IBOutlet var mainLabel: UILabel!
    public var cellIndex: Int = 0

    init(index: Int) {
        super.init(frame: CGRect(x: 0, y: 0, width: 0, height: 0))

        cellIndex = index
        print("Index: \(cellIndex)")

        setupContentView()
    }

    func setupContentView() {
        let contentView = UINib(nibName: "ProfileFoldingCellView", bundle: nil).instantiate(withOwner: nil, options: nil)[0] as! UIView
        contentView.autoresizingMask = [.flexibleWidth, .flexibleHeight]

        addSubview(contentView)
    }

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

}

As you can see, the label IBOutlet is created without any issues and there are no other outdated or unused outlets roaming around.

https://i.sstatic.net/5y7Ra.jpg

I've also made sure to set ProfileFoldingCellView.swift as the file owner's class.

Everything runs perfectly until I link the outlet! Then I get this error:

https://i.sstatic.net/ROcr4.jpg

Trust me, I've tried everything. I've probably re-created the outlet a million times, nothing is working. Any help would be greatly appreciated!

Observer

Answer 1

Leave your File's Owner as NSObject and set your view class as ProfileFoldingCellView, your mainLabel should be connected to the UIView object and not File's Owner

Libelee

Ok, this is definitely a step in the right direction. No error, but now the .xib UIView isn't displaying. – Observer

Correction, it crashes with this error imgur.com/a/f7305. The command line just says "(lldb)" – Observer

Would you have a possible solution? – Observer

Man, I've been in this bug for 3 hours and you saved me. Damn it. – Exemplify

Answer 2

I fixed it!

I simply switched the line

let contentView = UINib(nibName: "ProfileFoldingCellView", bundle: nil).instantiate(withOwner: nil, options: nil)[0] as! UIView

with the following:

let contentView = Bundle.main.loadNibNamed("ProfileFoldingCellView", owner: self, options: nil)?[0] as! UIView

I kept the file owner's class as ProfileFoldingCellView

Observer

Answer 3

According to the image you posted, your mainLabel outlet is not connected to the label... It's connected to the files owner object which is probably your cell view and not a UILabel.

Bourbonism

I tried doing that, but now the .xib UIView isn't displaying. – Observer

What I would do in this case is create a nib file for the entire UITableViewCell and if you need your ProfileFoldingCellView you can build it in there. UITableView includes func register(_ nib: UINib?, forCellReuseIdentifier identifier: String) which allows you to more easily register a nib to use to create table view cells. – Bourbonism

Would this be the only solution? – Observer

Answer 4

The answer is already mentioned in the upper section. I just want to illustrate it with images so that it can be more understandable.

Step1: Do not assign the class to the file owner and leave it as NSObject

Step2: Select your main view and Assign the class to that view

Step3: Now connect your outlet

Now it will not cause any kind of error related to IBOutlet :)

Lacedaemonian