IB Designables: Failed to render and update auto l

Question

I have a custom view (xib) that has a UIButton inside of it, I made id IBDesignable doing the following:

UserView.swift

import UIKit

@IBDesignable
class UserView: UIView {

    @IBOutlet var view: UIView!
    @IBOutlet weak var userButton: UIButton!

    override init(frame: CGRect) {
        super.init(frame: frame)
        load()

    }

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

    fileprivate func load() {
        Bundle.main.loadNibNamed("UserView", owner: self, options: nil)
        addSubview(view)
        self.frame = bounds
    }

}

UserView.xib

• Added the UIButton and set constraints
• Set the File's Owner: UserView

Storyboard

I added a UIView to a Bar Button Item and assigned UserView class but nothing is rendering, and I got the following build error:

error: IB Designables: Failed to render and update auto layout status for FoodViewController (bR3-Kz-wX7): The agent threw an exception.

My currently environment: Xcode 9, Swift 4

Answer 1

I'm cringing at how dumb this is that doing what I'm about to tell you makes a difference, but you can try removing the breaking code out of

override func prepareForInterfaceBuilder() {

and only use it in

override func awakeFromNib() {

. I'm cringing, even more, when I report that its possible that your changes could still reflect in storyboard as desired when doing this.

You can identify the breaking code by commenting out all the lines and using a process of elimination to identify the breaking line.