Thread 1 EXC_BAD_ACCESS when loading custom UIView from .xib file - swift

Question

I am trying to load a number of custom UIViews from a .xib file into a UIScrollView and I keep getting "Thread 1: EXC_BAD_ACCESS".
Since it's the first time when I'm actually trying to load a custom UIView (done this many times for UICollectionView and UITableView cells), I've been following this tutorial.
class PreSignupDataQuestionView : NibView
{
#IBOutlet weak var vMainContainer: UIView!
#IBOutlet weak var vQuestionViewContainer: UIView!
#IBOutlet weak var ivQuestionViewImage: UIImageView!
#IBOutlet weak var lblQuestion: UILabel!
}
class NibView : UIView
{
var view: UIView!
override init(frame: CGRect)
{
super.init(frame: frame)
xibSetup()
}
required init?(coder aDecoder: NSCoder)
{
super.init(coder: aDecoder)
xibSetup()
}
}
private extension NibView
{
func xibSetup()
{
backgroundColor = UIColor.clear
view = loadNib()
view.frame = bounds
addSubview(view)
view.translatesAutoresizingMaskIntoConstraints = false
addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|[childView]|",
options: [],
metrics: nil,
views: ["childView": view!]))
addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|[childView]|",
options: [],
metrics: nil,
views: ["childView": view!]))
}
}
extension UIView
{
func loadNib() -> UIView
{
let bundle = Bundle(for: type(of: self))
let nibName = type(of: self).description().components(separatedBy: ".").last!
let nib = UINib(nibName: nibName, bundle: bundle)
// Error pops here
return nib.instantiate(withOwner: self, options: nil).first as! UIView
}
}
Inside my UIViewController I have a function that sets up the UIScrollView and it works fine until I try to load the custom UIView.
for index in 0..<self.screenData.count
{
let xCoordinate = (CGFloat(index) * (width)) + firstSpace
let viewFrame = CGRect(x: xCoordinate, y: 0, width: width - spaceBetweenView, height: height)
let childView = PreSignupDataQuestionView().loadNib() as! PreSignupDataQuestionView
childView.frame = viewFrame
childView.tag = index
childView.isUserInteractionEnabled = true
childView.ivQuestionViewImage.image = UIImage(named: "PlaceholderImage")
childView.lblQuestion.text = "Lorep Ipsum"
self.svQuestions.addSubview(childView)
}
However, I have no problem loading a UIView if there is no .xib involved:
let xCoordinate = (CGFloat(index) * (width)) + firstSpace + lastSpace
let viewFrame = CGRect(x: xCoordinate, y: 0, width: width - spaceBetweenView, height: height)
let childView = UIView()
childView.tag = index
childView.isUserInteractionEnabled = true
if index % 2 == 0 { childView.backgroundColor = .red }
else { childView.backgroundColor = .green }
childView.frame = viewFrame
self.scrollView.addSubview(childView)
Any ideas? I've been trying to load a custom UIView into a UIScrollView for some time now and can't seem to figure this out.
I know this is a common issue but so far nothing worked for me.

Answer 1

That tutorial isn't quite right...
When loading the custom view - your PreSignupDataQuestionView - via code, change this line:
let childView = PreSignupDataQuestionView().loadNib() as! PreSignupDataQuestionView
to simply:
let childView = PreSignupDataQuestionView()
That should take care of it.
EDIT:
Try this in a new view controller, to rule out any other possible issues:
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let childView = PreSignupDataQuestionView()
childView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(childView)
NSLayoutConstraint.activate([
childView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 100),
childView.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor, constant: 50),
childView.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor, constant: -50),
childView.heightAnchor.constraint(equalToConstant: 300),
])
}
}
EDIT 2:
I posted a complete sample project at https://github.com/DonMag/XIBLoadExtension
See if that works for you. If so, then compare to what you've got to see what's different.