Swift - App crahes when create UIImageView programmatically

Question

I am subclassing a UICollectionViewCell, this is what my code looks like

    var homeImageView : UIImageView!

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

    override init(frame: CGRect) {
        super.init(frame: frame)
        self.configure()
    }

    func configure () {
        homeImageView.translatesAutoresizingMaskIntoConstraints = false
        self.addSubview(homeImageView)

        self.setupConstraints()
    }

    func setupConstraints () {
        self.addConstraints([
            self.topAnchor.constraintEqualToAnchor(homeImageView.topAnchor),
            self.leftAnchor.constraintEqualToAnchor(homeImageView.leftAnchor),
            self.rightAnchor.constraintEqualToAnchor(homeImageView.rightAnchor),
            self.bottomAnchor.constraintEqualToAnchor(homeImageView.bottomAnchor)
            ])
    }

My app crashes and I'm getting an error message on this line

homeImageView.translatesAutoresizingMaskIntoConstraints = false

The error message

fatal error: unexpectedly found nil while unwrapping an Optional value

What is causing this? I've tried assigning an image and frame to the imageView but the app still crashes and give the same error.

In Obj-c, I would just use alloc init, set translatesAutoresizingMaskIntoConstraints to NO, add as a subview and setup its constraints and it would work. Why is this not working? What am I doing wrong?

vacawama · Accepted Answer · 2016-09-24 18:04:45Z

2

You are never creating the UIImageView.

Replace:

var homeImageView: UIImageView!

with:

let homeImageView = UIImageView()

answered Sep 24, 2016 at 18:04

vacawama

155k32 gold badges283 silver badges315 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

imstillalive Over a year ago

Working now. Thanks!

Collectives™ on Stack Overflow

Swift - App crahes when create UIImageView programmatically

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related