Cannot set button image inside UIStackView - ios

Question

I have a UICollectionViewCell which has a UIStackView that fills the whole cell.
Inside that UIStackView I am trying to add subviews but I'm running into two problems here.
First one is that I cannot see the UIStackView being added to the cell, even setting the stack view background color to a different one it doesn't show.
The second problem is that my app - in this case it is a Today Extension Widget crashes when I'm instantiating a button image as button.setImage(:_)
Here's the code:
#objc lazy var composeButton: UIButton = {
let button = UIButton(type: .system)
let image = #imageLiteral(resourceName: "compose_icon").withRenderingMode(.alwaysOriginal)
button.setImage(image, for: .normal)
button.addTarget(self, action: #selector(didTapCompose), for: .touchUpInside)
return button
}()
let stackview = UIStackView(arrangedSubviews: [composeButton, reloadButton])
stackview.distribution = .fillEqually
stackview.axis = .horizontal
addSubview(stackview)
stackview.anchor(top: topAnchor, left: leftAnchor, bottom: bottomAnchor, right: rightAnchor, paddingTop: 0, paddinfLeft: 0, paddingBottom: 0, paddingRight: 0, width: 0, height: 0)
extension UIView {
/// Anchor a specific view to a superview
#objc func anchor(top: NSLayoutYAxisAnchor?, left: NSLayoutXAxisAnchor?, bottom: NSLayoutYAxisAnchor?, right: NSLayoutXAxisAnchor?, paddingTop: CGFloat, paddinfLeft: CGFloat, paddingBottom: CGFloat, paddingRight: CGFloat, width: CGFloat, height: CGFloat) {
translatesAutoresizingMaskIntoConstraints = false
if let top = top {
topAnchor.constraint(equalTo: top, constant: paddingTop).isActive = true
}
if let left = left {
leftAnchor.constraint(equalTo: left, constant: paddinfLeft).isActive = true
}
if let bottom = bottom {
bottomAnchor.constraint(equalTo: bottom, constant: -paddingBottom).isActive = true
}
if let right = right {
rightAnchor.constraint(equalTo: right, constant: -paddingRight).isActive = true
}
if width != 0 {
widthAnchor.constraint(equalToConstant: width).isActive = true
}
if height != 0 {
heightAnchor.constraint(equalToConstant: height).isActive = true
}
}
/// Rounds the corners of a UIView object
/// parameters: corners - the corners to round (upperLeft, upperRight, lowerLeft, lowerRight);
/// radiud - the desired cornerRadius to apply to the desired corners
#objc func roundCorners(corners:UIRectCorner, radius: CGFloat) {
let path = UIBezierPath(roundedRect: self.bounds, byRoundingCorners: corners, cornerRadii: CGSize(width: radius, height: radius))
let mask = CAShapeLayer()
mask.path = path.cgPath
self.layer.mask = mask
}
}
The app crashes on this line
button.setImage(image, for: .normal)
It crashes with a SIGABRT error as shown in the image bellow.
Does anyone spot the problem here ?

Answer 1

Since this is part of a Today Extension Widget, make sure you've included the image in that build target.
A future debugging tip: When you see an error that "really shouldn't happen," try thinking about step-by-step. In this case, while the .setImage line appeared to be the culprit, if you had checked the validity of your let image = line, you might have saved a little time.