Why ImageView has was wrong location when I use anchors programmatically? - ios

Question

everyone. I have problems with the collection view cell which I build programmatically using anchors.
Cell
private lazy var iconView: UIImageView = {
let image = UIImageView()
image.translatesAutoresizingMaskIntoConstraints = false
image.clipsToBounds = true
return image
}()
private lazy var label: UILabel = {
let label = UILabel()
label.numberOfLines = 2
label.font = NeoSansPro.regular.of(size: 12)
label.textAlignment = .center
label.translatesAutoresizingMaskIntoConstraints = false
label.sizeToFit()
return label
}()
Config anchor
override func layoutSubviews() {
super.layoutSubviews()
setupUI()
}
func setupUI() {
NSLayoutConstraint.activate( [
iconView.heightAnchor.constraint(equalToConstant: 32),
iconView.widthAnchor.constraint(equalToConstant: 32),
iconView.centerXAnchor.constraint(equalTo: centerXAnchor, constant: 0),
iconView.centerYAnchor.constraint(equalTo: centerYAnchor, constant: -16),
label.topAnchor.constraint(equalTo: iconView.bottomAnchor, constant: 8),
label.bottomAnchor.constraint(equalTo: bottomAnchor, constant: 4),
label.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 4),
label.trailingAnchor.constraint(equalTo: trailingAnchor, constant: 4),
])
}
as the result 1 and 9 cells has wrong image location and label width biggest that cell width.

Answer 1

Add views first then add constraints it will work.
private lazy var iconView: UIImageView = {
let image = UIImageView()
image.translatesAutoresizingMaskIntoConstraints = false
image.image = UIImage(named: "1")
return image
}()
override func awakeFromNib() {
super.awakeFromNib()
backView.layer.cornerRadius = 5
self.contentView.addSubview(iconView)
setUpView()
}
func setUpView() {
NSLayoutConstraint.activate( [
iconView.heightAnchor.constraint(equalToConstant: 40),
iconView.widthAnchor.constraint(equalToConstant: 40),
iconView.centerXAnchor.constraint(equalTo: self.contentView.centerXAnchor, constant: 0),
iconView.centerYAnchor.constraint(equalTo: self.contentView.centerYAnchor, constant: -16)
])
}