Obtaining UILabel width when not occupying full screen width? - swift

Question

I would like to obtain the width of a UILabel added as a subView inside a custom TableView Cell. The TableView Class I am using is listed below:
import UIKit
class customTableViewCell: UITableViewCell {
let customLabel: UILabel = {
let label = UILabel()
label.translateAutoConstraints = false
label.textAlignment = .left
return label
}()
override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
super.init(style: style, reuseIdentifier: reuseIdentifier)
contentView.addSubview(customLabel)
customLabel.topAnchor.constraint(equal: contentView.topAnchor).isActive = true
customLabel.leftAnchor.constraint(equal: contentView.leftAnchor, constant: 10).isActive = true
customLabel.rightAnchor.constraint(equal: contentView.rightAnchor, constant: (contentView.frame.size.width/2)-10-customLabel.frame.size.width).isActive = true
}
required init?(coder aDecoder: NSCoder) {
fatalError(“init(coder:) has not been implemented”)
}
}
However, from the above code when I assigned the rightAnchor constraint for the customLabel UILabel, Xcode did not return the correct width of the UILabel I was looking for.
I understand that I only specified the top and left constraints for the UILabel. I also know that UILabel by default has intrinsic layout on, that it can decide on the required height based on the content of the UILabel. However, I am wondering if I did not set the numberOfLines for the customUILabel defined in the above code as 0 (i.e., I only want my text inside the UILabel to occupy one line only). Can I obtain the width of the customUILabel before the text got truncated.
Let me explain further, if my customLabel has a lot of text, it will occupy the full width of the screen then gets truncated. However, if it does not contain a lot of text, then it’s width will be less than the width of the screen. And this is exactly what I am interested in obtaining, the width of the UILabel used to display the small text inside it?
Regards,
Shadi.

Answer 1

You need
self.contentView.rightAnchor.constraintGreaterThanOrEqualToAnchor(customLabel.rightAnchor, constant: 8.0).active = true
Then print the width inside
override func layoutSubviews() {
super.layoutSubviews()
print(customLabel.frame.width)
}
Don't use frames in constraints calculations
(contentView.frame.size.width/2)-10-customLabel.frame.size.width
Inside cell init they not yet calculated