How to get UILabel width when it's compute by constraints - swift

Question

I wan't to draw tags on the screen and put them from left to the right and in the case where there are too many for 1 line go to the newline. Like this :
Currently I'm stuck I don't know how to get the width of label after it's compute by constraints. I need to find tagWidth
enum TagPosition {
case left_top
case left
case top
case other
}
func createProductTags() {
var lineWidth: CGFloat = 8.0
var line = 0
var lastTag: UIView = self.contentView
var position = TagPosition.other
var viewAbove = self.contentView
for i in 0..<menu.tagName.count {
if (line == 0 && lineWidth == 8.0) {
position = TagPosition.left_top
} else if (line == 0) {
position = TagPosition.top
} else if (lineWidth == 8.0) {
position = TagPosition.left
} else {
position = TagPosition.other
}
self.tag = setTagSettings(named: menu.tagName[i], position: position)
var tagConstraints = setTagConstraints(lastTag: lastTag, viewAbove: viewAbove, position: position)
lineWidth += tagWidth + 8.0
if (lineWidth > self.contentView.bounds.width - 16) {
viewAbove = lastTag
updateConstraintWhenNewLine(tagConstraints: &tagConstraints, viewAbove: viewAbove)
line += 1
lineWidth = tagWidth + 16.0
}
lastTag = self.tag
}
// To fit the contentView to the last line of tags
lastTag.bottomAnchor.constraint(equalTo: self.contentView.bottomAnchor).isActive = true
}
func updateConstraintWhenNewLine(tagConstraints: inout [NSLayoutConstraint], viewAbove: UIView) {
// Change constraints of last label of the line if it doesn't fit on the line
//Remove old contraints
topConstraint.isActive = false
leftConstraint.isActive = false
tagConstraints.remove(object: topConstraint)
tagConstraints.remove(object: leftConstraint)
self.tag.removeConstraints([topConstraint, leftConstraint])
//Add old contraints
topConstraint = self.tag.topAnchor.constraint(equalTo: viewAbove.bottomAnchor, constant: 8)
leftConstraint = self.tag.leftAnchor.constraint(equalTo: self.contentView.leftAnchor, constant: 16)
tagConstraints.append(contentsOf: [topConstraint, leftConstraint])
NSLayoutConstraint.activate([topConstraint, leftConstraint])
}
func setTagSettings(named tagName: String, position: TagPosition) -> UIView {
// tagContainer settings
let tagContainer = UIView()
tagContainer.backgroundColor = DiscoderyAppSettings.sharedInstance.primaryColor
tagContainer.layer.masksToBounds = true
tagContainer.layer.cornerRadius = self.tagHeight / 2
tagContainer.translatesAutoresizingMaskIntoConstraints = false
self.contentView.addSubview(tagContainer)
// tagLabel settings
let tagLabel = UILabel()
tagLabel.text = tagName
tagLabel.font?.withSize(16.0)
tagLabel.textColor = UIColor.white
tagLabel.textAlignment = .center
tagLabel.translatesAutoresizingMaskIntoConstraints = false
tagContainer.addSubview(tagLabel)
// tagLabel constraints
tagLabel.topAnchor.constraint(equalTo: tagContainer.topAnchor).isActive = true
tagLabel.leftAnchor.constraint(equalTo: tagContainer.leftAnchor, constant: 8).isActive = true
tagLabel.rightAnchor.constraint(equalTo: tagContainer.rightAnchor, constant: -8).isActive = true
tagLabel.bottomAnchor.constraint(equalTo: tagContainer.bottomAnchor).isActive = true
return tagContainer
}
func setTagConstraints(lastTag: UIView, viewAbove: UIView, position: TagPosition) -> [NSLayoutConstraint] {
var tagConstraints: [NSLayoutConstraint] = [NSLayoutConstraint]()
heightConstraint = self.tag.heightAnchor.constraint(equalToConstant: tagHeight)
switch position {
case .left_top:
topConstraint = self.tag.topAnchor.constraint(equalTo: self.contentView.topAnchor)
leftConstraint = self.tag.leftAnchor.constraint(equalTo: self.contentView.leftAnchor, constant: 16)
case .left:
topConstraint = self.tag.topAnchor.constraint(equalTo: viewAbove.bottomAnchor, constant: 8)
leftConstraint = self.tag.leftAnchor.constraint(equalTo: self.contentView.leftAnchor, constant: 16)
case .top:
topConstraint = self.tag.topAnchor.constraint(equalTo: self.contentView.topAnchor)
leftConstraint = self.tag.leftAnchor.constraint(equalTo: lastTag.rightAnchor, constant: 8)
default:
topConstraint = self.tag.topAnchor.constraint(equalTo: viewAbove.bottomAnchor, constant: 8)
leftConstraint = self.tag.leftAnchor.constraint(equalTo: lastTag.rightAnchor, constant: 8)
}
tagConstraints.append(contentsOf: [heightConstraint, topConstraint, leftConstraint])
NSLayoutConstraint.activate(tagConstraints)
return constraints
}
createProductTags() is called in func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath)
If you need any other detail ask me. Thank you