add tap gesture to a UILabel Programmatically - ios

Question

I am trying to add tap gesture for a dynamically created UILabel in a function in swift 4, but it is not firing UITapGestureRecognizer function. it is working when i add tap gesture from viewDidLoad function, but i have to add tap gesture from other function.
here is the code
override func viewDidLoad() {
super.viewDidLoad()
createLabel()
}
func createLabel() {
let label = UILabel()
label.text = "abc"
label.numberOfLines = 0
label.frame.size.width = self.otherlinksStack.bounds.width
label.font = label.font.withSize(17) // my UIFont extension
label.sizeToFit()
label.tag = 1
self.otherlinksStack.addSubview(label)
let labelTapGesture = UITapGestureRecognizer(target:self,action:#selector(self.doSomethingOnTap))
label.isUserInteractionEnabled = true
label.addGestureRecognizer(labelTapGesture)
}
#objc func doSomethingOnTap() {
print("tapped")
}

Answer 1

You're doing a couple things wrong...
// your code
label.frame.size.width = self.otherlinksStack.bounds.width
label.sizeToFit()
If you're adding the label to a stackView, there is no need to set its frame -- let the stack view handle that. If your stackView's alignment is set to .fill it will stretch the label to its width anyway. If it's not set to fill, the label will expand horizontally as needed, based on its text. So, also, no need to call .sizeToFit().
// your code
self.otherlinksStack.addSubview(label)
When add a view to a stack view, use .addArrangedSubview, otherwise it will be added overlaid on top of another view in the stack view.
This should work fine (it does in my quick test):
func createLabel() {
let label = UILabel()
label.text = "abc"
label.numberOfLines = 0
label.font = label.font.withSize(17) // my UIFont extension
label.tag = 1
// give the label a background color so we can see it
label.backgroundColor = .cyan
// enable user interaction on the label
label.isUserInteractionEnabled = true
// add the label as an Arranged Subview to the stack view
self.otherlinksStack.addArrangedSubview(label)
// create the gesture recognizer
let labelTapGesture = UITapGestureRecognizer(target:self,action:#selector(self.doSomethingOnTap))
// add it to the label
label.addGestureRecognizer(labelTapGesture)
}
#objc func doSomethingOnTap() {
print("tapped")
}

Answer 2

Use this code for adding the Tap Gesture:
let tapGesture: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(tapGestureMethod(_:)))
tapGesture.numberOfTapsRequired = 1
tapGesture.numberOfTouchesRequired = 1
yourLabel.isUserInteractionEnabled = true
yourLabel.addGestureRecognizer(tapGesture)
This is the tap gesture method:
#objc func tapGestureMethod(_ gesture: UITapGestureRecognizer) {
Do your code here
}

Answer 3

func addTapGesture() {
let labelTapGesture = UITapGestureRecognizer(target: self, action: #selector(doSomethingOnTap))
//Add this line to enable user interaction on your label
myLabel.isUserInteractionEnabled = true
myLabel.addGestureRecognizer(labelTapGesture)
}
#objc func doSomethingOnTap() {
print("tapped")
}
Then call addTapGesture() from viewDidLoad or from whichever function you wanna add tap from.

Answer 4

If your gesture works from viewDidLoad, then after adding from other function the gesture might override by other control's gestures..
Try adding gesture on control which is seperate from all other controls.