How can i count time on long-pressed button using UILongPressGestureRecognizer - ios

Question

How can I count time on how long the button is pressed using UILongPressGestureRecognizer; I am looking to print the long-Pressed count time in the displayLabel.text
I've tried most possible way.
#IBOutlet weak var buttonPressed: UIButton!
#IBOutlet weak var displayLabel: UILabel!
var buttonPressedCount : Int = 0
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
let longPressObj = UILongPressGestureRecognizer(target: self, action: #selector(longPressButton))
longPressObj.minimumPressDuration = 2
longPressObj.numberOfTouchesRequired = 1
self.view.addGestureRecognizer(longPressObj)
// below statement is not a right one but i tried many possiblity including this one.
if longPressObj.minimumPressDuration == TimeInterval(2) {
displayLabel.text = "Longpressed for 2 seconds"
} else if longPressObj.minimumPressDuration == TimeInterval(3) {
displayLabel.text = "3"
} else if longPressObj.minimumPressDuration == TimeInterval(3) {
displayLabel.text = "4"
}
}
#IBAction func longPressButton() {
displayLabel.text = "Button pressed for \(buttonPressedCount)"
}
I want to display time of the long-Pressed NOT BUTTON CLICKED.
enter image description here
Thank you in advance!
EDITS:-
1. I just want to show the Running duration while the user is performed Long-Press. I would really appreciate the real-time count in the
2. Also is it will be helpful to show the total duration after stop pressing.
(https://i.stack.imgur.com/ppr0W.png)

Answer 1

Your target function should include sender, then you can get the state of the UILongPressGestureRecognizer.
Here is the Apple official document.
First save the gesture begin time, then you can use the current time to subtract the begin pressed time to get the duration in state .ended (or/and .cancelled, .failed).
Sample code:
class ViewController: UIViewController {
var touchBeginTime: Double = 0
var touchCountTimer: Timer?
override func viewDidLoad() {
super.viewDidLoad()
let longPressObj = UILongPressGestureRecognizer(target: self, action: #selector(longPressButton(sender:)))
longPressObj.minimumPressDuration = 2
longPressObj.numberOfTouchesRequired = 1
self.view.addGestureRecognizer(longPressObj)
}
#IBAction func longPressButton(sender: UILongPressGestureRecognizer) {
switch sender.state {
case .began:
touchCountTimer = Timer.scheduledTimer(withTimeInterval: 0.1, repeats: true, block: { (timer) in
print("User pressing \(Date().timeIntervalSince1970 - self.touchBeginTime) sec.")
})
touchBeginTime = Date().timeIntervalSince1970
break;
case .changed:
//print("Long pressed changed \(Date().timeIntervalSince1970 - touchBeginTime)")
break;
case .ended, .cancelled, .failed:
touchCountTimer?.invalidate()
print("User pressed total \(Date().timeIntervalSince1970 - touchBeginTime) sec.")
break;
default:
break;
}
}
}

Answer 2

Since you want to show the running duration while the long press is being performed, you need to use a timer.
Start the timer when the long press reaches the .began state and stop (invalidate) the timer when the long press reaches the .ended or .canceled state.
Your time should repeat every second and update the label based on the difference between the current date and the date the long press began.

Answer 3

Rather than using a long press gesture recognizer, why not attach button actions to the touchDownInside event and the touchUpInside and touchUpOutside events on your button. your touchDownInside code can start your timer, which would update the label. The touchUpInside/touchUpOutside action would stop the timer.