How do I switch my play button to a pause button in Swift? - swift

Question

working on my first stopwatch app.
I currently have a play button, pause button, and stop button.
I'd like to combine the play and pause button so that they switch back and forth.
My code looks like this:
var timer = NSTimer()
var count = 0
func updateTime() {
count++
time.text = "\(count)"
}
#IBAction func pauseButton(sender: AnyObject) {
timer.invalidate()
}
#IBOutlet weak var time: UILabel!
#IBAction func stopButton(sender: AnyObject) {
timer.invalidate()
count = 0
time.text = "0"
}
#IBAction func playButton(sender: AnyObject) {
timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("updateTime"), userInfo: nil, repeats: true)
}
Any help is appreciated.

Answer 1

Try adding booleans. See my code below.
#IBOutlet weak var label: UILabel!
var time = NSTimer()
var count = 0
var running = false
func result (){
count++
label.text = String(count)
println(count)
}
#IBAction func playpause(sender: AnyObject) {
if running == false {
time = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("result"), userInfo: nil, repeats: true)
running = true }
else {
time.invalidate()
running = false
}
}
Hope this helps!

Answer 2

You'll have a variable bound to the button, something like this:
#IBOutlet var thePlayPauseButton : UIButton!
This button will be linked with some action:
#IBAction func togglePlayPauseButton (button: UIButton) {
// If we are 'paused', then play:
if button.titleLabel!.text == "Pause" {
button.titleLabel!.text = "Play"
// do actual play ...
timer = NSTimer.scheduledTimerWithTimeInterval (1,
target: self,
selector: Selector("updateTime"),
userInfo: nil,
repeats: true)
}
else if button.titleLabel!.text == "Play" {
button.titleLabel!.text = "Pause"
// do actual pause ...
timer.invalidate()
}
else { /* error */ }
}
Of course, structurally you can use a switch//case and you can perform the toggle behavior by calling your preexisting pause and play methods.

Answer 3

I know this post is somewhat dated, but I was working with the same problem and I came up with a slightly different answer and wanted to share it to help others. Here is what I came up with in toggling the pause and play buttons.
class ViewController: UIViewController {
var time = NSTimer()
var seconds = 0
var running = false
func timer() {
seconds++
timeLabel.text = "\(seconds)"
}
func playing() {
time = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("timer"), userInfo: nil, repeats: true)
running = true
}
func pausing() {
time.invalidate()
running = false
}
#IBOutlet weak var timeLabel: UILabel!
#IBAction func stopButton(sender: AnyObject) {
time.invalidate()
seconds = 0
timeLabel.text = "0"
}
#IBAction func pausePlayToggleButton(sender: AnyObject) {
if running == false {
return playing()
} else {
return pausing()
}
}
I had both a pause and play button and I essentially took their effects and placed them in functions and used them as return values for a single button.