Swift - Pass inout parameter to scheduledTimer - ios

Question

Is there a way to pass an inout parameter through a scheduledTimer method? I want a specific value(disable Button until timer has run out).
func Timer(Hz:TimeInterval, Activate: inout Bool, time:Double=10){
let info = ProcessInfo.processInfo
let begin = info.systemUptime
var A=0
// do something
var diff = (info.systemUptime - begin)
print("Time runs\n")
let timer=Timer.scheduledTimer(withTimeInterval: Hz, repeats: true) { timer in
diff=(info.systemUptime - begin)
if (diff>=time){
timer.invalidate()
print("Finished")
Activate = !Activate
A=1
}
}
if (A==1){
print("Will never happen")
}
}
Var A is just there to show that I also tried a different approach but it didn't work

Answer 1

If the button is a reference type (ie, a class), which it will be if it's a UIKit or AppKit type, you can just pass it in, but there's a more general way of doing that is maybe better. Pass a closure in to act as a completion handler:
func Timer(Hz:TimeInterval, time:Double=10, onCompletion handler: #escaping () -> Void){
let info = ProcessInfo.processInfo
let begin = info.systemUptime
var A=0
// do something
var diff = (info.systemUptime - begin)
print("Time runs\n")
let timer=Timer.scheduledTimer(withTimeInterval: Hz, repeats: true) { timer in
diff=(info.systemUptime - begin)
if (diff>=time){
timer.invalidate()
print("Finished")
A=1
handler() // <- Call completion handler here
}
}
if (A==1){
print("Will never happen")
}
}
Then you can disable the button like this:
Timer(Hz: hz, time: time) { myButton.isEnabled = false /* or whatever else you want to do */ }

Answer 2

Your code seems unnecessarily complicated (though perhaps I have not understood the goal). Let's say we want to disable our button for 10 seconds, and then it should be enabled again. Then we would just say
self.myButton.isEnabled = false
self.toggleEnabled(self.myButton, after:10)
where toggleEnabled looks like this:
func toggleEnabled(_ enabled:UIButton, after t:Double) {
Timer.scheduledTimer(withTimeInterval: t, repeats: false) { _ in
enabled.isEnabled.toggle()
}
}
If you really wanted to, you could use a protocol to hide from toggleEnabled the fact that this is a UIButton. But that's hardly needed just to do something so simple.