UIDate Picker valuechanged does not update the first spin, but does every spin after.. iOS

Question

I have a UIDate Picker embedded in a static TableViewCell and at the moment I disabled most of the code except the code responsible for the date picker.

I\'m using t

Answer 1

I don't know if I got your problem, but Date picker works using the target-action pattern and it triggers this mechanism when you change a value.
So if the problem is the very first value shown, you should initialize your variable taking it as the "default" value.

Answer 2

Actually, all you need is to not set datePicker.countDownDuration in viewDidLoad but add it to viewDidAppear, or later.

Answer 3

Similar problem as above, I used

DispatchQueue.main.asyncAfter(deadline: .now()) {
   self.datePicker.countDownDuration = 60
}

to put it on the next runloop. Seems a viable workaround.

Answer 4

Time ago I found another problem that somehow resembles this one. It was about presenting a view controller from within the tableView:didSelectRowAtIndexPath: and the problem was that it was taking lots of time for the new controller to actually show up. One of the workarounds turned out to be using dispatch_async on the main queue. The same worked for me in this case.

In my viewDidLoad, I asynchronously dispatched the picker setup code on the main queue and, in my case, it started to respond to the valueChanged event even on the first pick:

DispatchQueue.main.async {
    self.pickerView.datePickerMode = .countDownTimer
    self.pickerView.minuteInterval = 5
    self.pickerView.countDownDuration = 15
}

Answer 5

I think you should try implement this delegate instead

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component

Answer 6

It seems to be something to do with the animated parameter. You just need this line:

datePicker.setDate(date, animated: true)