iOS UIStepper not functioning properly

StackOverflow https://stackoverflow.com/questions/11041221

  •  14-06-2021
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Question

Some simple code: 

- (IBAction)Up_Down:(UIStepper *)sender {
     double value = [sender value];
     [NumDayLabel setText:[NSString stringWithFormat:@"%d", (int)value]];
}

It partially works.

I start it out at five. If I press +, nothing happens. If I press + again, it goes to 6. Then it will continue going up by one each time I press +. Now, if I press + until it reaches 9, then I hit minus, it goes to 10. Then I hit minus again and it goes to 9, then will continue back down so long as I keep pressing minus. If I bring it down to 3, then hit plus, it will go to 2, then start going up so long as I keep pressing +. Hopefully, you get the idea.

Was it helpful?

Solution

Since you are always one value behind it sounds like you may have added the action for UIControlEventTouchUpInside. It fires before the stepper value has changed. The correct event for a UIStepper is UIControlEventValueChanged.

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