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iosobjective-cuidatepicker

Objective-C: UIDatePicker UIControlEventValueChanged only fired on second selection

Working with UIDatePickers for the first time. To start, I'm just trying to update a text field with whatever value is selected from the datePicker (set in count down mode).

It works, but only the second time that a user selects a time. My action, durationSelected() is only called the second time, so there are no problems updating the textField.

Here's how I configured the date picker in my storyboard:

enter image description here

enter image description here

Here's the action triggered on Value Changed:

from DetailViewController.m

- (IBAction)durationSelected:(UIDatePicker *)sender
{
    self.durationTextField.text = [NSString stringWithFormat:@"%f seconds", sender.countDownDuration];
}

I've tried setting a default value, which had no effect.

What's going on?

Solution

  • This seems to be a bug in the iOS 7 implementation of UIDatePicker. I'd suggest filing a radar on it.

    Building on the iOS 6 SDK and running on an iOS 6 device will work, while running on an iOS 7 device will not.

    You can fix it by adding this line of code to your - (void)viewDidLoad method

    [self.datePicker setDate:[NSDate date] animated:YES];