Objective C: UIDatePicker UIControlEventValueChanged only fired on second selection
问题 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: Here's the action triggered on Value Changed: from DetailViewController.m - (IBAction