Observing change in UIDatePicker
I noticed that there is no delegate to observe changes in UIDatePicker. Is there a way to detect when a change is made in the picker without confirming anything, like the moment it spins and lands on a new number I want to be able to detect that. I thought about key value observing, but I don't think there's a property that changes on the spot
You need to add to your UIDatePicker the UIControlEventValueChanged
event to handle date changes:
[myDatePicker addTarget:self action:@selector(dateIsChanged:) forControlEvents:UIControlEventValueChanged];
Then the implementation:
- (void)dateIsChanged:(id)sender{
NSLog(@"Date changed");
}
Go to IB and drag from the UIDatePicker
to your .h file. Then select
Handle this however you want in your .m file; XCode will add the method below for you.
Swift 4.2 | Xcode 10.1
@objc func handleDatePicker(_ datePicker: UIDatePicker) {
textField.text = datePicker.date.formatted
}
override func viewDidLoad() {
super.viewDidLoad()
datePicker.addTarget(self, action: #selector(handleDatePicker), for: .valueChanged)
}
extension Date {
static let formatter: DateFormatter = {
let formatter = DateFormatter()
formatter.dateFormat = "EEEE, dd MMM yyyy HH:mm:ss Z"
return formatter
}()
var formatted: String {
return Date.formatter.string(from: self)
}
}