Date Picker - show time between two dates (UIDatePickerModeDateAndTime) - ios

Question

I'm currently showing a Date Picker of the kind UIDatePickerModeCountDownTimer that uses:
- (UIDatePicker *)datePicker {
if (!_datePicker) {
_datePicker = [[UIDatePicker alloc] init];
_datePicker.datePickerMode = UIDatePickerModeCountDownTimer;
_datePicker.backgroundColor = [UIColor colorWithWhite:1.0 alpha:0.8];
}
return _datePicker;
}
- (void)setDuration:(NSTimeInterval)duration {
_duration = duration;
self.datePicker.countDownDuration = _duration;
}
... date picker, and shows (in a label) the time from current date to date chosen in future with:
- (void)update {
if (self.time) {
[self setImage:nil forState:UIControlStateNormal];
NSString *title;
NSTimeInterval timeInterval = [self.time doubleValue];
if (self.ticking) {
NSMutableString *dateFormat = [[NSMutableString alloc] init];
if (timeInterval < 0) {
[dateFormat appendString:#"-"];
}
if (fabsf(timeInterval) > 60 * 60) {
[dateFormat appendString:#"hh:"];
}
[dateFormat appendString:#"mm:ss"];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
formatter.dateFormat = dateFormat;
formatter.timeZone = [NSTimeZone timeZoneForSecondsFromGMT:0];
NSDate *date = [NSDate dateWithTimeIntervalSince1970:timeInterval];
title = [formatter stringFromDate:date];
if ([self.time integerValue] > 0) {
self.circleView.backgroundColor = [UIColor colorWithRed:0.373 green:0.702 blue:0.522 alpha:1];
} else {
self.circleView.backgroundColor = [UIColor colorWithRed:0.820 green:0.373 blue:0.424 alpha:1];
}
} else {
NSMutableString *text = [[NSMutableString alloc] init];
if (fabsf(timeInterval) < 60) {
// Show seconds
[text appendFormat:#"%.0fs", timeInterval];
} else if (fabsf(timeInterval) < 60 * 60) {
// Show minutes
[text appendFormat:#"%.0fm", floorf(timeInterval / 60)];
} else {
// Show hours
[text appendFormat:#"%.0fh", floorf(timeInterval / 60 / 60)];
}
title = text;
self.circleView.backgroundColor = [UIColor colorWithWhite:1.0f alpha:0.2];
}
[self setTitle:title forState:UIControlStateNormal];
return;
}
[self setTitle:nil forState:UIControlStateNormal];
[self setImage:[UIImage imageNamed:#"plus"] forState:UIControlStateNormal];
self.circleView.backgroundColor = [UIColor colorWithWhite:1.0f alpha:0.05];
}
... but I switched the DatePicker to UIDatePickerModeDateAndTime and need to figure out how to update my update method with it.
I need to show month/day in addition to hour/minute/second in the label.

Answer 1

If you want a method like delegate, then this can help you..
Add target to your date picker....
[myDatePicker addTarget:self action:#selector(onPickerValueChanged:) forControlEvents:UIControlEventValueChanged];
Remove target in dealloc. Otherwise if your picker is scrolling and viewController is popped, app will crash.
- (void dealloc
{
[myPicker removeTarget:self action:#selector(onPickerValueChanged:) forControlEvents:UIControlEventValueChanged];
[myPicker release];//FOR NON ARC
[super dealloc];//FOR NON ARC
}
Implement value Change like
- (IBAction)onPickerValueChanged:(id)sender
{
[self update];
}