UIDatePicker in tableview can't be changed sometimes - ios

Question

sometimes I have problems with the UIDatePicker. I built a screen with a UITableView where I can set a start time and an end time for each day of the week.
Now, however, I have the strange behavior that the picker sometimes does not allow a change. It is grayed out but not disabled. When I turn the picker it moves, but when I let go, it automatically returns to its previous value.
The behavior is reproducible. I change one day and close the picker. Change another day and close the picker. Then I scroll down a bit, the tableview jerking slightly. If I now open the last changed picker I have the mentioned behavior. I noticed the behavior on iOS 9 to 11 and on different devices.
For a better understanding, I have created a screenshot.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"timeProfilSettingsCell";
TimeProfilSettingsCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
NSDate *dateValidFrom = nil;
NSDate *dateValidUntil = nil;
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"HH:mm"];
[dateFormatter setTimeZone:[NSTimeZone timeZoneWithName:#"UTC"]];
if (cell == nil)
{
[tableView registerNib:[UINib nibWithNibName:#"TimeProfilSettingsCell" bundle:nil] forCellReuseIdentifier:CellIdentifier];
cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
}
TimeInterval *timeInterval = [nma_currentTimeInterval objectAtIndex:indexPath.row];
if (timeInterval.ni_validFrom == TIMEPROFIL_VALUE_ALWAYS_VALID_FROM && timeInterval.ni_validUntil == TIMEPROFIL_VALUE_ALWAYS_VALID_UNTIL && timeInterval.ni_timeIntervalWeekdayActive == 1)
{
[cell.checkBoxImageView setImage:[UIImage imageNamed:#"IconHakenBlau"]];
}
else if (timeInterval.ni_timeIntervalWeekdayActive == 1)
{
[cell.checkBoxImageView setImage:[UIImage imageNamed:#"Clock_blue"]];
}
else
{
[cell.checkBoxImageView setImage:[UIImage imageNamed:#"IconOvalBlau"]];
}
cell.separatorView.backgroundColor = [UIColor colorWithRed:227.0/255.0 green:227.0/255.0 blue:227.0/255.0 alpha:1.0];
cell.weekDayLabel.text = [self getWeekDayName:indexPath.row];
[cell.checkBoxButton addTarget:self action:#selector(checkBoxButtonAction:) forControlEvents:UIControlEventTouchUpInside];
[cell.checkBoxButton setTag:indexPath.row];
cell.validityLabel.textColor = [UIColor colorWithRed:123.0/255.0 green:164.0/255.0 blue:219.0/255.0 alpha:1.0];
[cell.validityButton addTarget:self action:#selector(validityButtonAction:) forControlEvents:UIControlEventTouchUpInside];
[cell.validityButton setTag:indexPath.row];
// Handling so that the picker is closed when it is clicked elsewhere
UITapGestureRecognizer *tapGestureRecognize = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(dismissDatePicker:)];
tapGestureRecognize.numberOfTapsRequired = 1;
[self.view addGestureRecognizer:tapGestureRecognize];
BOOL b_open = NO;
if (b_pickerVisible && ni_touchedRow == indexPath.row)
{
b_open = YES;
cell.b_validityPickerVisible = YES;
[cell.validityStartPicker setHidden:NO];
[cell.validityStartPicker setEnabled:YES];
[cell.validityEndPicker setHidden:NO];
[cell.validityEndPicker setEnabled:YES];
cell.validityFromLabel.hidden = NO;
[cell.separatorView setFrame:CGRectMake(cell.separatorView.frame.origin.x, 304, cell.separatorView.frame.size.width, cell.separatorView.frame.size.height)];
[cell.validityStartPicker setTimeZone:[NSTimeZone timeZoneWithName:#"UTC"]];
[cell.validityEndPicker setTimeZone:[NSTimeZone timeZoneWithName:#"UTC"]];
[cell.validityStartPicker addTarget:self action:#selector(updateValidityStartPicker:) forControlEvents:UIControlEventValueChanged];
[cell.validityEndPicker addTarget:self action:#selector(updateValidityEndPicker:) forControlEvents:UIControlEventValueChanged];
if (b_pickerJustOpened)
{
b_pickerJustOpened = NO;
if (tableView.contentOffset.y > 0)
{
tableView.contentOffset = CGPointMake(0, tableView.contentOffset.y + 102);
}
}
if (b_pickerValueChanged)
{
// Picker-value not changed
}
else if (timeInterval.ni_validFrom == TIMEPROFIL_VALUE_INVALID && timeInterval.ni_validUntil == TIMEPROFIL_VALUE_INVALID)
{
// Default value, if the entry was previously "not"
[cell.validityStartPicker setDate:[NSDate dateWithTimeIntervalSince1970:0x20 /* 8:00 */ * 900 /* 15 Minuten x 60 Sekunden */] animated:NO];
[cell.validityEndPicker setDate:[NSDate dateWithTimeIntervalSince1970:0x40 /* 16:00 */ * 900 /* 15 Minuten x 60 Sekunden */] animated:NO];
b_pickerValueChanged = YES;
[cell.validityLabel setTextColor:[UIColor redColor]];
}
else
{
[cell.validityStartPicker setDate:[NSDate dateWithTimeIntervalSince1970:timeInterval.ni_validFrom * 900 /* 15 Minuten x 60 Sekunden */] animated:NO];
[cell.validityEndPicker setDate:[NSDate dateWithTimeIntervalSince1970:(timeInterval.ni_validUntil + 1 /* +1 aufrunden auf die volle viertel Stunde*/) * 900 /* 15 Minuten x 60 Sekunden */] animated:NO];
}
}
else
{
cell.b_validityPickerVisible = NO;
cell.validityStartPicker.hidden = YES;
cell.validityEndPicker.hidden = YES;
cell.validityFromLabel.hidden = YES;
[cell.validityStartPicker setEnabled:YES];
[cell.validityEndPicker setEnabled:YES];
[cell.separatorView setFrame:CGRectMake(cell.separatorView.frame.origin.x, 88, cell.separatorView.frame.size.width, cell.separatorView.frame.size.height)];
}
if (b_pickerValueChanged && ni_touchedRow == indexPath.row)
{
if ([[dateFormatter stringFromDate:[cell.validityEndPicker date]] isEqualToString:#"00:00"])
{
cell.validityLabel.text = [NSString stringWithFormat:#"%# - 23:59:59 %# >", [dateFormatter stringFromDate:[cell.validityStartPicker date]], NSLocalizedString(#"oClock", nil)];
}
else
{
cell.validityLabel.text = [NSString stringWithFormat:#"%# - %# %# >", [dateFormatter stringFromDate:[cell.validityStartPicker date]], [dateFormatter stringFromDate:[cell.validityEndPicker date]], NSLocalizedString(#"oClock", nil)];
}
[cell.validityLabel setTextColor:[UIColor redColor]];
}
else if ((timeInterval.ni_validFrom == TIMEPROFIL_VALUE_ALWAYS_VALID_FROM && timeInterval.ni_validUntil == TIMEPROFIL_VALUE_ALWAYS_VALID_UNTIL && timeInterval.ni_timeIntervalWeekdayActive == 1) || (ni_flagTimeIntervalActive == 0 && timeInterval.ni_timeIntervalWeekdayActive == 1))
{
cell.validityLabel.text = NSLocalizedString(#"Always", nil);
}
else if (timeInterval.ni_validFrom == TIMEPROFIL_VALUE_INVALID || timeInterval.ni_validUntil == TIMEPROFIL_VALUE_INVALID)
{
cell.validityLabel.text = NSLocalizedString(#"Not", nil);
}
else
{
timeInterval.ni_timeIntervalWeekdayActive = 1;
dateValidFrom = [NSDate dateWithTimeIntervalSince1970:timeInterval.ni_validFrom * 900 /* 15 Minuten x 60 Sekunden */];
dateValidUntil = [NSDate dateWithTimeIntervalSince1970:(timeInterval.ni_validUntil + 1 /* +1 aufrunden auf die volle viertel Stunde*/) * 900 /* 15 Minuten x 60 Sekunden */];
if (timeInterval.ni_validUntil == TIMEPROFIL_VALUE_ALWAYS_VALID_UNTIL)
{
cell.validityLabel.text = [NSString stringWithFormat:#"%# - 23:59:59 %#", [dateFormatter stringFromDate:dateValidFrom], NSLocalizedString(#"oClock", nil)];
}
else
{
cell.validityLabel.text = [NSString stringWithFormat:#"%# - %# %#", [dateFormatter stringFromDate:dateValidFrom], [dateFormatter stringFromDate:dateValidUntil], NSLocalizedString(#"oClock", nil)];
}
}
[cell setSelectionStyle:UITableViewCellSelectionStyleNone];
return cell;
}
I have extracted the part of the code into a project and made it available for download.
I hope someone has an idea.
Thanks for your help

Answer 1

Finally I found a solution for the problem. After setting the locale in the code the picker didn't block.
Here ist the code I added after setTimeZone: in my code.
[cell.validityStartPicker setLocale:[[NSLocale alloc] initWithLocaleIdentifier:[[NSLocale currentLocale] localeIdentifier]]];
[cell.validityEndPicker setLocale:[[NSLocale alloc] initWithLocaleIdentifier:[[NSLocale currentLocale] localeIdentifier]]];