tableview中的UIDatePicker有时无法更改

时间：2018-03-19 12:54:02

标签： ios uitableview uidatepicker

有时我的UIDatePicker有问题。我用UITableView构建了一个屏幕，我可以设置一周中每一天的开始时间和结束时间 然而，现在，我有一个奇怪的行为，选择器有时不允许更改。它显示为灰色但未禁用。当我转动拾取器时，它会移动，但是当我放开时，它会自动返回到之前的值 行为是可重复的。我改变了一天并关闭了选择器。改变另一天并关闭选择器。然后我向下滚动一下，桌面视图略微抽搐。如果我现在打开最后一个更改的选择器我有上述行为。我注意到iOS 9到11以及不同设备上的行为 为了更好地理解，我创建了一个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;
}

我已将部分代码提取到项目中，并使其可用于download。  

我希望有人有个主意。  

谢谢你的帮助

1 个答案:

答案 0 :(得分：0)

最后，我找到了解决问题的方法。在代码中设置区域设置后，选择器没有阻止。

以下是我在代码中setTimeZone:之后添加的代码。

[cell.validityStartPicker setLocale:[[NSLocale alloc] initWithLocaleIdentifier:[[NSLocale currentLocale] localeIdentifier]]];
[cell.validityEndPicker setLocale:[[NSLocale alloc] initWithLocaleIdentifier:[[NSLocale currentLocale] localeIdentifier]]];
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