Question

我有一个显示小时的按钮 - 当视图加载它时设置为当前时间。然后，当我加载日期选择器子视图时，它总是设置为提前2小时。类似的东西：日期按钮：10：31日期选择器：12：31 将日期选择器中的小时更改为：13：31后，日期按钮变为：11：31。

代码：

-(IBAction) timeClicked
{
    [[NSBundle mainBundle] loadNibNamed:@"timePicker" owner:self options:nil];
    //timeView = [[UIView alloc]initWithNibName:@"timePicker" bundle:nil];
    [timeView setFrame:CGRectMake(0, 480, 320, 431)];
    NSLog(@"time clicked date: %@", select);
    NSDate* sourceDate = [NSDate date];

    NSTimeZone* sourceTimeZone = [NSTimeZone timeZoneWithName:@"Jerusalem"];
    NSTimeZone* destinationTimeZone = [NSTimeZone systemTimeZone];

    NSInteger sourceGMTOffset = [sourceTimeZone secondsFromGMTForDate:sourceDate];
    NSInteger destinationGMTOffset = [destinationTimeZone secondsFromGMTForDate:sourceDate];
    NSTimeInterval interval = destinationGMTOffset - sourceGMTOffset;

    NSDate* destinationDate = [[[NSDate alloc] initWithTimeInterval:interval sinceDate:sourceDate] autorelease];


    //[timePick setTime:destinationDate animated:YES];
    timePick.date=destinationDate;
    NSLog(@"befoer delegate");
    //[timeView setDelegate:self];
    [self.view addSubview:timeView];
    CGRect frame = timeView.frame;
    frame.origin.y = 110;
    [UIView beginAnimations:nil context:NULL];
    timeView.frame = frame;
    [UIView commitAnimations];
    NSLog(@"after");

}


-(IBAction) done
{
    select = [timePick date];
    [UIView beginAnimations:@"RemoveDatePicker" context:NULL];
    [UIView setAnimationDidStopSelector:@selector(transitionDidStop:finished:context:)];
    CGRect rect = timeView.frame;
    rect.origin.y = 460; 
    timeView.frame = rect; 
    [UIView commitAnimations];

}

- (void)transitionDidStop:(NSString *)animationID finished:(BOOL)finished context:(void *)context
{
    if ([animationID isEqualToString:@"RemoveDatePicker"]){
        [timeView removeFromSuperview];
        NSLog(@"RemoveDatePicker");
    }

}


-(IBAction) timeChanged
{
    select =[timePick date];

    [timeButton setTitle:[Path stringFromTime:select] forState:UIControlStateNormal];


    //[timeButton setTitle:@"time" forState:UIControlStateNormal];
}

+(NSString *) stringFromTime: (NSDate *) date
{

    NSString * stringDate = [date description];
    stringDate = [[stringDate substringFromIndex:11] substringToIndex:5];
    NSLog(@"[Path]stringTime: %@", stringDate);
    return stringDate;

}

从视图中加载：

NSDate* sourceDate = [NSDate date];

    NSTimeZone* sourceTimeZone = [NSTimeZone timeZoneWithName:@"Jerusalem"];
    NSTimeZone* destinationTimeZone = [NSTimeZone systemTimeZone];

    NSInteger sourceGMTOffset = [sourceTimeZone secondsFromGMTForDate:sourceDate];
    NSInteger destinationGMTOffset = [destinationTimeZone secondsFromGMTForDate:sourceDate];
    NSTimeInterval interval = destinationGMTOffset - sourceGMTOffset;

    NSDate* destinationDate = [[[NSDate alloc] initWithTimeInterval:interval sinceDate:sourceDate] autorelease];

    timeModeChange.selectedSegmentIndex=1;
    select=[[NSDate alloc]initWithDate:destinationDate ];
        NSLog(@"date %@", select);
    [timeButton setTitle:[Path stringFromTime:select] forState:UIControlStateNormal];

Answer 1

虽然我没有为iPhone或Objective-C开发，所以我不是100％的语法等等，但在我看来，你在某一点上将你的输入时间转换为GMT（或者UTC）而在另一方面你不是。这可能是因为您所选择的时区（以色列/耶路撒冷的时区）为UTC + 2（+3 IST），因此可能导致2小时的差异。我会尽量不“移动”时间，看看是否有帮助。如果它确实那么你至少发现了问题，我会说。

Answer 2

解决。问题出在stringFromTime - [date discription]返回错误的值。

仅限时间的UIDatePicker比当前时间提前2小时显示

2 个答案: