stringWithFormat 的问题 [英] Issues with stringWithFormat

问题描述

请如何让我的 stringWithFormat/initWithFormat 显示 am/pm 而不是 24hrs，即使用户从 pickerviewer 中选择 am/pm?当用户选择时间时；例如 4:15 pm，而不是显示 4:15pm 作为确认，而是显示 16:15.我希望它是下午 4:15.请帮忙！！

Please how do I make my stringWithFormat/initWithFormat to display am/pm instead of 24hrs, even though users selects am/pm from the pickerviewer? When a user select time; eg 4:15 pm, instead of it to display 4:15pm as confirmation, it displays 16:15 instead. I want it as 4:15pm. PLEASE HELP!!

-(IBAction)datePickerValueChanged:(id)sender
{ NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"en_US_POSIX"]];
[dateFormatter setDateFormat:@"h:mm:ss a"];
NSString *strDate = [dateFormatter stringFromDate:self.pick.date];

dateArray = [strDate componentsSeparatedByString:@":"];

NSDate *current = [NSDate date];
NSString *currentTime = [dateFormatter stringFromDate:current];
NSArray *currArray = [currentTime componentsSeparatedByString:@":"];

curr = [currArray[0] intValue]*60 + [currArray[1] intValue];
min = [currArray[0] intValue]*60 + [currArray[1] intValue] + 30;
next = [[dateArray objectAtIndex:0] intValue]*60 +[[dateArray objectAtIndex:1] intValue];

....这是显示值的地方:

             NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
             [dateFormatter setDateFormat:@"yyyy-MM-dd"];
             NSString *strDate = [dateFormatter stringFromDate:[NSDate date]];

             time = [[NSString alloc]initWithFormat:@"%@T%@:%@:00",strDate, [dateArray objectAtIndex:0], [dateArray objectAtIndex:1]];
             NSString *msg = [[NSString alloc] initWithFormat:@"%@ %@ %@ %@ ?", NSLocalizedString(@"do_ticket", nil), self.category.description,NSLocalizedString(@"at", nil),[[NSString alloc]initWithFormat:@"%@:%@", [dateArray objectAtIndex:0], [dateArray objectAtIndex:1]]];
             alert_tick = [[UIAlertView alloc] initWithTitle:nil
                                                     message:msg
                                                    delegate:self
                                           cancelButtonTitle:nil
                                           otherButtonTitles:NSLocalizedString(@"Yes", nil), NSLocalizedString(@"No", nil), nil];
             [alert_tick show];
}

推荐答案

改用 @"hh:mm a" 格式.

示例:

NSDate *today = [NSDate dateWithTimeIntervalSinceNow:0];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"hh:mm a"];
NSDate *formattedDate = [formatter stringFromDate:today];
NSLog(@"date : %@", formattedDate);

输出:

date : 09:58 AM

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