每次24小时风格的NSDate小时数？ [英] Hours in NSDate every time in 24-hour style?

问题描述

我有这个日期格式化程序：

I have this date formatter:

 NSDateFormatter *timeFormatter = [[NSDateFormatter alloc] init];
 [timeFormatter setDateFormat:@"HH:mm"];

如果我使用这个：

 NSDate *myDate = [timeFormatter dateFromString:@"13:00"];

它返回：

 "1:00"

这是因为模拟器已关闭24 -小时。但对于我的应用程序，我真的需要13:00而不是1:00

This is because the simulator has switched off 24-hour. But for my app I really need "13:00" instead of "1:00"

--- 编辑1 ---

添加了新代码：

NSCalendar *calendar= [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSCalendarUnit unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit |  NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;

NSDateFormatter *timeFormatter = [[NSDateFormatter alloc] init];
[timeFormatter setDateFormat:@"HH:mm"];
NSDate *timeForFirstRow = [timeFormatter dateFromString:@"13:00"];
NSDateComponents *dateComponents = [calendar components:unitFlags fromDate:timeForFirstRow];
NSInteger hour = [dateComponents hour]; //This will be 1 instead of 13
NSInteger minute = [dateComponents minute];

推荐答案

如果你想强制它12小时或24小时模式，无论用户的24/12小时模式设置如何，您都应将日期格式化程序的区域设置设置为en_US_POSIX（12小时），或者设置为24小时模式的en_GB。

If you want to force it to 12-hour or 24-hour mode, regardless of the user's 24/12 hour mode setting, you should set the locale of the date formatter to en_US_POSIX (for 12-hour), or, say, en_GB for the 24-hour mode.

即

NSLocale* formatterLocale = [[[NSLocale alloc] initWithLocaleIdentifier:@"en_GB"] autorelease];
[timeFormatter setLocale:formatterLocale];

此处还有更多内容：

http://developer.apple.com/iphone/library/qa/qa2010 /qa1480.html

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