iOS:如果区域设置合适,以24小时格式显示时间？

Question

我的iOS应用程序将显示当前时间.如何确定用户的区域设置是否更喜欢12小时或24小时格式化？

Answer 1

请参阅 NSDateFormatter 类http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSDateFormatter_Class/Reference/Reference.html

就像是：

NSDate *date = [NSDate date];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];

[dateFormatter setDateStyle:NSDateFormatterNoStyle];
[dateFormatter setTimeStyle:NSDateFormatterMediumStyle];
[dateFormatter setLocale:[NSLocale currentLocale]];

NSString *dateString = [dateFormatter stringFromDate:date];