检测时间格式是12小时还是24小时格式 [英] Detect if time format is in 12hr or 24hr format

问题描述

有什么方法来检测应用程序的当前设备是否使用12h我们的24h格式，所以我可以使用一个NSDateFormatter为12h和一个24h取决于用户的语言/爱好设置？就像UIDatePicker检测和显示AM / PM选择器如果是12h格式。

Is there any way to detect if the current device of the app uses 12h our 24h format, so that I can use one NSDateFormatter for 12h and one for 24h depending on the users language/loaction setting? Just Like the UIDatePicker detects and shows the AM/PM picker if it is 12h format.

推荐答案

简单。我只是添加这个代码到 viewDidLoad ：

I figured it out, its pretty easy. I just added this code to viewDidLoad :

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setLocale:[NSLocale currentLocale]];
[formatter setDateStyle:NSDateFormatterNoStyle];
[formatter setTimeStyle:NSDateFormatterShortStyle];
NSString *dateString = [formatter stringFromDate:[NSDate date]];
NSRange amRange = [dateString rangeOfString:[formatter AMSymbol]];
NSRange pmRange = [dateString rangeOfString:[formatter PMSymbol]];
BOOL is24h = (amRange.location == NSNotFound && pmRange.location == NSNotFound);
[formatter release];
NSLog(@"%@\n",(is24h ? @"YES" : @"NO"));

并完全返回 YES 或 NO ，具体取决于区域设置。

And it perfectly returns YES or NO depending on the locale.

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