检测iPhone是否在12小时或24小时模式下显示时间？ [英] Detect whether iPhone is displaying time in 12-Hour or 24-Hour Mode?

问题描述

如何检测iPhone是否在12小时或24小时模式下显示时间？

How can you detect whether iPhone is displaying time in 12-Hour or 24-Hour Mode?

我目前正在监控当前区域的变化，但这不是仅限影响时间显示的设置。日期和时间的24小时切换时间设置会覆盖当前区域设置。

I currently monitor the current region for changes, however that's not the only setting that affects how times are displayed. The 24-hour toggle in the date & time settings overrides the current regions settings.

有没有办法检测此12/14小时设置？

Is there any way to detect this 12/14 hour setting?

推荐答案

我已经找到了一个很好的方法来确定这一点，我已经添加了一个 NSLocale 的类别。它似乎相当准确，并且在测试多个地区时没有发现任何问题。

I've figured out a decent way of determining this with a little function I've added to a category of NSLocale. It appears to be pretty accurate and haven't found any problems with it while testing with several regions.

@implementation NSLocale (Misc)
- (BOOL)timeIs24HourFormat {
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    [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 is24Hour = amRange.location == NSNotFound && pmRange.location == NSNotFound;
    [formatter release];
    return is24Hour;
}
@end

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