ios 检测时间格式是 12 小时还是 24 小时格式
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Detect if time format is in 12hr or 24hr format
提问by JonasG
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.
有什么方法可以检测应用程序的当前设备是否使用 12 小时我们的 24 小时格式，以便我可以根据用户的语言/位置设置使用一个 NSDateFormatter 12 小时和一个 24 小时？就像 UIDatePicker 检测并显示 AM/PM 选择器一样，如果它是 12h 格式。
回答by JonasG
I figured it out, its pretty easy. I just added this code to viewDidLoad:
我想通了，这很容易。我刚刚将此代码添加到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"));
And it perfectly returns YESor NOdepending on the locale.
它完美地返回YES或NO取决于语言环境。
回答by Mostafa Berg
And here is a Swift 3.0 updated version
这是一个 Swift 3.0 更新版本
func using12hClockFormat() -> Bool {
let formatter = DateFormatter()
formatter.locale = Locale.current
formatter.dateStyle = .none
formatter.timeStyle = .short
let dateString = formatter.string(from: Date())
let amRange = dateString.range(of: formatter.amSymbol)
let pmRange = dateString.range(of: formatter.pmSymbol)
return !(pmRange == nil && amRange == nil)
}
回答by beowulf
this is swift solution that worked for me, those two above did not.
这是对我有用的快速解决方案，上面的两个没有。
let dateString : String = DateFormatter.dateFormat(fromTemplate: "j", options: 0, locale: Locale.current)!
if(dateString.contains("a")){
// 12 h format
return true
}else{
// 24 h format
return false
}
回答by Wiingaard
Here is the Swift version:
这是 Swift 版本：
func using12hClockFormat() -> Bool {
let formatter = NSDateFormatter()
formatter.locale = NSLocale.currentLocale()
formatter.dateStyle = NSDateFormatterStyle.NoStyle
formatter.timeStyle = NSDateFormatterStyle.ShortStyle
let dateString = formatter.stringFromDate(NSDate())
let amRange = dateString.rangeOfString(formatter.AMSymbol)
let pmRange = dateString.rangeOfString(formatter.PMSymbol)
return !(pmRange == nil && amRange == nil)
}
回答by Denis Kutlubaev
Objective C category NSDate+Extensions:
目标 C 类别NSDate+Extensions：
@import Foundation;
@interface NSDate (Extensions)
- (NSString *)getTimeString;
@end
#import "NSDate+Extensions.h"
@implementation NSDate (Extensions)
- (NSString *)getTimeString
{
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
if ([self isTwelveHourDateFormat]) {
[formatter setDateFormat:@"hh:mm\ndd MMM"];
}
else {
[formatter setDateFormat:@"HH:mm\ndd MMM"];
}
return [formatter stringFromDate:self];
}
- (BOOL)isTwelveHourDateFormat
{
NSString *dateFormat = [NSDateFormatter dateFormatFromTemplate:@"j" options:0 locale:[NSLocale currentLocale]];
return [dateFormat containsString:@"a"];
}
@end
