如何在ios中获取所有UTC缩写的列表

Question

我有一个应用程序，我想在其中提供UTC时区列表，以便用户可以选择目的地时间。我有picker视图中的所有国家缩写。但我想要UTC缩写。有人能告诉我怎样才能做到这一点吗。

感谢

Answer 1

您可以将NSTimeZone的knownTimeZoneNames属性用于所有时区。

[NSTimeZone knownTimeZoneNames]

或者您可以使用缩写Dictionary来获取所有缩写

[[NSTimeZone abbreviationDictionary] allKeys]

如果您想要这些时区的时间，请使用以下代码

NSArray *abbs = [[NSTimeZone abbreviationDictionary] allKeys];
    for (id eachObj in abbs) {
        NSString *dateStr = [self dateFromTimeZoneAbbreviation:eachObj];
        NSLog(@"%@",dateStr);
    }

将方法定义为

-(NSString *)dateFromTimeZoneAbbreviation:(NSString *)abb   {
    NSString *dateStr;
    NSTimeZone *currentTimeZone = [NSTimeZone localTimeZone];
    NSTimeZone* timeZoneFromAbbreviation = [NSTimeZone timeZoneWithAbbreviation:abb];
    NSInteger currentGMTOffset = [currentTimeZone secondsFromGMTForDate:[NSDate date]];
    NSInteger gmtOffset = [timeZoneFromAbbreviation secondsFromGMTForDate:[NSDate date]];
    NSTimeInterval gmtInterval = currentGMTOffset - gmtOffset;
    NSDate *destinationDate = [[NSDate alloc] initWithTimeInterval:gmtInterval sinceDate:[NSDate date]] ;
    NSDateFormatter *dateFormatters = [[NSDateFormatter alloc] init];
    [dateFormatters setDateFormat:@"dd-MMM-yyyy hh:mm"];
    /*[dateFormatters setDateStyle:NSDateFormatterShortStyle];
     [dateFormatters setTimeStyle:NSDateFormatterShortStyle];
     [dateFormatters setDoesRelativeDateFormatting:YES];*/
    [dateFormatters setTimeZone:[NSTimeZone systemTimeZone]];
    dateStr = [dateFormatters stringFromDate: destinationDate];
    NSLog(@"DateString : %@, TimeZone : %@", dateStr , timeZoneFromAbbreviation.abbreviation);
    return dateStr;
}

Answer 2

NSLog(@"%@", [NSTimeZone knownTimeZoneNames]);//viewDidLoad
for(id timezone in [NSTimeZone knownTimeZoneNames]){
     NSLog(@"%@",[self getTimeZoneStringForAbbriviation:timezone]);
    NSLog(@"%@", timezone);
}
-(NSString*)getTimeZoneStringForAbbriviation:(NSString*)abbr{
    NSTimeZone *atimezone=[NSTimeZone timeZoneWithName:abbr];
    int minutes = (atimezone.secondsFromGMT / 60) % 60;
    int hours = atimezone.secondsFromGMT / 3600;
    NSString *aStrOffset=[NSString stringWithFormat:@"%02d:%02d",hours, minutes];
    return [NSString stringWithFormat:@"GMT%@",aStrOffset];
}