Question

我可以使用NSDateComponentsFormatter来获取“一小时前”或“一天前”之类的字符串吗？我的意思是，我认为应该很容易得到“1小时前”或“1天前”，但不知道。

Answer 1

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setTimeStyle:NSDateFormatterNoStyle];
[dateFormatter setDateStyle:NSDateFormatterMediumStyle];

NSLocale *locale = [NSLocale currentLocale];
[dateFormatter setLocale:locale];

[dateFormatter setDoesRelativeDateFormatting:YES];

Answer 2

您可以使用此功能

- (NSString *)timeAgo
{
    NSDate *now = [NSDate date];
    double deltaSeconds = fabs([self timeIntervalSinceDate:now]);
    double deltaMinutes = deltaSeconds / 60.0f;

    int minutes;

    if(deltaSeconds < 5)
    {
        return NSDateTimeAgoLocalizedStrings(@"Just now");
    }
    else if(deltaSeconds < 60)
    {
        return [self stringFromFormat:@"%%d %@seconds ago" withValue:deltaSeconds];
    }
    else if(deltaSeconds < 120)
    {
        return NSDateTimeAgoLocalizedStrings(@"A minute ago");
    }
    else if (deltaMinutes < 60)
    {
        return [self stringFromFormat:@"%%d %@minutes ago" withValue:deltaMinutes];
    }
    else if (deltaMinutes < 120)
    {
        return NSDateTimeAgoLocalizedStrings(@"An hour ago");
    }
    else if (deltaMinutes < (24 * 60))
    {
        minutes = (int)floor(deltaMinutes/60);
        return [self stringFromFormat:@"%%d %@hours ago" withValue:minutes];
    }
    else if (deltaMinutes < (24 * 60 * 2))
    {
        return NSDateTimeAgoLocalizedStrings(@"Yesterday");
    }
    else if (deltaMinutes < (24 * 60 * 7))
    {
        minutes = (int)floor(deltaMinutes/(60 * 24));
        return [self stringFromFormat:@"%%d %@days ago" withValue:minutes];
    }
    else if (deltaMinutes < (24 * 60 * 14))
    {
        return NSDateTimeAgoLocalizedStrings(@"Last week");
    }
    else if (deltaMinutes < (24 * 60 * 31))
    {
        minutes = (int)floor(deltaMinutes/(60 * 24 * 7));
        return [self stringFromFormat:@"%%d %@weeks ago" withValue:minutes];
    }
    else if (deltaMinutes < (24 * 60 * 61))
    {
        return NSDateTimeAgoLocalizedStrings(@"Last month");
    }
    else if (deltaMinutes < (24 * 60 * 365.25))
    {
       minutes = (int)floor(deltaMinutes/(60 * 24 * 30));
        return [self stringFromFormat:@"%%d %@months ago" withValue:minutes];
    }
    else if (deltaMinutes < (24 * 60 * 731))
    {
        return NSDateTimeAgoLocalizedStrings(@"Last year");
    }

    minutes = (int)floor(deltaMinutes/(60 * 24 * 365));
    return [self stringFromFormat:@"%%d %@years ago" withValue:minutes];
}

Answer 3

非常难过，但是在Foundation框架的格式化程序中没有这样的功能。购买即可使用FormattersKit。该套件包含TTTTimeIntervalFormatter，可让您执行以下操作：

TTTTimeIntervalFormatter *timeIntervalFormatter = [[TTTTimeIntervalFormatter alloc] init];
[timeIntervalFormatter stringForTimeInterval:0]; // "just now"
[timeIntervalFormatter stringForTimeInterval:-100]; // "1 minute ago"

获得“一小时前”或“一天前”的NSDateComponentsFormatter

3 个答案: