iOS 刚刚，几分钟前，几小时前，几天前，几月前，几年前

- (NSString *)compareCurrentTime:(NSDate*) compareDate
{
    NSTimeInterval  timeInterval = [compareDate timeIntervalSinceNow];
    timeInterval = -timeInterval;
    int temp = 0;
    NSString *result;
    if (timeInterval < 60) {
        result = @"刚刚";
    }
    else if((temp = timeInterval/60) <60){
        result = [NSString stringWithFormat:@"%d分钟前",temp];
    }
    else if((temp = temp/60) <24){
        result = [NSString stringWithFormat:@"%d小时前",temp];
    }
    else if((temp = temp/24) <30){
        result = [NSString stringWithFormat:@"%d天前",temp];
    }
    else if((temp = temp/30) <12){
        result = [NSString stringWithFormat:@"%d月前",temp];
    }
    else{
        temp = temp/12;
        result = [NSString stringWithFormat:@"%d年前",temp];
    }
    return  result;
}

另类写法

//-------------------------------------------------------------------------------------------------------------------------------------------------
NSString* TimeElapsed(NSTimeInterval seconds)
//-------------------------------------------------------------------------------------------------------------------------------------------------
{
    NSString *elapsed;
    if (seconds < 60)
    {
        elapsed = @"Just now";
    }
    else if (seconds < 60 * 60)
    {
        int minutes = (int) (seconds / 60);
        elapsed = [NSString stringWithFormat:@"%d %@", minutes, (minutes > 1) ? @"mins" : @"min"];
    }
    else if (seconds < 24 * 60 * 60)
    {
        int hours = (int) (seconds / (60 * 60));
        elapsed = [NSString stringWithFormat:@"%d %@", hours, (hours > 1) ? @"hours" : @"hour"];
    }
    else
    {
        int days = (int) (seconds / (24 * 60 * 60));
        elapsed = [NSString stringWithFormat:@"%d %@", days, (days > 1) ? @"days" : @"day"];
    }
    return elapsed;
}