时间 多少分钟前

- (NSString *)compareCurrentTime:(NSString *)str{

    

    //把字符串转为NSdate

    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];

    [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

    NSDate *timeDate = [dateFormatter dateFromString:str];

    

    //得到与当前时间差

    NSTimeInterval  timeInterval = [timeDate timeIntervalSinceNow];

    timeInterval = -timeInterval;

    //标准时间和北京时间差8个小时

    timeInterval = timeInterval - 8*60*60;

    long temp = 0;

    NSString *result;

    if (timeInterval < 60) {

        result = [NSString stringWithFormat:@"刚刚"];

    }

    else if((temp = timeInterval/60) <60){

        result = [NSString stringWithFormat:@"%ld分钟前",temp];

    }

    

    else if((temp = temp/60) <24){

        result = [NSString stringWithFormat:@"%ld小时前",temp];

    }

    

    else if((temp = temp/24) <30){

        result = [NSString stringWithFormat:@"%ld天前",temp];

    }

    

    else if((temp = temp/30) <12){

        result = [NSString stringWithFormat:@"%ld月前",temp];

    }

    else{

        temp = temp/12;

        result = [NSString stringWithFormat:@"%ld年前",temp];

    }

    

    return  result;

}