NSDate、NSTimeInterval 计算时间差

#计算接口数据返回耗时：

    NSDate *d1 = [NSDate date];
    [self.manager requestJSONDataWithMethod:@"post" path:@"data/search/xxx.do" parameters:params success:^(id responseObject) {
        NSDate *d2 = [NSDate date];
        NSTimeInterval time = [d2 timeIntervalSinceDate:d1];
        NSLog(@"liqi==searchTimeCost====%f",time);
        //简单计算耗时
        successBlock([self parseResponDatas:responseObject]);
    } failure:^(NSError *error) {
        failureBlock(error);
    }

• 注：NSTimeInterval本身是以秒为单位的值。

#计算任意两个时间点的时间差：

- (NSTimeInterval)pleaseInsertStarTime:(NSString *)starTime andInsertEndTime:(NSString *)endTime{
    NSDateFormatter* formater = [[NSDateFormatter alloc] init];
    [formater setDateFormat:@"mm:ss"];//根据自己的需求定义格式
    NSDate* startDate = [formater dateFromString:starTime];
    NSDate* endDate = [formater dateFromString:endTime];
    NSTimeInterval time = [endDate timeIntervalSinceDate:startDate];
    return time;
}

作者：Silence_广
链接：https://www.jianshu.com/p/8ebc8f55e2aa
來源：简书