http - IOS的POST必须使用字典吗

不是,AF的是,系统的是设置

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:baseURL];
    [request setHTTPMethod:@"POST"];
    NSString *postString =@"para1=参数1&para2=参数2...";
    [request setHTTPBody:[postString dataUsingEncoding:NSUTF8StringEncoding]];