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1. How to implement ftp upload using native objective-c without using third-party libraries?
2. This is an official solution: https://developer.apple.com/library/ios/documentation/Networking/Conceptual/CFNetwork/CFFTPTasks/CFFTPTasks.html#//apple_ref/doc/uid/TP30001132-CH9-SW2

typedef struct MyStreamInfo {
 
    CFWriteStreamRef  writeStream;
    CFReadStreamRef   readStream;
    CFDictionaryRef   proxyDict;
    SInt64            fileSize;
    UInt32            totalBytesWritten;
    UInt32            leftOverByteCount;
    UInt8             buffer[kMyBufferSize];
 
} MyStreamInfo;

3. Who can give me some advice?