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?
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You can do it with a native socket. I remember back then I used PHP’s Socket to implement the FTP client natively. Not difficult