CocoaAsyncSocket provides easy-to-use and powerful asynchronous socket libraries for Mac and iOS. The classes are described below.

TCP

GCDAsyncSocket and AsyncSocket are TCP/IP socket networking libraries. Here are the key features available in both:

Native objective-c, fully self-contained in one class.
No need to muck around with sockets or streams. This class handles everything for you.
Full delegate support
Errors, connections, read completions, write completions, progress, and disconnections all result in a call to your delegate method.
Queued non-blocking reads and writes, with optional timeouts.
You tell it what to read or write, and it handles everything for you. Queueing, buffering, and searching for termination sequences within the stream - all handled for you automatically.
Automatic socket acceptance.
Spin up a server socket, tell it to accept connections, and it will call you with new instances of itself for each connection.
Support for TCP streams over IPv4 and IPv6.
Automatically connect to IPv4 or IPv6 hosts. Automatically accept incoming connections over both IPv4 and IPv6 with a single instance of this class. No more worrying about multiple sockets.
Support for TLS / SSL
Secure your socket with ease using just a single method call. Available for both client and server sockets.

GCDAsyncSocket is built atop Grand Central Dispatch:

Fully GCD based and Thread-Safe
It runs entirely within its own GCD dispatch_queue, and is completely thread-safe. Further, the delegate methods are all invoked asynchronously onto a dispatch_queue of your choosing. This means parallel operation of your socket code, and your delegate/processing code.
The Latest Technology & Performance Optimizations
Internally the library takes advantage of technologies such as kqueue's to limit system calls and optimize buffer allocations. In other words, peak performance.

AsyncSocket wraps CFSocket and CFStream:

Fully Run-loop based
Use it on the main thread or a worker thread. It plugs into the NSRunLoop with configurable modes.

UDP

GCDAsyncUdpSocket and AsyncUdpSocket are UDP/IP socket networking libraries. Here are the key features available in both:

Native objective-c, fully self-contained in one class.
No need to muck around with low-level sockets. This class handles everything for you.
Full delegate support.
Errors, send completions, receive completions, and disconnections all result in a call to your delegate method.
Queued non-blocking send and receive operations, with optional timeouts.
You tell it what to send or receive, and it handles everything for you. Queueing, buffering, waiting and checking errno - all handled for you automatically.
Support for IPv4 and IPv6.
Automatically send/recv using IPv4 and/or IPv6. No more worrying about multiple sockets.

GCDAsyncUdpSocket is built atop Grand Central Dispatch:

Fully GCD based and Thread-Safe
It runs entirely within its own GCD dispatch_queue, and is completely thread-safe. Further, the delegate methods are all invoked asynchronously onto a dispatch_queue of your choosing. This means parallel operation of your socket code, and your delegate/processing code.

AsyncUdpSocket wraps CFSocket:

Fully Run-loop based
Use it on the main thread or a worker thread. It plugs into the NSRunLoop with configurable modes.

Can't find the answer to your question in any of the wiki articles? Try the mailing list.

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