Creating
Creating a custom input source involves defining the following:
- The information you want your input source to process.
- A scheduler routine to let interested clients know how to contact your input source.
Signaling the Input Source
- After it hands off its data to the input source, a client must signal the source and wake up its run loop.
- Signaling the source lets the run loop know that the source is ready to be processed
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you should always wake up the run loop explicitly
tips
when the allotted time expires,the run loop call CFRunLoopSourceInvalidate to invalidate all the source0(at the same time invoke cancellation routine to inform the client)
CFRunLoopSourceInvalidate removes source from all the run loop modes in which it was registered.