Breaking changes some control methods

[Code-Hex]

Why

• Not simple.
• Some control methods have a callback parameter and invoke it on Objective-C's thread, not on the goroutine. If you call runtime.Goexit function on the callback, Go will throw "internal lockOSThread error" because the function terminates the goroutine that calls it, however, there is no goroutine in Objective-C's thread. Some Fatal function calls the runtime.Goexit function within it. It would be very difficult for users to understand this rule.

Note

I recommend using StateChangedNotify instead of calling callback.