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[WEEX-200][iOS] deprecate wxcallback and wxmodulecallback #1000
As iOS developers knows, we cannot distinguish the block by its params count, but it has been a time we use the default value of block parameter, I find out that the default value could be dirty data.
here is the callback type definition.
typedef void (^WXCallback)(_Nonnull id result)
typedef void (^WXKeepAliveCallback)(_Nonnull id result, BOOL keepAlive);
when the method called, weexSDK will set the callback according to the @encode result,
but these two type's encode result are all "?", see more encode result from Apple Documents https://developer.apple.com/library/content/documentation/Cocoa/Conceptual/ObjCRuntimeGuide/Articles/ocrtTypeEncodings.html