'__weak' only applies to Objective-C object or block pointer types; type here is 'int'

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ERROR:

'__weak' only applies to Objective-C object or block pointer types; type here is 'int'
A parameter list without types is only allowed in a function definition
Expected ';' at end of declaration
Insert ';'
Type specifier missing, defaults to 'int'

解决办法如下：

Xcode－> Build Settings-> C Language Dialect修改配置，C99改为GNU99，C99不包含typeof