xcode SDAutolayout 报错

__weak typeof(self)wSelf = self报错：- A parameter list without types is only allowed in a function definition. A corresponding warning tells me that __weak only applies to Objective-C object or block pointer types;type here is 'int'

解决办法：Xcode－> Build Settings-> C Language Dialect修改配置，C99改为GNU99，C99是不包含typeof的