xcode 7如何抑制警告“覆盖成员函数但未标记为'override'”

I updated xcode to 7 today. After the update the project I am working on has the warning "overrides a member function but is not marked 'override'". Since our project set "treade warning as error" to true. I got lots of errors.I updated xcode to 7 today. After the update th