使用Objective-C开发CoreData遇到Swift Error

当在Objective-C项目中中使用CoreData时，由于部分数据字段默认是支持Swift的，现在要把Swift修改成Objective-C.

The “Swift Language Version” (SWIFT_VERSION) build setting must be set to a supported value for targets which use Swift. This setting can be set in the build settings editor.