NSManageObjectContext – Class is not key value coding-compliant for the key @count

最近把ios的代码升级到了ios10和xcode8 ，出现了大量：

NSManageObjectContext - Class is not key value coding-compliant for the key @count

解决：
参考：http://stackoverflow.com/questions/39511997/nsmanageobjectcontext-class-is-not-key-value-coding-compliant-for-the-key-cou

更新RestKit:
pod 'RestKit', :git => 'https://github.com/RestKit/RestKit.git', :commit => '9cbba9eb1b490c3c5e2873c8fba8e9c0fec1bf07'

更新后会有新的错误，依照提示修复就可以了。