Assigning to 'id<UINavigationControllerDelegate,UIImagePickerControllerDelegate> _Nullable' from incompatible type 'InfchangeVC *const __strong'
出现 Assigning to 'id<UINavigationControllerDelegate,UIImagePickerControllerDelegate>' from incompatible type 'ManageMessageViewController' 警告 当调用UIImagePickerController时,在进行委托定义是提示Assigning to 'id<UINavigationControllerDelegate,UIImagePickerControllerDelegate>' from incompatible type 'ManageMessageViewController',可以在声明类所遵循的协议中加入UINavigationControllerDelegate即可解决