iCloud不支持有序集..替代解决方案？

iCloud doesn't support ordered sets for relationships, only sets. Right now, i've made an attribute called 'entryIndex', where it stores it's own index value that it's given. When the user deletes the object at a specific index, I want to identify the object and change the value of the objects with higher indexes. How do I do this?iCloud doesn't support ordered sets for relatio