UbiquityStoreManager
Maarten Billemont presents a framework for working around Core Data iCloud bugs (via CocoaPods):
While Apple portrays iCloud integration as trivial, the contrary is certainly true. Especially for Core Data, there are many caveats, side-effects and undocumented behaviors that need to be handled to get a reliable implementation.
Unfortunately, Apple also has a bunch of serious bugs left to work out in this area, which can sometimes lead to cloud stores that become desynced or even irreparably broken.
UbiquityStoreManagerhandles these situations as best as possible.
