CloudKit 和键值存储的区别

Question

What is the difference between iCloud's "Key-value storage" and CloudKit?

An example scenario would be: if one were to sync a sizable array containing dictionaries, arrays, and other objects. Would the developer want to use CloudKit or Key-value storage?

Answer 1

CloudKit is for syncing real data records as well as assets (files).

iCloud's key-value storage is essential NSUserDefaults but synced across devices.

So think of it that way. If it's a simple value you might store in NSUserDefaults , use key-value storage. If it's actual data you might store in a plist, database, file, or core-data, use CloudKit.

Answer 2

I just thought it might be helpful to mention that according to the iCloud Design Guide :

Apps may store only 1 MB of data in their key-value storage

So that may be something that one would want to take into account in deciding between CloudKit and iCloud Key-Value Storage.

In my case, for the app I'm currently working on this limitation is totally fine. However, I would imagine that in a larger project the 1 MB limit might not be sufficient. Helps to know that up front when making the decision!

Hope this helps!

Answer 3

Worth noting that there are more limitations to the iCloud Key-Value storage than the 1MB limit per user (mentioned in other answers before).

There are some limits to the size of data you can store:

• A maximum, overall key-value store size of 1 MB (per user)
• One key-value pair can't be larger than 1 MB
• You can't store more than 1024 key-value pairs
• A key can't be larger than 64 bytes using UTF-8 encoding