Swift-icloud Storage Introduction

for developers, there are two main features of icloud storage: icloud documnet storage, which uses icloud to store user files, such as saving files that some users generate when they use the app, and database files. The second is icloud Key-value data storage, the use of icloud storage key value pairs, mainly to save some program settings information, generally only allow storage dozens of k size.
Note: To test icloud functionality, a paid iOS developer account is required. You must have at least 2 iOS devices to test the Data Sync feature. (IOS simulator can't do icloud storage test)

Swift-icloud Storage Introduction