iCloud（一）综述

最新推荐文章于 2021-08-22 16:15:26 发布

wakin002

最新推荐文章于 2021-08-22 16:15:26 发布

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分类专栏： Objective-C iphone

本文链接：https://blog.youkuaiyun.com/wakin002/article/details/8537438

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iCloud通过Apple ID提供免费服务，使用户能够在所有设备上无线且自动地访问个人内容。它通过网络存储和操作系统集成API实现设备间无需手动同步。本文概述了iCloud能备份的内容，包括key-value对、文档和Core Data，并介绍了如何设置备份和从备份恢复。在iOS设备上，用户可以管理哪些应用数据被备份，并在设备恢复时重新下载应用和数据。

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什么是iCloud？

iCloud is a free service that lets users access their personal content on all their devices—wirelessly and automatically via Apple ID. iCloud does this by combining network-based storage with dedicated APIs, supported by full integration with the operating system. Apple provides server infrastructure, backup, and user accounts, so you can focus on building great iCloud-enabled apps.

The core idea behind iCloud is to eliminate explicit synchronization between devices. A user never needs to think about syncing and your app never interacts directly with iCloud servers. When you adopt iCloud storage APIs as described in this document, changes appear automatically on all the devices attached to an iCloud account. Your users get safe, consistent, and transparent access to their personal content everywhere.

iCloud关注的是“content”，而不是整个application，因为在restore from iCloud的时候，iphone会自动下载你当时备份的版本，如果你备份的版本不存在了，则会下载最新版本。
在你自己设计程序时，你可以将你想要backup的数据添加到iCloud中。

iCloud能backup什么？
Three data types that can stored in iCloud:
1. key-value pairs