iCloud开发者指南：构建云应用的实战教程

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"iCloud 开发者教程 (英文版) 是由 Packt Publishing 出版的一本专注于 iOS 平台的开发指南，它旨在帮助开发者深入理解和利用 iCloud 的核心功能。该教程特别关注三个关键特性：Key-Value Store、Documents 和 Core Data，通过详细的步骤和实用示例，使学习过程既易于跟随又富有深度。 Cesar 在书中展示了如何有效地利用 iCloud 进行数据同步，他的讲解风格清晰易懂，避免了过于复杂的技术细节，但同时也确保了读者对技术挑战有全面的认识。他鼓励读者快速构建能够在云端运行的实用应用，无论是对于初次接触 iCloud 的开发者还是希望提升技能的专业人士，这都是一本值得购买的书籍。作者 Jonathan Penn 的评价强调了这本书作为 iCloud 开发的入门指南价值，认为它提供了循序渐进的教学，帮助开发者挖掘每个特性的最大潜力。这表明阅读本书将有助于开发者充分掌握如何在应用程序中整合 iCloud，从而提升用户体验。另一位专家 Matt Galloway 表示，尽管云计算可能让人感到困惑，但 Cesare 的教程将这个复杂主题简化，以逐步指导的方式展示了如何实际地在应用程序中融入 iCloud 功能。如果你的目标是将 iCloud 功能引入你的应用项目，那么这本书无疑是你的理想选择。最后，来自 Ray Wenderlich 的推荐也证实了这本书的价值，他建议下载 Wow! eBook<www.wowebook.com>获取更多关于 iCloud for Developers 的内容。通过自动同步 iOS 数据的功能，这本书将帮助开发者实现高效且无缝的跨设备体验，无论是在 iOS 设备间还是在客户端与服务器之间，都能轻松实现数据一致性。 iCloud 开发者教程 (英文版) 是一本实用且详尽的指南，适合希望通过 iCloud 技术提升 iOS 应用开发能力的开发者，无论你是希望深入了解这些核心功能，还是希望学习如何将其融入自己的项目，这本书都是提升技能的重要资源。"

and the status of its battery. In general, changes are pulled when they are

“appropriate” and won’t degrade performance. On devices, such as phones

with limited battery life, iOS pulls changes only when it needs to, such as

when you open or close a document. The use of metadata, however, guarantees

that the devices that share the application are synchronized and that an iPad

or iPhone are “on the same page,” even if one of them has yet to integrate the

most recent changes made to an application file.

To sum up, when you create or change an application file on a device, its

metadata (name, creation date, and so on) is pushed immediately to iCloud.

When you run the application on another mobile device, that device will be

“aware” that new content is available, but the changes will be replicated there

only when

• you open the file or

• the daemon decides that downloading the file will not impact the

performance of the OS.

Although it’s important to be aware of such policies, you will not need to write

“special” code to address them, since the daemon does all the work. If a file

is unchanged (for example, it was created on the current device or it was

pulled recently from iCloud), its contents will be displayed without delay when

you open it. If changes have occurred, the daemon will start downloading the

file and notify you when it’s done. We will look more closely at this behavior

as we develop our Grocery application.

1.3 Introducing the Grocery Application

To show what’s possible with iCloud, we’re going to build a real application

that uses it. I’ll name the app Grocery. Grocery will allow users to share a

common grocery list between their devices. Each item in the list will have a

name, will include an image (so we can show how to store binary files), and

will be assigned to one or more categories (to show how we can work with

relational data). When a user creates or modifies an item on one device, it

will be replicated on any others that are connected to the same iCloud account.

The application will have two views, as shown in Figure 2, Two views of the

Grocery application, on page 6. The first is a table view that displays the list

of grocery items to be bought. This view also lets users add and delete items.

The second view will appear whenever the user taps an item in the first view

and will display some pertinent details about it, such as its name and an

image of the item.

report erratum • discuss

Introducing the Grocery Application • 5

Download from Wow! eBook <www.wowebook.com>

Create an iCloud-Enabled Application ID

Every application must have an application ID, whether you want to publish

it or simply debug it on a real device, so this is always a mandatory step.

In the iOS Apps section you’ll find a handy menu you can use to navigate its

different parts. To create a new application identifier, click Identifiers and

then click the + sign at the top right.

I have entered Grocery as the App ID description, checked the iCloud option,

left Team ID selected, and entered

com.studiomagnolia.grocery

as a bundle ID. I’ve

used my own reverse domain identifier, which is mine and personal, so if you

try to use it, it will tell you it’s already in use. You will have to create your

own ID to run and debug the application on your devices. Once you have

entered all the data and checked the iCloud option (as in Figure 3, Configuring

the application ID for iCloud, on page 8), click the Continue button at the

bottom.

Now that you have an application ID that’s enabled for iCloud, you can use

it to create a provisioning profile in order to enable the application to run on

your devices.

Create a Provisioning Profile

While you are still in the provisioning portal, create a provisioning profile for

our application. You need this in order to couple the application ID with the

list of devices entitled to run the application as you develop and test it.

Click Provisioning Profiles in the left sidebar, click Development, then click

the + sign at the top left. From the list of options, choose iOS App Development

and click the Continue button at the bottom. On the next screen (Figure 4,

Creating a provisioning profile, on page 9), select the application ID that you

created in the previous step and click Continue. For the next step, select the

certificate to be included in the provisioning profile and click Continue.

Finally, select the list of devices on which you want to test the application.

Remember that you’ll need at least two to explore iCloud. I’ve added some

devices owned by colleagues; be sure to add your own.

https://developer.apple.com/account/overview.action

4. If you have developed application in the past, you’ll have one certificate for development

and one for distribution. Select the one for development. If you don’t have a certificate,

you can create one in the Certificates section. If you need more details about certificates,

you can check out this page at Apple’s support:

https://developer.apple.com/support/technical/

certificates/

report erratum • discuss

Enabling Your Application for iCloud • 7

Download from Wow! eBook <www.wowebook.com>

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iCloud开发者指南：构建云应用的实战教程

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