iCloud开发者指南：构建iOS云端应用全攻略

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《iCloud for Developers 英文版》是一本专注于苹果iCloud技术的实用指南，作者Cesare Rocchi以清晰、易于理解的方式讲解了如何在iOS开发中充分利用iCloud的各项核心功能。书中主要涉及三个关键部分：键值存储、文档管理和CoreData，通过详细的示例帮助开发者深入了解并掌握这些技术。首先，Cesare强调了iCloud在自动同步iOS数据方面的强大能力，无论数据是在何处，都能够实现实时同步。他的讲解深入浅出，即使是复杂的概念，也用简单步骤进行拆解，避免了过度简化或隐藏难度。通过阅读这本书，开发者能够迅速构建出在iCloud平台上高效工作的应用程序。这本书得到了多位业内专家的好评。例如，来自Jonathan Penn的评价指出，这本书不仅适合初学者，也能满足有经验的开发者的实际需求，强烈推荐购买。另一位评论者Matt Galloway提到，《iCloud for Developers》对于处理云服务这个通常令人困惑的话题提供了清晰的指导，尤其是对于希望在自己的应用中集成iCloud功能的开发者来说，这是一本不可或缺的参考书籍。 Ray Wenderlich的赞赏则着重于书中的实践性，他强调了Cesare逐步演示如何将iCloud融入真实应用的过程，确保读者在学习过程中不会错过任何关键环节。对于那些渴望在开发过程中充分利用iCloud以提升用户体验的开发者，《iCloud for Developers》无疑是最佳选择。《iCloud for Developers 英文版》是一本实用的教程，旨在帮助iOS开发者深入了解并掌握iCloud技术，无论是为了构建跨设备同步的应用，还是优化云端数据管理，都是开发者提升技能、扩展业务范围的重要参考资料。如果你是iOS开发者，或者对iCloud的潜力感兴趣，这本书将是你探索云服务世界的重要工具。

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

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

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iCloud开发者指南：构建iOS云端应用全攻略

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