掌握iOS WatchKit开发：从入门到实战
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立即下载 "《学习iOS WatchKit》是一本针对Apple Watch应用程序开发的专业指南，作者是Kim Topley。这本书深入浅出地介绍了如何使用Swift编程语言与WatchKit技术来创建功能丰富的Apple Watch应用。全书共分为九章，涵盖了从入门到进阶的内容。
第一章“欢迎来到Apple Watch”引导读者熟悉Apple Watch的基本概念，回顾了技术进步带来的硬件变化，强调了早期计算机与现代小巧便携设备的对比。随着科技的发展，开发者可以利用小巧的Apple Watch为用户提供全新的交互体验。
第二章和第三章主要讲解接口控制器（Interface Controllers）和布局设计，这是构建用户界面的基础。开发者会学习如何设计布局、组织屏幕以及创建自定义视图。
第四章和第五章深入探讨更复杂的用户界面对象和控制器导航，使读者能够构建更加动态和流畅的应用流程，确保用户体验的一致性。
第六章涵盖了表格和菜单的创建，这对于数据展示和用户选择功能至关重要，如在表盘上显示实时信息或提供选项列表。
第七章是实际操作部分，指导读者如何将理论知识应用于实践，从头开始构建一个完整的WatchKit应用，包括应用架构的设计和实现。
第八章涉及Glances（小部件）、设置选项以及Handoff（设备间的无缝衔接），这些都是Apple Watch独特功能，能让用户在不同设备间保持数据同步和便捷操作。
第九章着重介绍通知机制，如何设计符合Apple Watch用户体验规范的通知，提升用户的参与度和满意度。
《Learn WatchKit for iOS》是一本实用的教程，无论你是初次接触Apple Watch开发的初学者，还是希望提升现有技能的开发者，都能从中获得宝贵的知识和实践经验。通过跟随书中的步骤和示例，读者可以掌握开发出引人注目的Apple Watch应用程序所需的技能。"
CHAPTER 1: Welcome to the Apple Watch
13
The image came from a file called [email protected] and it was added
to the 2x section of the entry in the asset catalog. The Apple Watch has
a Retina screen, so all images must be prepared at double the required
point size. In this case, the image is a 206-pixel square, which maps to a
103-point square from the point of view of the WatchKit software.
Back in the storyboard, make sure the Attributes Inspector is open, select
the Image object, and then choose SmileyFace from the Image selector. The
smiley face image appears in the storyboard, but it’s still aligned to the left
of the screen. You can center the image using the Horizontal selector from
the Position section, as you did with the label.
Before running the application, let’s give it a title. To do this, select the
interface controller by clicking it in the Document Outline and then enter
Hello in the Title field in the Attributes Inspector. Press the Return button,
and the title appears at the top left of the watch screen (see Figure 1-11).
Now let’s add an image below the label. Drag an Image object from the
Object Library and drop it onto the storyboard. It doesn’t matter where you
release the mouse as long as it’s over the watch screen and somewhere
below the label—the image will be positioned underneath the label, up
against the left edge of the screen.
The Image object is empty until you give it something to display. In the
1 – HelloWatch Icon folder of the book’s example source code archive,
you’ll find a suitable image. In the Project Navigator, select Image.xcassets
from the HelloWatch WatchKit App group to open the WatchKit app’s asset
catalog and then drag the image into the editor area and drop it (see
Figure 1-10).
Note The images that you plan to use in the WatchKit application should be
added to the asset catalog of the WatchKit application itself. As you’ll see later,
it is possible to programmatically install images from WatchKit extension’s asset
catalog, but images configured in the storyboard must come from the WatchKit
application’s asset catalog.
Figure 1-10. Adding an image to the WatchKit application
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