使用WatchKit和Swift开发苹果手表应用指南

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“Learn WatchKit for iOS(Apress,2015)”是一本专注于使用WatchKit框架和Swift编程语言开发Apple Watch应用的书籍。作者Kim Topley通过一系列简单示例，详细介绍了构建iOS 8版Apple Watch应用所需的所有WatchKit特性和相关技术，最终构建一个完整的天气预报应用示例。在本书中，读者将了解到： 1. Apple Watch应用的基础：书中解释了Apple Watch应用实际上是一个现有iOS应用的扩展，与之打包并一起提交到App Store。这涵盖了Apple Watch应用程序与主iOS应用程序之间的关系和交互。 2. 界面控制器和布局（Chapter 2）：这一章深入讲解如何使用界面控制器来管理Watch应用的用户界面，并探讨了各种布局策略，以适应Apple Watch的小屏幕。 3. Watch用户界面对象（Chapter 3和4）：这部分详细介绍了用于构建Apple Watch界面的各种元素，如图像、文本、按钮等，以及如何定制和交互这些元素以提供良好的用户体验。 4. 控制器导航（Chapter 5）：讨论了在Watch应用中实现页面间的导航，包括如何使用不同类型的界面控制器进行切换和传递数据。 5. 表格和菜单（Chapter 6）：展示了如何在Apple Watch上创建和使用表格来展示数据，以及菜单如何作为用户交互的主要手段。 6. 构建WatchKit应用（Chapter 7）：通过一个实际项目，指导读者如何从零开始构建一个完整的WatchKit应用，涵盖从设计概念到实现的全过程。 7. Glances、设置和Handoff（Chapter 8）：解释了Glances快速视图的创建，设置界面的设计，以及如何利用Handoff功能在Apple Watch和iPhone之间无缝切换和同步数据。 8. 通知（Chapter 9）：详细阐述了如何集成和定制Apple Watch上的本地和远程通知，以提高用户参与度和互动性。通过这本书，开发者可以掌握WatchKit开发的全面技能，从而能够充分利用Apple Watch的功能，创造出富有创新和实用性的应用。书中提供的实例和逐步指导使得学习过程更为直观和易懂，适合初级到中级水平的iOS开发者阅读。

CHAPTER 1: Welcome to the Apple Watch

The image came from a file called SmileyFace@2x.png 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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