CHAPTER 1: Welcome to the Apple Watch
13
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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