Working with resources in SwiftPM

[ishanijerin1]

Currently, SwiftPM in iOS development (note) is indispensable as a library management tool that simply manages libraries and external packages, replacing CocoaPods and Cathage, but in recent years, its strong extensibility and flexibility have been utilized as the backbone supporting architectures such as TCA, playing a role in providing functions by combining modules in a complex manner.
(*Test environment: Xcode15.2, Swift5.9)

Perhaps due to this background, I feel like there are iceland email address more and more situations where resources are handled in modules.
On the other hand, if you proceed with the implementation in the same way as in the project file, you may encounter problems such as package loading failing for some reason, or the resource destination not being found at runtime and not being displayed.
Even I, who have never studied this before, have experienced such baptism several times... (;;)
So, I would like to review the basic points of handling resources in SwiftPM.

Explicit bundle specification required
SwiftPM provides a mechanism to refer to resources for each target.
And the most important interface is Bundle.module.

First, hydrangea.jpglet's consider an example of SwiftUI implementation that displays an image file.
In iOS development, when dealing with image files such as PNG and JPEG, it is common to use bundle files called XCAssets, which make it easier to edit and manage them in the Xcode project.

To reference this image resource from the source code, Image(bundle:)you need to specify the image resource name and its bundle as arguments. (If you are using Xcode 15, you can also specify the resource name with ImageResource.)

What if you don't specify the bundle destination in the second argument?
In that case, if the bundle is not specified, the default value nilwill be set. Then, it will try to load Bundle.mainthe image file in the default bundle (the resource bundle in the application itself) hydrangea.jpg, which will result in a failure to obtain the resource.
Nothing will be displayed on the screen.