7. Resources, Localization, dan Bundle

Resource di SPM

Sejak Swift 5.3, SPM mendukung resource. Cara declare:

swift
.target(
    name: "MyLib",
    resources: [
        .process("Resources"),              // process: optimasi sesuai tipe
        .copy("RawAssets"),                 // copy: as-is, tanpa transformasi
        .process("Sounds/notification.wav"),
    ]
)

Rule	Kapan dipakai
`.process`	Asset catalog, storyboard, xib, plist, json, image. SPM optimize sesuai tipe (compile xcassets, kompres image, dll).
`.copy`	Resource yang harus persis seperti aslinya. ML model, font, raw data.

Mengakses Resource

SPM auto-generate Bundle.module di setiap target yang punya resource:

swift
// Akses image dari resource bundle target
let image = UIImage(named: "logo", in: .module, compatibleWith: nil)

// Load JSON
let url = Bundle.module.url(forResource: "config", withExtension: "json")!
let data = try Data(contentsOf: url)

// Load font
let fontURL = Bundle.module.url(forResource: "Inter-Regular", withExtension: "ttf")!

Gotcha umum: Bundle.main ≠ Bundle.module. Bundle.main adalah app bundle (host). Resource di SPM package selalu di Bundle.module.

Localization

swift
.target(
    name: "MyLib",
    resources: [.process("Resources")],
    swiftSettings: []
)
// Plus: declare default localization di Package

swift
let package = Package(
    name: "MyLib",
    defaultLocalization: "en",
    // ...
)

Layout:

swift

Sources/MyLib/Resources/
├── en.lproj/Localizable.strings
├── id.lproj/Localizable.strings
└── ja.lproj/Localizable.strings

Akses:

swift
let title = String(localized: "welcome.title", bundle: .module)