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DIY DI sam : @iwantmyrealname github.com/sammyd/iOSCon2018_DIYDI
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single tons
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single tons
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one instance
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network controller
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file access
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animation engine
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what's the problem?
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global access
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class Manager { static let shared = Manager() private init() }
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class Manager { static let shared = Manager() private init() } let manager = Manager.shared
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bad
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hidden state
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hard to test
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possible solution...
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don't allow global access
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give objects what they need
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inject their dependencies
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hierarchy problem
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alternative
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a way to find dependencies
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contained facsimile for global state
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dependency container
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protocol NetworkManagerProvider { var networkManager: NetworkManager { get } }
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protocol NetworkManagerProvider { var networkManager: NetworkManager { get } } protocol DataStoreProvider { var dataStore: DataStore { get } }
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protocol NetworkManagerProvider { var networkManager: NetworkManager { get } } protocol DataStoreProvider { var dataStore: DataStore { get } } protocol ViewControllerFactory { func createBeautifulVC() -> UIViewController ... }
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class DependencyContainer: NetworkProvider, DataStoreProvider, ViewControllerFactory { ... }
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class MyViewController { typealias DependencyProvider = NetworkManagerProvider & ViewControllerFactory ... }
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class MyViewController { typealias DependencyProvider = NetworkManagerProvider & ViewControllerFactory private let provider: DependencyProvider ... }
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class MyViewController { typealias DependencyProvider = NetworkManagerProvider & ViewControllerFactory private let provider: DependencyProvider private lazy var dataStore = provider.dataStore ... }
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class MyViewController { typealias DependencyProvider = NetworkManagerProvider & ViewControllerFactory private let provider: DependencyProvider private lazy var dataStore = provider.dataStore init(dependencyProvider: DependencyProvider) { self.dependencyProvider = dependencyProvider } }
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by no means perfect
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but better than before
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DI/IoC popular with the grownups
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consider it when you're struggling
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@iwantmyrealname github.com/sammyd/iOSCon2018_DIYDI