Uber Needle- Swift 的依赖注入框架

Uber Needle- Swift 的依赖注入框架

Needle 是 Uber 开发的一个 Swift 的依赖注入框架。和其他 DI 框架（如Cleanse,Swinject ） 不同的是，Needle 鼓励层次化的 DI结构以及利用代码生成器来确保编译时安全。这样我们在修改应用代码的时候可以更有信心，如果能编译通过就表示其执行就会正常。Needle 更像是 Daggerfor the JVM.

Needle 主要实现以下目标：

通过确保依赖注入代码的编译时安全来提供可靠性确保代码生成是高性能的兼容所有 iOS 应用架构，包括 RIBs, MVx 等.

示例代码

/// This protocol encapsulates the dependencies acquired from ancestor scopes.protocol MyDependency: Dependency { /// These are objects obtained from ancestor scopes, not newly introduced at this scope. var chocolate: Food { get } var milk: Food { get }}/// This class defines a new dependency scope that can acquire dependencies from ancestor scopes/// via its dependency protocol, provide new objects on the DI graph by declaring properties,/// and instantiate child scopes.class MyComponent: Component { /// A new object, hotChocolate, is added to the dependency graph. Child scope(s) can then /// acquire this via their dependency protocol(s). var hotChocolate: Drink { return HotChocolate(dependency.chocolate, dependency.milk) } /// A child scope is always instantiated by its parent(s) scope(s). var myChildComponent: MyChildComponent { return MyChildComponent(parent: self) }}

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