我正在尝试使用Swinject注入依赖项,但我不知道我在做什么错。
我有协议,可以处理注册用户。
protocol AuthServiceProtocol {
func registerUser(email: String, password: String, completion: @escaping CompletionHandler) }
并遵循此协议的类可以说明所有逻辑:
class AuthService: AuthServiceProtocol {
func registerUser(email: String, password: String, completion: @escaping CompletionHandler) {
let lowerCaseMail = email.lowercased()
let body: [String: Any] = [
"email": lowerCaseMail,
"password" : password
]
Alamofire.request(URL_REGISTER, method: .post, parameters: body, encoding: JSONEncoding.default, headers: HEADER).responseString { (response) in
if response.result.error == nil {
completion(true)
} else {
completion(false)
debugPrint(response.result.error as Any)
}
}
}
}
因此,在AppDelegate中,我们注册了容器,它看起来像:
let container = Container() { container in
container.register(AuthServiceProtocol.self) { _ in AuthService() }.inObjectScope(.container)
container.register(CreateAccountVC.self) { r in
let controller = CreateAccountVC()
controller.authService = r.resolve(AuthServiceProtocol.self)
return controller
}
}
但在CreateAccountVC中,authService为空。任何想法我该怎么做?
CreateAccountVC是ViewController的子类,我已经尝试通过属性和构造函数对其进行尝试,但它一直都为零。
最佳答案
检查您的代码:
var container : Container {
let container = Container()
container.register(AuthServiceProtocol.self) { _ in AuthService() }.inObjectScope(.container)
container.register(CreateAccountVC.self) { r in
let controller = CreateAccountVC()
controller.authService = r.resolve(AuthServiceProtocol.self)
print(r.resolve(AuthServiceProtocol.self))
return controller
}
return container
}
您已经计算了属性,每次调用它都会创建一个NEW Container对象。
将代码重构为只有一个容器,我相信您会很好。
编辑:
这是一个工作代码段。
下面是一个小型包装器类,用于抽象具体的DI服务(以防Swinject有一天被其他东西取代):
import Swinject
public class ConfigurationProvider {
// Currently using Swinject
private let backingService = Container()
// Singleton
public static let shared = ConfigurationProvider()
// Hidden initializer
private init() {}
// MARK: - Bind / Resolve
public func bind<T>(interface: T.Type, to assembly: T) {
backingService.register(interface) { _ in assembly }
}
public func resolve<T>(interface: T.Type) -> T! {
return backingService.resolve(interface)
}
}
// Extension methods to ignore 'shared.' call, like:
// ConfigurationProvider.bind(interface: IAssembly, to: Assembly())
// ConfigurationProvider.resolve(interface: IAssembly)
public extension ConfigurationProvider {
static func bind<T>(interface: T.Type, to assembly: T) {
ConfigurationProvider.shared.bind(interface: interface, to: assembly)
}
static func resolve<T>(interface: T.Type) -> T! {
return ConfigurationProvider.shared.resolve(interface: interface)
}
}
用法:
class RSAuthLoginModuleAssembly: IAuthLoginModuleAssembly {
}
// Register:
ConfigurationProvider.bind(interface: IAuthLoginModuleAssembly.self, to: ConcreteAuthLoginModuleAssembly())
// Resolve:
guard let assembly = ConfigurationProvider.resolve(interface: IAuthLoginModuleAssembly.self) else {
throw NSError(domain: "Assembly cannot be nil", code: 999, userInfo: nil)
}