[英]How should I use a guard statement correctly with RxSwift Singles?
Imagine I have a networking client, using RxSwift
to wrap URLSession
.想象一下,我有一个网络客户端,使用RxSwift
来包装URLSession
。
I'd like to use a guard
statement and return an error, however I am getting an error that我想使用一个guard
语句并返回一个错误,但是我收到一个错误
Non-void function should return a value非空函数应该返回一个值
Which makes sense, however I am unsure how to handle this with RxSwift
.这是有道理的,但是我不确定如何使用RxSwift
处理这个RxSwift
。
class NetworkClient {
var task: URLSessionDataTask = URLSessionDataTask()
var session: SessionProtocol = URLSession.shared
var request: URLRequest?
func call<T: Codable>(_ request: URLRequest) -> Single<T> {
return Single<T>.create(subscribe: { [weak self] observer -> Disposable in
guard let `self` = self else { observer(.error(NSError(domain: "", code: 0, userInfo: [:]))); return }
self.task = self.session.dataTask(with: request, completionHandler: { data, response, error in
})
return Disposables.create {
self.task.cancel()
}
})
}
}
Just use:只需使用:
guard let `self` = self else { observer(.error(NSError(domain: "", code: 0, userInfo: [:]))); return Disposables.create() }
However, I have to say I'm not a fan of the class at all.但是,我不得不说我根本不是这门课的粉丝。 First, RxSwift already has a wrapper around dataTask:首先,RxSwift 已经有一个围绕 dataTask 的包装器:
func response(request: URLRequest) -> Observable<(response: HTTPURLResponse, data: Data)>
which can be called by:可以通过以下方式调用:
URLSession.shared.rx.response(request: myRequest)
There's also data(request:)
which will check the statusCode and emit an error if it's not in the 200's.还有data(request:)
将检查 statusCode 并在它不在 200 时发出错误。
You can simply inject the function instead of adding the complexity of wrapping it in an object that provides no value add.您可以简单地注入函数,而不是增加将其包装在不提供任何附加值的对象中的复杂性。 For example:例如:
struct MyViewModel {
init(serverResponse: @escaping (URLRequest) -> Observable<Data>)...
}
Which can be called by:可以通过以下方式调用:
let myViewModel = MyViewModel(serverResponse: URLSession.shared.rx.data)
In testing, you can simply pass a closure that returns Observable<Data>.just(myTestData)
.在测试中,您可以简单地传递一个返回Observable<Data>.just(myTestData)
的闭包。
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