funcdownload(_ url:URL)->AsyncThrowingStream<Status,Error>{returnAsyncThrowingStream{continuationin/// 配置一个终止回调,以了解你的流的生命周期。continuation.onTermination={@Sendable statusinprint("Stream terminated with status \(status)")}// ..}} 回调在流终止时被调用,它将告诉你你的流是否还活着。
https://developer.apple.com/documentation/swift/asyncstream AsyncStream 概念 一个异步序列。 ️由调用延续来产生新元素 的闭包而生成。如下: structAsyncStream<Element>//AsyncStream是structextensionAsyncStream:AsyncSequence{//遵循AsyncSequence协议 理解 ️AsyncStream本质是一种用于异步处理数据流的抽象模型...
funcdownload(_url:URL)->AsyncThrowingStream<Status,Error>{returnAsyncThrowingStream{continuationin/// 配置一个终止回调,以了解你的流的生命周期。continuation.onTermination={@Sendablestatusinprint("Stream terminated with status\(status)")}// ..}} 回调在流终止时被调用,它将告诉你你的流是否还活着。我...
extensionFileDownloader{funcdownload(_url:URL)->AsyncThrowingStream<Status,Error>{returnAsyncThrowingStream{continuationindo{tryself.download(url,progressHandler: {progressincontinuation.yield(.downloading(progress)) },completion: {resultinswitchresult{case.success(letdata):continuation.yield(.finished(data))c...
Combine 框架几乎没有什么变化，不少人都提出了疑问：苹果是否打算使用 AsyncSequence 和 AsyncStream ...
再和 Swift 特有的 guard 机制结合,可谓如虎添翼。还记得之前的代码里,我们需要检查错误并明确的调用completion回调么?现在我们只需要一个try就解决了。就像调用有 throws 标记的函数需要 try 一样,调用 async 标记的函数,需要用await。如果一个表达式内含有多个 async 函数调用,我们只需要一次 await,就像有多个 ...
results, you probably won’t be able to useAsyncStream(unfolding:). While it’s the simplest and least error-prone way to build an async stream, it’s also the way that I’ve found to be most limiting and it doesn’t often fit well with bridging existing code over to Swift ...
AsyncStream allows you to easily create asynchronous sequences and quickly adapt old APIs to Swift concurrency.
the async stream implementations should function analogously with respect to multi-consumption, and the corresponding documentation should accurately reflect their behaviors. in particular, the throwing variant should behave in the same manner that the non-throwing stream does. Environment Apple Swift versio...
Swift Swift Standard Library Concurrency AsyncStream Structure AsyncStream An asynchronous sequence generated from a closure that calls a continuation to produce new elements. iOS 13.0+iPadOS 13.0+Mac Catalyst 13.0+macOS 10.15+tvOS 13.0+visionOS 1.0+watchOS 6.0+ struct AsyncStream<Element>...