Unconventional Shapes #1 - Actors with AsyncSequences
#SwiftUI apps use threads for UI, model and network. This can glitch and crash. Should you cross your fingers, or add complex locks?
#Swift #Concurrency can help! Actors are a new way to code the data model in your swift App. Actor methods give safe async access to one value from the model's data.
What if you need more than one result, like streamed posts from the network?
Use #AsyncSequence! Here's today's Unconventional Shape:
![screenshot of swift code for a SwiftUI view which uses an actor that returns an async sequence
struct ContentView: View {
@State var anActor = ActorWithAsyncPublisher()
@State var numbers: [Int] = []
var body: some View {
List(numbers, id: \.self) { value in
Text("\(value)")
}
.task {
do {
for try await value in await anActor.numbers() {
self.numbers += [value]
}
} catch {
self.numbers += [-1]
}
}
}
}](/proxy/post_attachment/22872/f7e4f817bc.png "screenshot of swift code for a SwiftUI view which uses an actor that returns an async sequence
struct ContentView: View {
@State var anActor = ActorWithAsyncPublisher()
@State var numbers: [Int] = []
var body: some View {
List(numbers, id: \.self) { value in
Text(\"\(value)\")
}
.task {
do {
for try await value in await anActor.numbers() {
self.numbers += [value]
}
} catch {
self.numbers += [-1]
}
}
}
}")
Edited 2y ago