Combine: Resetting Observed Boolean Within Sink() Call?
I Have the Following Code: $Myboolean. Debounce(For: 2, Scheduler: Runloop. Main). removeDuplicates(). Sink { newValue in Self. myBoolean = False...
I have the following code:
$myBoolean
.debounce(for: 2, scheduler: RunLoop.main)
.removeDuplicates()
.sink { newValue in
self.myBoolean = false
.......
...... (closure called every 2 seconds if I don't use `removeDuplicates()`)
}
.store(in: &subscribers)
I am using sink() on a @Published var in my observable object. Different parts of the app can set that boolean to true. When that happens, I want the code in sink() to run.
When that happens I want the code to reset myBoolean to false. So, only when I know the sink() code runs I want the boolean to be set back to false.
How can I set myBoolean back to false only when the sink() code runs without cause endless calls to the sink()?
myBoolean is declared like so:
@Published fileprivate var myBoolean:Bool = false
1 Answer
Using Custom type MyBool and filter operator you can get similar behaviour.
import Combine
class Abc: ObservableObject {
struct MyBool: Equatable {
let value: Bool
let isFromSinkCall: Bool
}
@Published var myBoolean: MyBool = .init(value: true, isFromSinkCall: false)
private var subscribers = Set<AnyCancellable>()
init() {
setup()
}
func setup() {
$myBoolean
.debounce(for: 2, scheduler: RunLoop.main)
.removeDuplicates()
.filter({ !$0.isFromSinkCall })
.sink { newValue in
self.myBoolean = .init(value: false, isFromSinkCall: true)
}
.store(in: &subscribers)
}
}
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