I'm trying to make a TimelineProvider
for iOS 16 WeatherKit
and I'm struggling with how I meet the protocol signature and and use the new async api.
Here's my code:
struct WeatherProvider: TimelineProvider {
func getSnapshot(in context: Context, completion: @escaping (WeatherEntry) -> ()) {
let weather = try? await WeatherService.shared.weather(for: currentLocation)
let entry = WeatherEntry(date: Date(), wind: nil, locationAuthStatus: nil)
completion(entry)
}
// etc
}
Compiling this leads throws a build error 'async' call in a function that does not support concurrency
.
The auto fix suggests: Add 'async' to function 'getSnapshot(in:completion:)' to make it asynchronous
But if you do that the struct no longer conforms: Type 'WeatherProvider' does not conform to protocol 'TimelineProvider'
This feels like it should be trivial but I can't find any examples on how to do it.
CodePudding user response:
Just put everything in a Task
and you are good to go. Task
is a good way to bridge completion handler syntax to the new async/await, or more general execute async code in a synchronous context:
Task{
let weather = try? await WeatherService.shared.weather(for: currentLocation)
let entry = WeatherEntry(date: Date(), wind: nil, locationAuthStatus: nil)
completion(entry)
}