41 lines
1.4 KiB
Swift
41 lines
1.4 KiB
Swift
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import Foundation
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@objc(WMFBackgroundFetcher) public protocol BackgroundFetcher: NSObjectProtocol {
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func performBackgroundFetch(_ completion: @escaping (UIBackgroundFetchResult) -> Void)
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}
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@objc(WMFBackgroundFetcherController) public class BackgroundFetcherController: WorkerController {
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var fetchers = [BackgroundFetcher]()
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@objc public func add(_ worker: BackgroundFetcher) {
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fetchers.append(worker)
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}
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@objc public func performBackgroundFetch(_ completion: @escaping (UIBackgroundFetchResult) -> Void) {
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let identifier = UUID().uuidString
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delegate?.workerControllerWillStart(self, workWithIdentifier: identifier)
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fetchers.asyncMap({ (fetcher, completion) in
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fetcher.performBackgroundFetch(completion)
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}) { [weak self] (results) in
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var combinedResult = UIBackgroundFetchResult.noData
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resultLoop: for result in results {
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switch result {
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case .failed:
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combinedResult = .failed
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break resultLoop
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case .newData:
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combinedResult = .newData
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default:
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break
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}
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}
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completion(combinedResult)
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guard let strongSelf = self else {
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return
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}
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strongSelf.delegate?.workerControllerDidEnd(strongSelf, workWithIdentifier: identifier)
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}
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}
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}
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