Issues using LinkPresentation's startFetchingMetadata (for: url)

Question

Created Dec ’22

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I have a swiftUI app that displays rich link information. Am using LinkPresentation's startFetchingMetadata(for :url) to get back metadata.

The code below works

DispatchQueue.global(qos: .background).async {
            self.metadataProvider.startFetchingMetadata(for: url) { (metadata, error) in
                if let error {
                    print("Error retrieving metadata:", error)
                    self.metadataProvider.cancel()
                    completion(false)
                    return
                }

                guard let metadata else {
                    print("Fetched metadata is nil?")
                    self.metadataProvider.cancel()
                    completion(false)
                    return
                }

                DispatchQueue.main.async {
                    self.metadata = metadata
                    self.extractLinkMetadataImage()
                    self.saveLinkMetadata()
                    completion(true)
                }
            }
        }

.. but displays the following messages in the Xcode console.

Q1.) How do I remove the assertions error? I've already set Outgoing Network Connections in my App Group to Yes

Q2.) How do I address the purple main thread warning. I've made sure both the startFetchingMetadata and imageProvider.loadObject calls are being made in DispatchQueue.global(qos: .background).async blocks.

2022-12-28 17:51:11.924604-0800 lrn[40432:8224366] [assertion] Error acquiring assertion: <Error Domain=RBSServiceErrorDomain Code=1 "target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit" UserInfo={NSLocalizedFailureReason=target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit}>

2022-12-28 17:51:11.924760-0800 lrn[40432:8224366] [ProcessSuspension] 0x12201c120 - ProcessAssertion::acquireSync Failed to acquire RBS assertion 'WebProcess Background Assertion' for process with PID=40438, error: Error Domain=RBSServiceErrorDomain Code=1 "target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit" UserInfo={NSLocalizedFailureReason=target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit}

2022-12-28 17:51:12.170643-0800 lrn[40432:8223670] [Security] This method should not be called on the main thread as it may lead to UI unresponsiveness.

2022-12-28 17:51:12.170826-0800 lrn[40432:8223670] [Security] This method should not be called on the main thread as it may lead to UI unresponsiveness.

2022-12-28 17:51:12.336358-0800 lrn[40432:8224255] [assertion] Error acquiring assertion: <Error Domain=RBSServiceErrorDomain Code=1 "target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit" UserInfo={NSLocalizedFailureReason=target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit}>

2022-12-28 17:51:12.336405-0800 lrn[40432:8224255] [ProcessSuspension] 0x12201c120 - ProcessAssertion::acquireSync Failed to acquire RBS assertion 'ConnectionTerminationWatchdog' for process with PID=40440, error: Error Domain=RBSServiceErrorDomain Code=1 "target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit" UserInfo={NSLocalizedFailureReason=target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit}

2022-12-28 17:51:12.336495-0800 lrn[40432:8223670] [ProcessSuspension] ProcessAssertion::remainingRunTimeInSeconds failed to get handle for process with PID=40440

Thanks

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Answer 1

Roushil_Singla OP

Mar ’23

Same issue is only happening to me if we are using Link Preview in UITableView swift.

But for single preview without tableView, it works fine using this code in Swift:

    guard let url = URL(string: strLink) else { return }
    let linkPreview = LPLinkView()
    let provider = LPMetadataProvider()

    Task {
        let metaData = try await provider.startFetchingMetadata(for: url)
        linkPreview.metadata = metaData
        &#x2F;&#x2F;Display your linkPreview
    }

For Closures

    provider.startFetchingMetadata(for: url) { [weak self] metaData, error in
        if let data = metaData, error == nil, let _self = self {
            DispatchQueue.main.async {
                linkPreview.metadata = data
                &#x2F;&#x2F;Display your linkPreview
            }
        }
   }

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