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I have the code below which works just fine. getTwinklingGem returns type MyGem. What I cannot figure out is if there is a proper syntax for writing the NOT into the if statement. Am still too new to Swift. This works, but seems lengthy: if let twinkling = getHighGem(), twinkling != nil Is this the proper way to test for a nil return? if let twinkling = getHighGem() as? MyGem if let twinkling = getTwinklingGem() { print ("not nil") }

As the title says I'm trying to use a to-one relationship as a sectionIdentifier in a @SectionedFetchRequest. The compiler is happy but there's a runtime crash: Could not cast value of type '_NSCoreDataTaggedObjectID' (0x146c0f750) to 'MyApp.ServiceCategory' (0x104c4b3a0). The fetch request: @SectionedFetchRequest(     sectionIdentifier: \Service.serviceCategory,     sortDescriptors: [       SortDescriptor(\Service.active, order: .reverse),       SortDescriptor(\Service.displayText)     ],     predicate: NSPredicate(format: "%K = %d", #keyPath(Service.active), true),     animation: .default   ) var sectionedServices: SectionedFetchResults<ServiceCategory?, Service> ... and the breaking runtime code: ForEach(sectionedServices /* here */) { section in Section(header: Text(section.id?.displayText ?? "")) { ForEach(section) { svc in Text(svc.displayText ?? "") } } } The request works if I switch out the sectionIdentifier for the active property (which is a Bool property rather than a relationship). It also works if I switch it out for displayText which is an optional String, so it seems to be a problem trying to section by a relationship rather than with it being an optional. The error suggests the request is returning a Core Data fault rather than an object but my attempts to somehow unwrap this haven't gone very far. Any thoughts would be greatly appreciated!

I am getting a strange crash (see call stack in attached screenshot). I am looking for ideas/hints how to track down what the issue is?

I'm building a View for account creation, and have a number of text fields (first name, last name, email, etc.). It seems like the natural choice is to embed these TextField() views into a Form, but given that Form is built on UITableView (as I understand it) it becomes challenging and requires some workarounds to add modifiers like .background() and have them perform the way I want them to. If, instead of embedding them in a Form, I just use a VStack, there's no problem. So my question is, is there any reason I should put up with the trouble and use Form? Does it give me any added functionality? Is it considered bad or unclean code to not use Form? From what I can tell, there don't seem to be any real benefits, right?

Hi, In my WKWebView I can't open blob links if there is target blank. a href="https://..." --> ok <a href="https://..." target="_blank" --> ok a href="blob:..." --> ok a href="blob:..." target="_blank" --> NOK!!! I've implemented this method : func webView(_ webView: WKWebView, createWebViewWith configuration: WKWebViewConfiguration, for navigationAction: WKNavigationAction, windowFeatures: WKWindowFeatures) -> WKWebView? { print("\n=================\nTARGET BLANK\n") ... } In case of a href="blob:..." target="_blank" I don't have any print in the console. Could you help me ? Julien

I'm trying to import a class with testable however, Im getting undefined symbol error

Text in iOS 15 Beta 1 (Xcode 13 Beta 1) only handles markdown when string literal was passed to initializer. struct MarkdownTest: View {   var text: String = "**Hello** *World*"   var body: some View {     VStack {       Text("**Hello** *World*") // will be rendered with markdown formatting       Text(text) // will NOT be rendered according to markdown     }   } } struct MarkdownTestPreviews: PreviewProvider {   static var previews: some View {     MarkdownTest()   } } Is this a known bug or do I have to create an entry in Feedback Assistant?

Hello I got the problem that the Xcode does not support the Swift version 3.0 on Xcode version 12.5 Is there any way to config the Swift version on Unity? Or how to determine which plugin using Swift version 3.0 in Unity Project?

public func writeData(connection: AVCaptureConnection, video: AVCaptureConnection, audio: AVCaptureConnection, buffer: CMSampleBuffer, isFrontPosition: Bool = false) {     movieWritingQueue.async { [weak self] in       guard let self = self else { return }       self.numberOfThread += 1       if connection == video {         if !self.readyToRecordVideo {           if let sample = CMSampleBufferGetFormatDescription(buffer) {             self.readyToRecordVideo = (self.setupAssetWriterVideoInput(sample)) == nil           }         }         if self.inputsReadyToRecord() {           self.writeSampleBuffer(sampleBuffer: buffer, mediaType: .video)         }       } else if connection == audio {         if !self.readyToRecordAudio {                       if let sample = CMSampleBufferGetFormatDescription(buffer) {             self.readyToRecordAudio = (self.setupAssetWriterAudioInput(sample)) == nil           }                     }         if self.inputsReadyToRecord() {           self.writeSampleBuffer(sampleBuffer: buffer, mediaType: .audio)         }       }     }   }       public func writeSampleBuffer(sampleBuffer: CMSampleBuffer, mediaType: AVMediaType) {     if movieWriter?.status == .unknown {       if let mw = movieWriter, mw.startWriting() {         mw.startSession(atSourceTime: CMSampleBufferGetPresentationTimeStamp(sampleBuffer))       } else {         logger.i(" --- \(String(describing: movieWriter?.error)) --- ")       }     }           if movieWriter?.status == .writing {       var isVideo = false       if mediaType == .video {         isVideo = true       }               let sampleTime = CMSampleBufferGetPresentationTimeStamp(sampleBuffer)       let last = isVideo ? lastVideoTimeOrigin : lastAudioTimeOrigin       if let lastTime = last, lastTime.isValid, lastTime.seconds != 0 {         let lastSecond = lastTime.seconds         let sampleSecond = sampleTime.seconds         if sampleSecond - lastSecond < 0.0016 {           print("drop")           return         }       }               // 记录暂停上一次录制的时间       var ptsOrigin = CMSampleBufferGetPresentationTimeStamp(sampleBuffer)       let durOrigin = CMSampleBufferGetDuration(sampleBuffer)       if durOrigin.value > 0 {         ptsOrigin = CMTimeAdd(ptsOrigin, durOrigin)       }       if isVideo {         lastVideoTimeOrigin = ptsOrigin       } else {         lastAudioTimeOrigin = ptsOrigin       }               if isDiscont {         isDiscont = false         // 计算暂停的时间         var pts = CMSampleBufferGetPresentationTimeStamp(sampleBuffer)         let last = isVideo ? lastVideoTime : lastAudioTime         if let last = last, last.isValid {           if let timeOffset = timeOffset, timeOffset.isValid {             pts = CMTimeSubtract(pts, timeOffset)           }           let offset = CMTimeSubtract(pts, last)           if timeOffset?.value == 0 {             timeOffset = offset           } else {             timeOffset = CMTimeAdd(timeOffset ?? CMTime(), offset);           }         }         lastVideoTime?.flags = .valid         lastAudioTime?.flags = .valid       }               var copyBuffer = sampleBuffer       if timeOffset?.value ?? CMTime().value > 0 {         //根据得到的timeOffset调整         if let buffer = adjustTime(sample: copyBuffer, offset: timeOffset) {           //copyBuffer = buffer         }       }       // 记录暂停上一次录制的时间       var pts = CMSampleBufferGetPresentationTimeStamp(copyBuffer)       let dur = CMSampleBufferGetDuration(copyBuffer)       if dur.value > 0 {         pts = CMTimeAdd(pts, dur)       }       if isVideo {         lastVideoTime = pts       } else {         lastAudioTime = pts       }               if mediaType == .video {         guard let mvi = movieVideoInput, mvi.isReadyForMoreMediaData else { return }         if !mvi.append(copyBuffer) {           logger.i(" --- \(String(describing: movieWriter?.error)) --- ")         }       } else if mediaType == .audio {         guard let mai = movieAudioInput, mai.isReadyForMoreMediaData else { return }         if !mai.append(copyBuffer) {           logger.i(" --- \(String(describing: movieWriter?.error)) --- ")         }       }         //      var copyBuffer: CMSampleBuffer? = sampleBuffer //      CMSampleBufferCreateCopy(allocator: nil, sampleBuffer: sampleBuffer, sampleBufferOut: &copyBuffer) //      if timeOffset?.value ?? CMTime().value > 0 { //        //根据得到的timeOffset调整 //        if let buffer = adjustTime(sample: copyBuffer, offset: timeOffset) { //          copyBuffer = buffer //        } //      } //      guard let buffer = copyBuffer else { //        return //      } //      // 记录暂停上一次录制的时间 //      var pts = CMSampleBufferGetPresentationTimeStamp(buffer) //      let dur = CMSampleBufferGetDuration(buffer) //      if dur.value > 0 { //        pts = CMTimeAdd(pts, dur) //      } //      if isVideo { //        lastVideoTime = pts //      } else { //        lastAudioTime = pts //      } // //      if mediaType == .video { //        guard let mvi = movieVideoInput, mvi.isReadyForMoreMediaData else { return } //        if !mvi.append(buffer) { //          logger.i(" --- \(String(describing: movieWriter?.error)) --- ") //        } //      } else if mediaType == .audio { //        guard let mai = movieAudioInput, mai.isReadyForMoreMediaData else { return } //        if !mai.append(buffer) { //          logger.i(" --- \(String(describing: movieWriter?.error)) --- ") //        } //      } //      copyBuffer = nil     }   }       //调整媒体数据的时间   func adjustTime(sample: CMSampleBuffer?, offset: CMTime?) -> CMSampleBuffer? {     guard let sample = sample, let offset = offset else {       return nil     }     var count: CMItemCount = 0     CMSampleBufferGetSampleTimingInfoArray(sample, entryCount: 0, arrayToFill: nil, entriesNeededOut: &count)     let pInfo = UnsafeMutablePointer<CMSampleTimingInfo>.allocate(capacity: MemoryLayout.size(ofValue: CMSampleTimingInfo.self) * count)     CMSampleBufferGetSampleTimingInfoArray(sample, entryCount: count, arrayToFill: pInfo, entriesNeededOut: &count)     for index in 0...count {       pInfo[index].decodeTimeStamp = CMTimeSubtract(pInfo[index].decodeTimeStamp, offset)       pInfo[index].presentationTimeStamp = CMTimeSubtract(pInfo[index].presentationTimeStamp, offset)     }     var sout: CMSampleBuffer?     CMSampleBufferCreateCopyWithNewTiming(allocator: nil, sampleBuffer: sample, sampleTimingEntryCount: count, sampleTimingArray: pInfo, sampleBufferOut: &sout)     pInfo.deallocate()     return sout   } i need pause when i take movie ,then i need change sampleBuffers timestamp. but when i add the adjust func. thread crash. i guess the sampleBuffer release before i use it so i try to copy it ,but when i copy the sampleBuffers .the buffers all drop. the reason is outofBuffers . when i used objc, i use CFRetain(). but i cant find that func in swift and i use DispatchQueue, so i cant find exactly where crash

invalid mode 'kCFRunLoopCommonModes' provided to CFRunLoopRunSpecific - break on _CFRunLoopError_RunCalledWithInvalidMode to debugI get this warning when I tap either of the switches shown below. I've tried capturing the switch state in a var and using that to trigger the do/catch statement but no joy. I've even tried pulling the do/catch into separate functions and I still get the warning. Has anybody else run into this and how did you fix it?@IBAction func greetingFormat_Tapped(_ sender: UISwitch) { let theQuery = theTable_Settings.filter(settingID == 1) if sender.isOn { do { if try Database.shared.databaseConnection!.run(theQuery.update(greeting_Format &lt;- "true")) &gt; 0 { greetingFormatLabel_Outlet.text = NSLocalizedString("HelloMrSmith_String", comment: "") } else { print("greeting format true not found") } } catch { print("greeting format true update failed! Error: \(error)") } } else { do { if try Database.shared.databaseConnection!.run(theQuery.update(greeting_Format &lt;- "false")) &gt; 0 { greetingFormatLabel_Outlet.text = NSLocalizedString("HiJoe_String", comment: "") } else { print("greeting format false not found") } } catch { print("greeting format false update failed! Error: \(error)") } } }@IBAction func nonrefundableSwitch_Tapped(_ sender: UISwitch) { let theQuery = theTable_Settings.filter(settingID == 1) var itsOn: String = "" if sender.isOn { itsOn = "true" } else { itsOn = "false" } if itsOn == "true" { do { if try Database.shared.databaseConnection!.run(theQuery.update(nonRefundable_Bool &lt;- "true")) &gt; 0 { depositDueLabel_Outlet.text = NSLocalizedString("nonRefunddepositisdue_String", comment: "") } else { print("nonRefundable true not found") } } catch { print("nonRefundable true update failed! Error: \(error)") } } else { do { if try Database.shared.databaseConnection!.run(theQuery.update(nonRefundable_Bool &lt;- "false")) &gt; 0 { depositDueLabel_Outlet.text = NSLocalizedString("depositisdue_String", comment: "") } else { print("nonRefundable false not found") } } catch { print("nonRefundable false update failed! Error: \(error)") } } }

DispatchQueue.main.asyncAfter(deadline: .now() + 10) { //code } code within asyncAfter will get executed after 10 seconds. Is there a way to cancel execution before 10 seconds

The following simple function will cause Xcode 12E262 to have "Abort: trap 6" during compilation. import UIKit import CoreData class ViewController: UIViewController {     func xyz() {         let container = NSPersistentContainer(name: "xyz")         let batchUpdateRequest = NSBatchUpdateRequest(entityName: "xyz")         let batchUpdateResult = try! container.viewContext.execute(batchUpdateRequest) as? NSBatchUpdateResult         guard let batchUpdateResult = batchUpdateResult else { return }     }     override func viewDidLoad() {         super.viewDidLoad()         // Do any additional setup after loading the view.     } } We will not observe "Abort: trap 6", if under Build Settings, we are using "Optimize for Speed" in Debug, instead of "No Optimization" We can also avoid "Abort: trap 6", if we change the following code guard let batchUpdateResult = batchUpdateResult else { return } to guard let batchUpdateResult2 = batchUpdateResult else { return } May I know, why is it so? A simpler code example to reproduce problem, without CoreData would be import UIKit class ViewController: UIViewController {     func getAny() throws -> Any? {         return nil     }     func xyz() {         let name = try! getAny() as? UIViewController         guard let name = name else { return }     }     override func viewDidLoad() {         super.viewDidLoad()         // Do any additional setup after loading the view.     } }

If my value is higher that 10, a notification should pop up saying, "You are beyond the radius" let value = userLocation.distance(from: pointLocation) if (value > 10){ //trigger notification } I am not sure of how to do this, please help.

I've looked around quite a bit at the EventKit documentation and done all the searching I could think of, as well as examining the EKCalendar and EKEventStore types. Trying to find out how to view, modify, and create groups of reminders lists.