do you have any idea what should i do ? You should show your code.

Why don't you simply access the property uuid? for result in results as! [HKQuantitySample] { let uuid = result.uuid print(uuid) let bloodGlucose = result.quantity.description //... } By the way, what is the type of results? You should better avoid risky forced casting as! as far as you can.

I cannot show the all code  I see. Hope your issue will be fixed soon. Good luck.

Can you show enough code for examining what's happening? Simplified full code which builds and runs would be welcome.

how can i define it ? You can find many articles defining strrev, but it would be better for you to do it by yourself if you are learning C-programming.

what should i do ? strrev is not a Standard C function and is not included in the libraries provided with Xcode. You may need to define it by yourself.

there is a error that keeps popping up on line 17. you should show all the error messages.

I'm having the same problem. I tried your work around and it didn't work.  Better start your own thread with enough code to reproduce your issue.

What do you mean by will not work? If your code causes build time errors, you should show all the error messages. If your code causes runtime errors, you should include all the error info as well as all the steps to reproduce the error. If your code runs without errors but generates unexpected results, you need to clarify what you expect, what you actually get and how you can reproduce the issue.

Depends on the Swift code you want to use. Some swift codes cannot be exposed to ObjC. If you are going to write a new Swift class from now on, it is not so difficult to write an ObjC compatible Swift class.

Assuming you can supply all other parameters, you may need to write something like this: var result = Data(count: maximumSizeOfDecryptedData) var numBytesDecrypted: Int = 0 let err = result.withUnsafeMutableBytes {bufPtr in CCCrypt(op, alg, options, key, keyLength, iv, dataIn, dataInLength, bufPtr.baseAddress, bufPtr.count, &numBytesDecrypted) } if err == kCCSuccess { result.count = numBytesDecrypted print(result) //- Use `result` as the decrypted Data } else { print("error: \(err)") }

Even when you apply var to the control variable of for-in statement, the variable holds the copy of each element of the Array as its initial value. You cannot change the original Array when you just modify the control variable. You need to write index based access when you want to modify the Array: for index in myHorses[horseIndex].training.indices { if myHorses[horseIndex].training[index] 1.0 { print("value 1.0 found") myHorses[horseIndex].training[index] = 1.0 } }

Why don't you utilize the sender of the segue? func mapView(_ mapView: MKMapView, didSelect view: MKAnnotationView) { self.performSegue(withIdentifier: "toDetailsVC", sender: view.annotation) //- } override func prepare(for segue: UIStoryboardSegue, sender: Any?) { if segue.identifier == "toDetailsVC" { guard let destinationVC = segue.destination as? DetailsVC, let annotation = sender as? MKPointAnnotation else { print("Unexpected segue: \(segue), \(String(describing: sender))") return } destinationVC.detailsTitle = annotation.title } }

This is the most up to date code Thanks for updating the code. I have no knowledge and no intention to go deep into Firestore, but the lines 56...74 of your code is equivalent to the following: 								if snapshot == nil { 										if let currentRiddle = snapshot?["CurrentRiddle"] as? String { 												self.CurrentRiddle.text = "This Weeks Riddle: " + currentRiddle 												print(currentRiddle) 										} 										if let previousRiddle = snapshot?["CurrentRiddle"] as? String { 												self.PreviousRiddle.text = "Previous Riddle: " + previousRiddle 										} 								} The two if-lets are executed only when snapshot is nil, so, it has no meaning. You might want to do something like this: 								if let snapshot = snapshot { 										if let currentRiddle = snapshot["CurrentRiddle"] as? String { 												self.CurrentRiddle.text = "This Weeks Riddle: " + currentRiddle 												print(currentRiddle) 										} 										if let previousRiddle = snapshot["CurrentRiddle"] as? String { 												self.PreviousRiddle.text = "Previous Riddle: " + previousRiddle 										} 								}

I may be missing something, but why don't you simply add an @State variable to choose the lists? struct SplitView: View { 		@EnvironmentObject var viewRouter: ViewRouter 		@State var list1 = [MyModel]() 		@State var list2 = [MyModel]() 		 		@State var selected: Int = 1 		private var viewingModels: [MyModel] { 				switch selected { 				case 1: 						return list1 				case 2: 						return list2 				default: 						return [] 				} 		} 		var body: some View { 				HStack { 						Button(action: { 								selected = 1 						}){ 								Text("List 1") 						} 						Button(action: { 								selected = 2 						}){ 								Text("List 2") 						} 				} 				List(viewingModels, id: \.ID) { myitem in 								HStack(alignment: .center) { 										VStack(alignment: .leading) { 												Text(myitem.Name) 														.font(.subheadline) 														.fontWeight(.bold) 														Spacer() 										} 								} 				} 				.onAppear(perform: loadList) 				Spacer() 		} 		 }