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You can re-write it like this:     let result = randomIV.withUnsafeMutableBytes {(bufPointer: UnsafeMutableRawBufferPointer) in         SecRandomCopyBytes(kSecRandomDefault, bufPointer.count, bufPointer.baseAddress!)     } Or a little more simply:     let result = randomIV.withUnsafeMutableBytes {         SecRandomCopyBytes(kSecRandomDefault, $0.count, $0.baseAddress!)     }

You should better include clear sentences explaining what you want to ask here. Have you come here to just report your bug? Or want to find a solution to fix the bug? Anyway, your code lacks one pair of parentheses at about 32nd line: VStack(alignment: .center, spacing: 10) { Text("Computers Choice: \(options[computersChoice].name)") .fontWeight(.bold) .padding //<- Image("\(options[computersChoice].name)") .resizable() .frame(width: 100, height: 100) .padding() Text("You need to \(winOrLose ? "Win" : "Lose")") .fontWeight(.bold) } So, you need to fill parentheses there: VStack(alignment: .center, spacing: 10) { Text("Computers Choice: \(options[computersChoice].name)") .fontWeight(.bold) .padding() //<- Image("\(options[computersChoice].name)") .resizable() .frame(width: 100, height: 100) .padding() Text("You need to \(winOrLose ? "Win" : "Lose")") .fontWeight(.bold) } Usual compilers can detect where this sort of simple syntax error is occurring, you can send a bug report to swift.org as suggested.

In your code, requestTest is a name of a function. Using a function name in a condition of if-statement does not make sense. To use if-statement, you need an expression returning Bool. Please try something like this: import SwiftUI struct ContentView: View { @State private var tweetID = "" @State private var tweetStatus = "" @State private var response = "" @State var showAlert = false @State var sendToWebhook = false @State var isRequestInProgress: Bool = false //<- var body: some View { NavigationView { Form { Section(footer: Text("Test")) { TextField("Field to place response data", text: $response) TextEditor( text: $tweetStatus) .frame(height: 100) } Section { Button("Get Data") { // Where progress should start before function //↓Writing a View in an action closure does not make sensse //ProgressView("Test", value: 100, total: 100) requestTest() { results in response = results if response == "No Data!" { showAlert = true } } } if isRequestInProgress { //<- ProgressView() } } } .alert(isPresented: $showAlert) { Alert(title: Text("Tweet Sent"), message: Text("Your Tweet is sent! Your Tweet ID is shown in the field"), dismissButton: .default(Text("OK"))) } } } func requestTest(completion: @escaping(String) -> ()) { if let url = URL(string: "https://requestbin.net/r/ag4ipg7n") { var request = URLRequest(url: url) request.httpMethod = "POST" request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type") var components = URLComponents(url: url, resolvingAgainstBaseURL: false)! components.queryItems = [ URLQueryItem(name: "TweetID", value: response), URLQueryItem(name: "Status", value: tweetStatus)] if let query = components.url!.query { request.httpBody = Data(query.utf8) } self.isRequestInProgress = true //<- let task = URLSession.shared.dataTask(with: request) { data, response, error in //↓ defer { DispatchQueue.main.async { self.isRequestInProgress = false } } if let data = data, let apiResponse = String(data: data, encoding: .utf8) { // IF Completed, these actions are shown below completion(apiResponse) self.showAlert = true tweetStatus = "" } else { completion("No Data!") } } task.resume() } } }

Is there something I'm missing? The code you have shown looks correct. One possibility, have you started your project with StartingProject? (Included in the Project download link.) You need Assets.xcassets to make the code work.

I would write it like this: let p_vertexData = vertexData.withUnsafeBufferPointer {bufPtr in Data(buffer: bufPtr) }