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Hah! You were right, but you shouldn't have been, BabyJ. I added 4 parentheses and it worked: struct ContentView: View {     var body: some View {         VStack {             HStack {                 Button("Hi") { print("Hi!") }                 Button("Hello") { print("Hello!") }                 Button("Good evening") { print("Good evening!") }             }             (EqualWidthHStack()) {                 Button("Hi") { print("Hi!") }                 Button("Hello") { print("Hello!") }                 Button("Good evening") { print("Good evening!") }             }             Image(systemName: "globe")                 .imageScale(.large)                 .foregroundColor(.accentColor)             Text("Hello, world!")         }     } }

Thanks, Bryan. I'll wait for the next version of Xcode and then file a radar.

@jonasmw: I am able to reject invalid strings - which can be created by adding an invalid character from the keyboard or pasting in, in my function entryChecker.check(entry) In my code I have this: TextField("0.0", text: $entry)   .focused($entryFocused)   .onChange(of: entry, perform: checkEntry) func checkEntry(value: String) { entryChecker.check(entry: $entry) } private var entryChecker = FloatEntryValidator(maxlen: 10)  class FloatEntryValidator {     init(maxlen: Int? = nil) { self.maxlen = maxlen}          private let maxlen: Int?     private var prevValidEntry = ""          func check(entry: Binding<String>) {         let value = entry.wrappedValue         if value.isValidFloatEntry(maxlen: maxlen) {             prevValidEntry = value         } else {             entry.wrappedValue = prevValidEntry // Reset         }     }// check      }// FloatEntryValidator public let minusSign: Character = NumberFormatter().minusSign?.first ?? "-" public let decimalSep: Character = NSLocale.current.decimalSeparator?.first ?? "." extension String {     func isValidFloatEntry(maxlen: Int? = nil) -> Bool {  // Values that a TextEdit can be allowed to have as the user enters a floating point number         if let maxlen = maxlen, count > maxlen {           return false         }         var parser = StringParser(self)         parser.skipOptional(char: minusSign)         parser.skipDecimals()         parser.skipOptional(char: decimalSep)         parser.skipDecimals()         return parser.finished     }// isValidFloatEntry } struct StringParser {  // For verifying that a string conforms to specific pattern of sequence. It is valid if finished is true at the end          public init(_ s: String) { string = s; index = s.startIndex }          public let string: String     private var index: String.Index          public var finished: Bool { return index == string.endIndex }          public mutating func skipOptional(char: Character) {  // Skip single character that is permitted at the         if !finished && string[index] == char {             index = string.index(after: index)         }     }// skipOptional(Character)          public mutating func skipDecimals() { // Advances index to first place that is not a decimal digit         while !finished {             let uss = string[index].unicodeScalars             if uss.count > 1 || !CharacterSet.decimalDigits.contains(uss.first!) {                 return             }             index = string.index(after: index)         }     }// skipDecimal      }// StringParser

Thanks for your answers, guys. It may be that SwiftUI has been debugged or improved in some way since I ran into this, but in the end, I was able to simply add this line to the TextField:   TextField("0.0", text: $entry) .onChange(of: entry, perform: checkEntry) given these declarations: @AppStorage("entry") private var entry = "0" (Of course the @AppStorage is not part of this solution) and  func checkEntry(value: String) { entryChecker.check(entry: $entry) }

No, sorry travis78701. I know about that handler. I need to intercept each character. onChange only deals with changes to the whole work when you leave the TextField.

Thanks!I have settled on this code, and it works, and looks obvious:class XBSelectRecord: UIViewController { convenience init(heading: String?) { self.init(nibName: "XBSelectRecord", bundle: nil) self.heading = heading }I find the rules around initializers a bit confusing, so the simplicity is beguiling here.

"Feedback-Assistent.app" should be "Feedback-Assistant.app"