如何禁用文本字段中的空格？ - Swift 界面

Question

我需要使用 Swift UI 在我的用戶名文本字段中禁用空格輸入。 我怎么會go呢？

當前代碼：

@State private var username = ""

CustomInputField(imageName: "at.circle.fill", placeholderText: "Username", text: $username)

Answer 1

您需要的是創建一個可觀察的 object 並在每次字符串更改時過濾空格。 它應該非常簡單：

---

import SwiftUI

struct ContentView: View {
    @ObservedObject private var usernameManager = UsernameManager()
    var body: some View {
        VStack(alignment: .trailing, spacing: 0) {
            Text("Username:")
            TextField(
                usernameManager.string,
                text: $usernameManager.string
            )
            .keyboardType(.asciiCapable)
            .multilineTextAlignment(.trailing)
            .onChange(
                of: usernameManager.string,
                perform: usernameManager.editingChanged
            )
        }.padding(.trailing, 25)
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

---

class UsernameManager: ObservableObject {
    @Published var string: String = ""
    func editingChanged(_ string: String) {
        self.string = string.filter(\.isWhitespace.negated)
    }
}

---

extension Bool {
    var negated: Bool { !self }
}

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