根据焦点文本字段更改线条的颜色

Question

我正在尝试创建一个 OTP 页面，每个数字的底部都有虚线。我为每个数字使用了一个文本字段，总共使用了 6 个文本字段的 6 个数字。我希望在用户输入整数之前更改下一行的颜色。

线条会改变颜色等，具体取决于哪个是活动文本字段。请注意，活动文本字段不应具有不同的颜色。只有下一个文本字段应该。所以如果我输入第一个数字，第二个数字应该已经是绿色了。

然后当我在第二个文本字段中输入数字时，第三个应该是绿色的。

见截图。

我只使用 Xcode 12.3，无法使用 FocusState API 和 Xcode Beta 中使用的其他 API。

import SwiftUI

class ViewModel: ObservableObject {
    
    @Published var otpField = "" {
        didSet {
            guard otpField.count <= 6,
                  otpField.last?.isNumber ?? true else {
                otpField = oldValue
                
                return
            }
        }
    }
    var otp1: String {
        guard otpField.count >= 1 else {
            return ""
        }
        return String(Array(otpField)[0])
    }
    var otp2: String {
        guard otpField.count >= 2 else {
            return ""
        }
        return String(Array(otpField)[1])
    }
    var otp3: String {
        guard otpField.count >= 3 else {
            return ""
        }
        return String(Array(otpField)[2])
    }
    var otp4: String {
        guard otpField.count >= 4 else {
            return ""
        }
        return String(Array(otpField)[3])
    }
    
    var otp5: String {
        guard otpField.count >= 5 else {
            return ""
        }
        return String(Array(otpField)[4])
    }
    
    var otp6: String {
        guard otpField.count >= 6 else {
            return ""
        }
        return String(Array(otpField)[5])
    }
    
    @Published var borderColor: Color = .black
    @Published var isTextFieldDisabled = false
    var successCompletionHandler: (()->())?
}

struct ContentView: View {
    
      @StateObject var viewModel = ViewModel()
      @State var isFocused = false
      
      let textBoxWidth = UIScreen.main.bounds.width / 8
      let textBoxHeight = UIScreen.main.bounds.width / 8
      let spaceBetweenBoxes: CGFloat = 10
      let paddingOfBox: CGFloat = 1
      var textFieldOriginalWidth: CGFloat {
          (textBoxWidth*6)+(spaceBetweenBoxes*3)+((paddingOfBox*2)*3)
      }
      
      var body: some View {
              
              VStack {
                  
                  ZStack {
                      
                      HStack (spacing: spaceBetweenBoxes){
                        
                        otpText(text: viewModel.otp1)
                        otpText(text: viewModel.otp2)
                        otpText(text: viewModel.otp3)
                        otpText(text: viewModel.otp4)
                        otpText(text: viewModel.otp5)
                        otpText(text: viewModel.otp6)
                    
                      }
                      
                      TextField("", text: $viewModel.otpField)
                      .frame(width: isFocused ? 0 : textFieldOriginalWidth, height: textBoxHeight)
                      .disabled(viewModel.isTextFieldDisabled)
                      .textContentType(.oneTimeCode)
                      .foregroundColor(.clear)
                      .accentColor(.clear)
                      .background(Color.clear)
                      .keyboardType(.numberPad)
                  }
          }
      }
      
      private func otpText(text: String) -> some View {
          
          return Text(text)
              .font(.title)
              .frame(width: textBoxWidth, height: textBoxHeight)
              .background(VStack{
                Spacer()
                RoundedRectangle(cornerRadius: 1)
                    .frame(height: 1)
                    .overlay(Capsule().stroke(Color.green))
               })
              .padding(paddingOfBox)
      }
}

Answer 1

我正在研究答案...

这里我更新了代码。

查看：

struct ContentView: View {
    
    @StateObject var viewModel = ViewModel()
    
    let textBoxWidth = UIScreen.main.bounds.width / 8
    let textBoxHeight = UIScreen.main.bounds.width / 8
    let spaceBetweenLines: CGFloat = 10
    let paddingOfBox: CGFloat = 1
    var textFieldOriginalWidth: CGFloat {
        (textBoxWidth*6)+(spaceBetweenLines*3)+((paddingOfBox*2)*3)
    }
    
    var body: some View {
        
        VStack {
            
            ZStack {
                
                HStack (spacing: spaceBetweenLines){
                    otpText(text: viewModel.otp1, isNextTyped: $viewModel.isNextTypedArr[0])
                    otpText(text: viewModel.otp2, isNextTyped: $viewModel.isNextTypedArr[1])
                    otpText(text: viewModel.otp3, isNextTyped: $viewModel.isNextTypedArr[2])
                    otpText(text: viewModel.otp4, isNextTyped: $viewModel.isNextTypedArr[3])
                    otpText(text: viewModel.otp5, isNextTyped: $viewModel.isNextTypedArr[4])
                    otpText(text: viewModel.otp6, isNextTyped: $viewModel.isNextTypedArr[5])
                }
                
                
                TextField("", text: $viewModel.otpField) { isEditing in
                    viewModel.isEditing = isEditing
                }
                .frame(width: viewModel.isEditing ? 0 : textFieldOriginalWidth, height: textBoxHeight)
                .textContentType(.oneTimeCode)
                .foregroundColor(.clear)
                .accentColor(.clear)
                .background(Color.clear)
                .keyboardType(.numberPad)
            }
            
        }
    }
    
    private func otpText(text: String, isNextTyped: Binding<Bool>) -> some View {
        
        return Text(text)
            .font(.title)
            .frame(width: textBoxWidth, height: textBoxHeight)
            .background(VStack{
                Spacer()
                RoundedRectangle(cornerRadius: 1)
                    .frame(height: 0.5)
                    .foregroundColor(isNextTyped.wrappedValue ? .green : .black)
            })
            .padding(paddingOfBox)
    }
}

视图模型：

class ViewModel: ObservableObject {
    
    @Published var otpField = "" {
        didSet {
            isNextTypedArr = Array(repeating: false, count: 6)
            guard otpField.count <= 6,
                  otpField.last?.isNumber ?? true else {
                otpField = oldValue
                return
            }
            if otpField.count < 6 {
                isNextTypedArr[otpField.count] = true
            }
        }
    }
    var otp1: String {
        guard otpField.count >= 1 else {
            return ""
        }
        return String(Array(otpField)[0])
    }
    var otp2: String {
        guard otpField.count >= 2 else {
            return ""
        }
        return String(Array(otpField)[1])
    }
    var otp3: String {
        guard otpField.count >= 3 else {
            return ""
        }
        return String(Array(otpField)[2])
    }
    var otp4: String {
        guard otpField.count >= 4 else {
            return ""
        }
        return String(Array(otpField)[3])
    }
    
    var otp5: String {
        guard otpField.count >= 5 else {
            return ""
        }
        return String(Array(otpField)[4])
    }
    
    var otp6: String {
        guard otpField.count >= 6 else {
            return ""
        }
        return String(Array(otpField)[5])
    }
    
    @Published var isNextTypedArr = Array(repeating: false, count: 6)
    
    @Published var borderColor: Color = .black
    
    @Published var isEditing = false {
        didSet {
            isNextTypedArr = Array(repeating: false, count: 6)
            if isEditing && otpField.count < 6 {
                isNextTypedArr[otpField.count] = true
            }
        }
    }
}

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