SwiftUI - 文本字段返回键事件

问题描述

首先，我很抱歉我的英语不完美。

我想根据通过文本字段中的返回键接收到的值的条件显示不同的图像。我搜索并尝试了几种方法，但找不到正确的方法。我在 SwiftUI 中找不到合适的返回键事件，所以我尝试了 onReceive。

快速文件。

Get-ChildItem -File -Exclude "*Confidential*" -Recurse | 
  Rename-Item -NewName { $_.BaseName + " - Confidential" + $_.Extension }

json.file

struct QuestionItemView: View {

    @State private var question: Question?
    @State private var answer = ""

    var body: some View {
        vstack(spacing: 30) {
            GroupBox {
                if let question = question {
                    Text(question.question)
                        .font(.largeTitle)
                        .fontWeight(.heavy)
                        .scaledToFit()
                        .frame(width: 300,height: 100)
                        .cornerRadius(12)
                }
            }
        
            GroupBox {
                TextField("Enter your answer",text: $answer)
                    .frame(width: 300)
                    .font(.title2)
                    .scaledToFit()
                    .cornerRadius(12)
                    .multilineTextAlignment(.center)
           }
         
            onReceive(answer.publisher) { _ in
                if answer == question?.answer {
//                        Image(systemName: "circle")
                    print("o")
                } else {
//                        Image(systemName: "multiply")
                    print("x")
                }
            }
        } //: vstack
        .frame(width: 240)
        .background(RoundedRectangle(cornerRadius: 7.0).fill(Color.white))
        .onAppear {
            let questions: [Question] = Bundle.main.decode("questions.json")
            question = questions.randomElement()
        }
    }
}

解决方法

你可以试试这样的：

To move/delete the file once the processing is completed

如果您使用的是旧系统，则可能需要这样做：

struct QuestionItemView: View {
    
    @State private var question: Question?
    @State private var answer = ""
    @State private var imgType = ""
    
    var body: some View {
        VStack(spacing: 30) {
            GroupBox {
                if let question = question {
                    Text(question.question)
                        .font(.largeTitle)
                        .fontWeight(.heavy)
                        .scaledToFit()
                        .frame(width: 300,height: 100)
                        .cornerRadius(12)
                }
            }
            
            GroupBox {
                TextField("Enter your answer",text: $answer)
                    .frame(width: 300)
                    .font(.title2)
                    .scaledToFit()
                    .cornerRadius(12)
                    .multilineTextAlignment(.center)
                    .onSubmit {  // <--- only on pressing the return key
                //  .onChange(of: answer) { _ in  // <-- as you type
                //  .onReceive(answer.publisher) { _ in  // <-- as you type
                    if answer == question?.answer {
                        imgType = "circle"
                        print("o")
                    } else {
                        imgType = "multiply"
                        print("x")
                    }
                }
            }
            
            if imgType == "circle" {
                Image(systemName: "circle")
            } else {
                Image(systemName: "multiply")
            }

        }
        .frame(width: 240)
        .background(RoundedRectangle(cornerRadius: 7.0).fill(Color.white))
        .onAppear {
            let questions: [Question] = Bundle.main.decode("questions.json")
            question = questions.randomElement()
        }
    }
}