按下按钮时从 JSON 文件生成随机文本 - SwiftUI

Question

我想从按钮调用的 json 文件创建随机文本生成器。 此时我有随机文本生成器，但要刷新我需要返回另一个视图并打开相同的视图。

我怎样才能让它通过按钮刷新？ 我曾尝试通过函数创建它，但每次我遇到很多错误......

ContentView 代码（允许我运行此代码的 hacking swift 代码除外）

struct Quote: Codable {
        
        var text: String
        var author: String
        
        var shareMessage: String {
            return "\"\(text)\" - \(author)"
        }
    }
        
        struct PytaniaNormalne : View {
            @State private var quote : Quote?
            var body: some View {
                VStack {
                    if let quote = quote {
                        VStack {
                            VStack {
                                Text(quote.text)
                                    .font(.system(.title3))
                                    .foregroundColor(.white)
                                Text(quote.author)
                                    .font(.system(.title3))
                                    .foregroundColor(.white)
                            }
                        }.frame(width: 240)
                            .background(RoundedRectangle(cornerRadius: 7.0).fill(Color.blue))
                    }
                }.onAppear {
                    let quotes = Bundle.main.decode([Quote].self, from: "quotes.json")
                    quote = quotes.randomElement()
                    
                }
            }
        }

文件

[
    {
        "text": "Pytanie 1",
        "author": "tekst"
    },
    {
        "text": "Pytanie 2",
        "author": "tekst"
    },
    {
        "text": "Pytanie 3",
        "author": "teskt"
    },
    {
        "text": "Pytanie 4",
        "author": "tekst"
    },
    {
        "text": "Pytanie 5",
        "author": "author"
    },
    {
        "text": "Pytanie 6",
        "author": "author"
    },
    {
        "text": "Pytanie 7",
        "author": "author"
    }
]

Answer 1

如您所见，我在authorText 下方添加了按钮。每次点击它，setRandomQuote 将被调用，为您的@State 变量设置一个随机引用，随后将重新加载视图。

struct PytaniaNormalne : View {
    @State private var quote : Quote?
    var body: some View {
        VStack {
            if let quote = quote {
                VStack {
                    VStack {
                        Text(quote.text)
                            .font(.system(.title3))
                            .foregroundColor(.white)
                        Text(quote.author)
                            .font(.system(.title3))
                            .foregroundColor(.white)
                        
                        Button(action: setRandomQuote) {
                            Text("Refresh")
                                .font(.system(.title3))
                                .foregroundColor(.white)
                                .padding()
                                .background {
                                    RoundedRectangle(cornerRadius: 8)
                                        .foregroundColor(.blue)
                                }
                        }

                    }
                }.frame(width: 240)
                    .background(RoundedRectangle(cornerRadius: 7.0).fill(Color.blue))
            } else {
                Text("click the button")
                   .font(.system(.title3))
                   .foregroundColor(.white)
            }
        }
    }
    
    private func setRandomQuote() {
        let quotes = Bundle.main.decode([Quote].self, from: "quotes.json")
        quote = quotes.randomElement()
    }
}