无法使用 SwiftUI sample project 中的主要项目代码：

编程问答 2023-01-24

问题描述

当您打开 sample project 时：

先按一行，会出现一个加号按钮。点击加号按钮一次后，将在行中附加一个加号。如果我多次点击按钮，++++ 字符串将显示 +...（如下图所示）。我没想到这一点，我希望行高会自动增加，以便可以显示整个字符串。我该怎么做才能修复它？

enter image description here

如果我点击加号按钮 5-6 次，行高将按预期自动增加。

enter image description here

sample project 中的主要项目代码：

ContentView.swift

struct ContentView: View {
    
    @EnvironmentObject var userData: UserData
    
    var body: some View {

        HStack {
            List {
                ForEach(userData.subtasks) { subtask in
                    SubtaskRowNextToCard(subtaskModel: subtask)
                }
            }
            
            if userData.currentSubtask != nil {
                SubtaskCard()
                    .padding(.all)
            }
        }
        .onAppear {
                        
            for _ in 0..<20 {
                appendASubtask()
            }
            
        }
        
    }
    
    func appendASubtask() {
        let aSubtask = SubtaskModel(
        score: ""
        )
        
        userData.subtasks.append(aSubtask)
    }
    
}

SubtaskModel.swift

import Foundation
import SwiftUI

class SubtaskModel: ObservableObject,Identifiable {
    @Published var score: String = ""
    
    init(
        score: String
    ) {
        self.score = score
    }
}

SubtaskRowNextToCard.swift

struct SubtaskRowNextToCard: View {
    
    @Observedobject var subtaskModel: SubtaskModel
    @EnvironmentObject var userData: UserData
    
    @State var scoreWithRound: String = ""
    
    var body: some View {
        
        Button(action: {
            userData.currentSubtask = subtaskModel
        }) {
            Text(scoreWithRound)
        }
        .onAppear {
            updatescore()
        }
        .onReceive(NotificationCenter.default.publisher(for: NSNotification.Name.init("changedCurrentSubtask"))) { obj in
            updatescore()
        }
        
    }
    
    func updatescore() {
        scoreWithRound = subtaskModel.score
    }
    
}

SubtaskCard.swift

struct SubtaskCard: View {
    
    @EnvironmentObject var userData: UserData
        
    var body: some View {
        
        Button(action: {
            print("+ button was tapped")
            appendscore(newscore: "+")
        }) {
            Image(systemName: "plus.circle.fill")
        }
        .buttonStyle(PlainButtonStyle())
        
    }
    
    func appendscore(newscore: String) {
        if let subtaskModel = userData.currentSubtask {
            subtaskModel.score = subtaskModel.score + newscore + " "
                        
            NotificationCenter.default.post(name: NSNotification.Name.init("changedCurrentSubtask"),object: nil,userInfo: nil)
        }
    }
}

解决方法

添加 .fixedSize(horizontal: false,vertical: true)，它不会再截断文本：

  ForEach(userData.subtasks) { subtask in
                    SubtaskRowNextToCard(subtaskModel: subtask).fixedSize(horizontal: false,vertical: true)
                }

编辑： 对于动态高度修复：

将 Text 替换为 TextEditor，您将不会注意到闪烁：

Text(scoreWithRound)

到

TextEditor(text: $scoreWithRound).allowsHitTesting(false)
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