无法使用 SwiftUI 在列表中显示整个字符串

Posted 2023-02-24

【中文标题】无法使用 SwiftUI 在列表中显示整个字符串

【英文标题】：Can't show the whole string in a list using SwiftUI

【发布时间】：2021-07-12 07:17:25

【问题描述】：

当你打开sample project:

先按一行，会出现一个加号按钮。点击一次加号按钮后，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）。我没想到会这样，我希望行高会自动增加，因此可以显示整个字符串。我该怎么做才能解决它？

如果我点击加号按钮 5-6 次，行高将按预期自动增加。

主要项目代码在sample project:

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)
        
    

【参考方案1】：

添加.fixedSize(horizontal: false, vertical: true)，它将不再截断文本：

  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，您不会注意到闪烁：

Text(scoreWithRound)

到

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

【讨论】：

它有效，但并没有完美地解决问题。行的高度将是意外的（小于正常高度）See this example。点击加号按钮几次后the height becomes normal again

更新了答案，现在检查它是否适合你。