坚持复选标记 Swift

Posted 2023-03-11

【中文标题】坚持复选标记 Swift

【英文标题】：Persist checkmark Swift

【发布时间】：2020-01-10 18:44:18

【问题描述】：

我正在开发一个基于健身的应用程序，用户将选择他们的锻炼，然后转到包含所选锻炼锻炼的表格视图。当用户点击单元格时，我希望出现一个复选标记以指示练习已完成。我已经成功了，但现在我想保留复选标记，所以如果用户关闭应用程序，那么当它重新打开并再次选择锻炼时，复选标记仍会显示。

任何帮助将不胜感激。

下面是表格视图VC，

提前谢谢你。

import UIKit

class workoutTableView: UIViewController, UITableViewDataSource, UITableViewDelegate 

    @IBOutlet weak var workoutTableView: UITableView!

    var navTitle: String = ""
    var workout = [String]()
    let tlabel = UILabel()
    var completed: [Bool] = []
    var saveString = String()
    var saveBool = Bool()

    override func viewDidLoad() 
        super.viewDidLoad()

        setWorkout()
        completed = [Bool](repeating: false, count: workout.count)
        workoutTableView.delegate = self
        workoutTableView.dataSource = self
        tlabel.text = navTitle
        tlabel.textAlignment = .center
        tlabel.font = UIFont(name: "Arial Rounded MT Bold", size: 30)
        tlabel.adjustsFontSizeToFitWidth = true
        navigationItem.titleView = tlabel
    

    func setWorkout() 

        if navTitle == "The 600 Workout" 

          workout = The600Workout().workoutArray
        

        if navTitle == "5 Days for Muscle" 

          workout = FiveDaysForMuscle().workoutArray

        

        if navTitle == "Marathon Ready" 

          workout = MarathonReady().workoutArray
        

        if navTitle == "HIIT @ Home" 

          workout = HIITAtHome().workoutArray
        

        if navTitle == "Get Strong" 

          workout = GetStrong().workoutArray
        

        if navTitle == "Body Weight Blast" 

          workout = BodyWeightBlast().workoutArray
        

        if navTitle == "Bands Pump" 

          workout = BandsPump().workoutArray
        

        if navTitle == "Quickie Warm up" 

          workout = QuickieWarmUp().workoutArray
        

        if navTitle == "The Best Circuit Workout" 

          workout = TheBestCircuit().workoutArray
        

        if navTitle == "The Gym HIIT Workout" 

          workout = GymHIIT().workoutArray
        

        if navTitle == "The Ultimate Workout" 

          workout = UltimateWorkout().workoutArray

        


        if navTitle == "Warm up For Weights" 

          workout = WarmUpForWeights().workoutArray
        

        if navTitle == "6 Day Bro Split" 

          workout = SixDayBroSplit().workoutArray
        

        if navTitle == "Explosive Workout" 

         workout = ExplosiveWorkout().workoutArray
        

        if navTitle == "Strength Circuit" 

          workout = StrengthCircuit().workoutArray
        

        if navTitle == "Killer Circuit" 

          workout = KillerCircuit().workoutArray
        

        if navTitle == "Fitness Test" 

          workout = FitnessTest().workoutArray
        

    

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int 
        return workout.count
    

    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) 
        completed[indexPath.row] = !completed[indexPath.row]
        tableView.cellForRow(at: indexPath)?.accessoryType = completed[indexPath.row] ?  .checkmark : .none
        tableView.deselectRow(at: indexPath, animated: false)
    

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell 


        let cell = tableView.dequeueReusableCell(withIdentifier: "prototypeCell", for: indexPath)
        cell.textLabel?.text = workout[indexPath.row]
        cell.accessoryType = completed[indexPath.row] ?  .checkmark : .none
        cell.layer.borderWidth = 5
        cell.layer.cornerRadius = 20
        cell.layer.borderColor = #colorLiteral(red: 0, green: 0.3285208941, blue: 0.5748849511, alpha: 1)
        cell.textLabel?.textColor = UIColor.black
        cell.textLabel?.adjustsFontSizeToFitWidth = true
        cell.textLabel?.font = .boldSystemFont(ofSize: 15)
        return cell
    

【问题讨论】：

请忽略保存字符串并保存布尔值，它们是我失败尝试的一部分:(

实际上，您必须为每种类型分别保存所选锻炼的数组。这不适用于将所选行保留在一个数组中的方式。我建议将整个锻炼数据保存在像 Core Data 这样的数据库中。再一次，一堆连续的if 表达式（没有else）效率极低。请注意，即使 navTitle 是 "The 600 Workout"，也会对所有类型进行不必要的检查

谢谢，我修改了 if/else if 语句。关于持久性，当您说将它们保存到数据库中时，您是指整个模型还是只是类型？再次感谢

我的意思是整个模型

【参考方案1】：

我要做的是创建某种锻炼列表，其中包含某种值（稍后可能是 IndexPath 的索引）。然后将 NSArray 或 NSDictionary 存储在 UserDefaults 中

【参考方案2】：

我会考虑添加一个结构来更好地组织您的锻炼。我没有为您测试或完全重写代码，但希望这对您有所帮助：

import Foundation

class workoutTableView: UIViewController, UITableViewDataSource, UITableViewDelegate 

    struct Workout 
        let id: Int
        let name: String
        let workouts: [String]
    

    let defaults = UserDefaults.standard
    var workouts: [Workout] = []
    var completed: [Int] = []
    let workoutsKey = "CompletedWorkoutIds"

    override func viewDidLoad() 
        super.viewDidLoad()

        self.completed = defaults.object(forKey: workoutsKey) as? [Int] ?? [Int]()
    

    ...

    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) 
        let workout = self.workouts[indexPath.row]
        if let index = completed.index(of: workout.id) 
            self.completed.remove(at: index)
         else 
            self.completed.append(workout.id)
        
         defaults.set(self.completed, forKey: workoutsKey)

        // Update checkmark
    

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell 
        let workout = self.workouts[indexPath.row]
        if completed.contains(workout.id) 
            // Show checkmark