Swift UISearchBar通过数组进行的查询不起作用：(

我正在尝试使用核心数据构建一个待办事项列表，以持久化来自类别视图控制器项数组和相应类别项数组的数据。我在实体之间建立了一种关系，因此当从根控制器选择一个类别时，将执行一个到相应项目列表的序列。一切正常来自items controller的筛选器未按预期工作，当在搜索栏中键入所需的项目以进行搜索时，它只返回第一个项目，无论要筛选哪个词。我不知道问题可能在哪里，如果有人能帮我一把，我将非常感谢

我已经尝试过以我所知的任何方式修改委托方法，所以我的想法太多了

**ToDoListVC

导入UIKit 导入CoreData

类ToDoListViewController:UITableViewController{

var toDoItemArray = [ToDoItem]()
var selectedCategory : Category? {
    didSet{
        loadItems()
    }
}

@IBOutlet weak var searchBar: UISearchBar!

let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext

override func viewDidLoad() {
    super.viewDidLoad()

    print (FileManager.default.urls(for: .documentDirectory, in: .userDomainMask))

    searchBar.delegate = self

    let tapGesture = UITapGestureRecognizer(target: self, action: #selector (tableViewTapped))
    tableView.addGestureRecognizer(tapGesture)

    // Do any additional setup after loading the view, typically from a nib.

    tableView.register(UINib(nibName: "CustomToDoItemCell", bundle: nil), forCellReuseIdentifier: "CustomToDoItemCell")

}


//MARK - TableView DataSource Methods

override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return toDoItemArray.count
}


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

    let cell = tableView.dequeueReusableCell(withIdentifier: "CustomToDoItemCell", for: indexPath) as! CustomToDoItemCell

    let item = toDoItemArray[indexPath.row]

    cell.toDoBodyText?.text = item.itemText

    cell.toDoBodyText = UILabel(frame: CGRect(x: 16, y: 11, width: 160, height: 21))

    cell.accessoryType = item.doneStatus == true ? .checkmark : .none

    return cell

}

//MARK: - TableView Delegate Methods

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    print(toDoItemArray[indexPath.row])

    //context.delete(toDoItemArray[indexPath.row])
    //toDoItemArray.remove(at: indexPath.row)

    toDoItemArray[indexPath.row].doneStatus = !toDoItemArray[indexPath.row].doneStatus

    self.saveItems()

    tableView.deselectRow(at: indexPath, animated: true)
}

//MARK: - Add New Items


@IBAction func addNewToDo(_ sender: UIBarButtonItem) {

    var textField = UITextField()

    let alert = UIAlertController(title: "Add A New Check-o Item", message: "", preferredStyle: .alert)

    let addNewAction = UIAlertAction(title: "Add New To Do", style: .default) { (addNewAction) in

        let newItem = ToDoItem(context: self.context)

        newItem.itemText = textField.text!

        newItem.doneStatus = false

        newItem.parentCategory = self.selectedCategory

        self.toDoItemArray.append(newItem)

        self.saveItems()

    }

    let cancelAction = UIAlertAction(title: "Cancel", style: .cancel) { (cancelAction) in

        self.dismiss(animated: true, completion: nil)
        self.tableView.reloadData()

    }

    alert.addTextField { (alertTextField) in

        alertTextField.placeholder = "Start Typing Your New To Do"
        textField = alertTextField //Extending the scope of the alert Text Field

    }

    alert.addAction(cancelAction)

    alert.addAction(addNewAction)

    present(alert, animated: true, completion: nil)

}


//MARK: - Creating & Reading Core Data


func saveItems () {

    do {

        try context.save()

    } catch {

        print ("Error saving context \(error)")

    }

    tableView.reloadData() //This method reloads data so the new item from the text field alert is added to the To Do Item Array
}

func loadItems (with  request : NSFetchRequest<ToDoItem> = ToDoItem.fetchRequest(), predicate : NSPredicate? = nil) {

    let categoryPredicate = NSPredicate(format: "parentCategory.categoryName MATCHES %@", selectedCategory!.categoryName!)

    if let additionalPredicate = predicate {
            request.predicate = NSCompoundPredicate(andPredicateWithSubpredicates: [categoryPredicate, additionalPredicate])
    } else {
            request.predicate = categoryPredicate
    }

    do {
            toDoItemArray = try context.fetch(request)
    } catch {
            print ("Error Fetching Data From Context \(error)")
    }

        tableView.reloadData()
    }

var categoryArray = [Category]()

let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext

override func viewDidLoad() {
    super.viewDidLoad()

     print (FileManager.default.urls(for: .documentDirectory, in: .userDomainMask))

    loadItems()

    tableView.register(UINib(nibName: "CustomToDoItemCell", bundle: nil), forCellReuseIdentifier: "CustomToDoItemCell")


}

//MARK: - TableView DataSource Methods

override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

    return categoryArray.count

}

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

    let cell = tableView.dequeueReusableCell(withIdentifier: "CustomToDoItemCell", for: indexPath) as! CustomToDoItemCell
    let item = categoryArray[indexPath.row]

    cell.toDoBodyText?.text = item.categoryName
    cell.toDoBodyText = UILabel(frame: CGRect(x: 16, y: 11, width: 160, height: 21))

    return cell

}


//MARK: - Data Source Delegate Methods

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    performSegue(withIdentifier: "goToItems", sender: self)
}

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

    let destinationVC = segue.destination as! ToDoListViewController
    if let indexPath = tableView.indexPathForSelectedRow {

        destinationVC.selectedCategory = categoryArray[indexPath.row]

    }

}


//MARK: - Add New Categories

@IBAction func addNewCategory(_ sender: UIBarButtonItem) {
    var textField = UITextField()
    let alert = UIAlertController(title: "Add New Check-o Category", message: "", preferredStyle: .alert)
    let addNewCategory = UIAlertAction(title: "Add New Category", style: .default) { (addNewCategory) in

        let newItem = Category(context: self.context)
        newItem.categoryName = textField.text!
        self.categoryArray.append(newItem)
        self.saveItems()
    }

    let cancelAction = UIAlertAction(title: "Cancel", style: .cancel) { (cancelAction) in

        self.dismiss(animated: true, completion: nil)
        self.tableView.reloadData()

    }

    alert.addTextField { (alertTextField) in

        alertTextField.placeholder = "Start Typing Your New Category"
        textField = alertTextField

    }

    alert.addAction(addNewCategory)
    alert.addAction(cancelAction)

    present(alert, animated: true, completion: nil)

}

//MARK: - TableView Manipulation Methods

func saveItems () {

    do {

        try context.save()

    } catch {

        print ("Error saving context \(error)")

    }

    tableView.reloadData() //This method reloads data so the new item from the text field alert is added to the To Do Item Array
}

func loadItems (with  request : NSFetchRequest<Category> = Category.fetchRequest()) {

    do {
        categoryArray = try context.fetch(request)
    } catch {
        print ("Error Fetching Data From Context \(error)")
    }

    tableView.reloadData()
}

}

**类别视图控制器

导入UIKit 导入CoreData

类类别ViewController:UITableViewController{

var toDoItemArray = [ToDoItem]()
var selectedCategory : Category? {
    didSet{
        loadItems()
    }
}

@IBOutlet weak var searchBar: UISearchBar!

let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext

override func viewDidLoad() {
    super.viewDidLoad()

    print (FileManager.default.urls(for: .documentDirectory, in: .userDomainMask))

    searchBar.delegate = self

    let tapGesture = UITapGestureRecognizer(target: self, action: #selector (tableViewTapped))
    tableView.addGestureRecognizer(tapGesture)

    // Do any additional setup after loading the view, typically from a nib.

    tableView.register(UINib(nibName: "CustomToDoItemCell", bundle: nil), forCellReuseIdentifier: "CustomToDoItemCell")

}


//MARK - TableView DataSource Methods

override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return toDoItemArray.count
}


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

    let cell = tableView.dequeueReusableCell(withIdentifier: "CustomToDoItemCell", for: indexPath) as! CustomToDoItemCell

    let item = toDoItemArray[indexPath.row]

    cell.toDoBodyText?.text = item.itemText

    cell.toDoBodyText = UILabel(frame: CGRect(x: 16, y: 11, width: 160, height: 21))

    cell.accessoryType = item.doneStatus == true ? .checkmark : .none

    return cell

}

//MARK: - TableView Delegate Methods

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    print(toDoItemArray[indexPath.row])

    //context.delete(toDoItemArray[indexPath.row])
    //toDoItemArray.remove(at: indexPath.row)

    toDoItemArray[indexPath.row].doneStatus = !toDoItemArray[indexPath.row].doneStatus

    self.saveItems()

    tableView.deselectRow(at: indexPath, animated: true)
}

//MARK: - Add New Items


@IBAction func addNewToDo(_ sender: UIBarButtonItem) {

    var textField = UITextField()

    let alert = UIAlertController(title: "Add A New Check-o Item", message: "", preferredStyle: .alert)

    let addNewAction = UIAlertAction(title: "Add New To Do", style: .default) { (addNewAction) in

        let newItem = ToDoItem(context: self.context)

        newItem.itemText = textField.text!

        newItem.doneStatus = false

        newItem.parentCategory = self.selectedCategory

        self.toDoItemArray.append(newItem)

        self.saveItems()

    }

    let cancelAction = UIAlertAction(title: "Cancel", style: .cancel) { (cancelAction) in

        self.dismiss(animated: true, completion: nil)
        self.tableView.reloadData()

    }

    alert.addTextField { (alertTextField) in

        alertTextField.placeholder = "Start Typing Your New To Do"
        textField = alertTextField //Extending the scope of the alert Text Field

    }

    alert.addAction(cancelAction)

    alert.addAction(addNewAction)

    present(alert, animated: true, completion: nil)

}


//MARK: - Creating & Reading Core Data


func saveItems () {

    do {

        try context.save()

    } catch {

        print ("Error saving context \(error)")

    }

    tableView.reloadData() //This method reloads data so the new item from the text field alert is added to the To Do Item Array
}

func loadItems (with  request : NSFetchRequest<ToDoItem> = ToDoItem.fetchRequest(), predicate : NSPredicate? = nil) {

    let categoryPredicate = NSPredicate(format: "parentCategory.categoryName MATCHES %@", selectedCategory!.categoryName!)

    if let additionalPredicate = predicate {
            request.predicate = NSCompoundPredicate(andPredicateWithSubpredicates: [categoryPredicate, additionalPredicate])
    } else {
            request.predicate = categoryPredicate
    }

    do {
            toDoItemArray = try context.fetch(request)
    } catch {
            print ("Error Fetching Data From Context \(error)")
    }

        tableView.reloadData()
    }

var categoryArray = [Category]()

let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext

override func viewDidLoad() {
    super.viewDidLoad()

     print (FileManager.default.urls(for: .documentDirectory, in: .userDomainMask))

    loadItems()

    tableView.register(UINib(nibName: "CustomToDoItemCell", bundle: nil), forCellReuseIdentifier: "CustomToDoItemCell")


}

//MARK: - TableView DataSource Methods

override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

    return categoryArray.count

}

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

    let cell = tableView.dequeueReusableCell(withIdentifier: "CustomToDoItemCell", for: indexPath) as! CustomToDoItemCell
    let item = categoryArray[indexPath.row]

    cell.toDoBodyText?.text = item.categoryName
    cell.toDoBodyText = UILabel(frame: CGRect(x: 16, y: 11, width: 160, height: 21))

    return cell

}


//MARK: - Data Source Delegate Methods

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    performSegue(withIdentifier: "goToItems", sender: self)
}

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

    let destinationVC = segue.destination as! ToDoListViewController
    if let indexPath = tableView.indexPathForSelectedRow {

        destinationVC.selectedCategory = categoryArray[indexPath.row]

    }

}


//MARK: - Add New Categories

@IBAction func addNewCategory(_ sender: UIBarButtonItem) {
    var textField = UITextField()
    let alert = UIAlertController(title: "Add New Check-o Category", message: "", preferredStyle: .alert)
    let addNewCategory = UIAlertAction(title: "Add New Category", style: .default) { (addNewCategory) in

        let newItem = Category(context: self.context)
        newItem.categoryName = textField.text!
        self.categoryArray.append(newItem)
        self.saveItems()
    }

    let cancelAction = UIAlertAction(title: "Cancel", style: .cancel) { (cancelAction) in

        self.dismiss(animated: true, completion: nil)
        self.tableView.reloadData()

    }

    alert.addTextField { (alertTextField) in

        alertTextField.placeholder = "Start Typing Your New Category"
        textField = alertTextField

    }

    alert.addAction(addNewCategory)
    alert.addAction(cancelAction)

    present(alert, animated: true, completion: nil)

}

//MARK: - TableView Manipulation Methods

func saveItems () {

    do {

        try context.save()

    } catch {

        print ("Error saving context \(error)")

    }

    tableView.reloadData() //This method reloads data so the new item from the text field alert is added to the To Do Item Array
}

func loadItems (with  request : NSFetchRequest<Category> = Category.fetchRequest()) {

    do {
        categoryArray = try context.fetch(request)
    } catch {
        print ("Error Fetching Data From Context \(error)")
    }

    tableView.reloadData()
}

var categoryArray=[Category]（）
让上下文=（UIApplication.shared.delegate为！AppDelegate）。persistentContainer.viewContext
重写func viewDidLoad（）{
super.viewDidLoad（）
打印（FileManager.default.url（用于：.documentDirectory，位于：.userDomainMask中））
loadItems（）
tableView.register（UINib（nibName:“CustomToDoItemCell”，bundle:nil），强制重用标识符：“CustomToDoItemCell”）
}
//MARK:-TableView数据源方法
重写func tableView（tableView:UITableView，numberofrowsinssection:Int）->Int{
返回categoryArray.count
}
重写func tableView（tableView:UITableView，cellForRowAt indexath:indexPath）->UITableViewCell{
让cell=tableView.dequeueReusableCell（标识符为：“CustomToDoItemCell”，for:indexPath）作为！CustomToDoItemCell
让item=categoryArray[indexPath.row]
cell.toDoBodyText？.text=item.categoryName
cell.toDoBodyText=UILabel（帧：CGRect（x:16，y:11，宽度：160，高度：21））
返回单元
}
//标记：-数据源委托方法
重写func tableView（tableView:UITableView，didSelectRowAt indexPath:indexPath）{
性能检查（带有标识符：“goToItems”，发送者：self）
}
覆盖功能准备（对于segue:UIStoryboardSegue，发送方：有吗？）{
让destinationVC=segue.destination为！ToDoListViewController
如果让indexPath=tableView.indexPathForSelectedRow{
destinationVC.selectedCategory=categoryArray[indexPath.row]
}
}
//标记：-添加新类别
@iAction func addNewCategory（uu发件人：UIBarButtonim）{
var textField=UITextField（）
let alert=UIAlertController（标题：“添加新的检查-o类别”，消息：，首选样式：。警报）
让addNewCategory=UIAlertAction（标题：“添加新类别”，样式：。默认值）{（addNewCategory）在
让newItem=Category（上下文：self.context）
newItem.categoryName=textField.text！
self.categoryArray.append（newItem）
self.saveItems（）
}
让cancelAction=UIAlertAction（标题：“Cancel”，样式：.Cancel）{（cancelAction）在
self.disclose（动画：true，完成：nil）
self.tableView.reloadData（）
}
alert.addTextField{（alertTextField）位于
alertTextField.placeholder=“开始键入新类别”
textField=alertTextField
}
alert.addAction（addNewCategory）
alert.addAction（取消操作）
当前（警报、动画：真、完成：无）
}
//MARK:-表视图操作方法
func saveItems（）{
做{
尝试context.save（）
}抓住{
打印（“保存上下文时出错\（错误）”）
}
tableView.reloadData（）//此方法重新加载数据，以便将文本字段警报中的新项添加到待办事项数组中
}
func loadItems（请求为：NSFetchRequest=Category.fetchRequest（））{
做{
categoryArray=try context.fetch（请求）
}抓住{
打印（“从上下文提取数据时出错\（错误）”）
}
tableView.reloadData（）
}

}

希望能够从“待办事项”控制器中筛选搜索栏中键入的任何单词，并实际显示查询结果。

有关类似问题和答案，请参阅。有关类似问题和答案，请参阅