Question

我正在创建一个应用程序，用于加载用户可以添加到表格中的书籍和书籍类别列表。我创建了一个结构来组织数据。当用户想要添加新书或类别时，它会显示我的AddBookCategoryViewController。当我尝试添加类别时，它会成功将类别加载为标题标题。但是，当我尝试添加第二个类别时，它不会第二次添加它。它不会带来任何错误，它会通过整个prepareForSegue。我完全不知道如何解决这个问题。

注意：我没有尝试一次添加两个类别，我试图成功添加一个（我可以），然后点击添加按钮尝试添加第二个。

感谢。

以下是ViewController的代码：

    class ViewController: UITableViewController {

        var testArray = [Category]()

        var sections: [Category] = CategoryData().getCategoryFromData()

        @IBAction func editButton(_ sender: UIBarButtonItem) {

            self.isEditing = !self.isEditing
        }

        @IBAction func addButton(_ sender: UIBarButtonItem) {
        }

@IBAction func saveNewData(_ segue: UIStoryboardSegue) {
    if segue.sourceViewController is AddBookCategoryViewController {

        print("saveNewData")
    }
}

override func viewDidLoad() {
    super.viewDidLoad()
}

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
}

override func numberOfSections(in tableView: UITableView) -> Int {
    return testArray.count
}

override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return testArray[section].sectionItems!.count
}

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

        let cell = tableView.dequeueReusableCell(withIdentifier: "bookList", for: indexPath)

        cell.textLabel?.text = testArray[indexPath.section].sectionItems?[indexPath.row]
        cell.detailTextLabel?.text = ""

        return cell

    }

    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        print(sections[indexPath.section].sectionItems?[indexPath.row])
    }

    override func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        return testArray[section].sectionHeading
    }

    override func tableView(_ tableView: UITableView, willDisplayHeaderView view: UIView, forSection section: Int) {
        let header = view as? UITableViewHeaderFooterView
        header?.textLabel?.textColor = UIColor.orange()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}

这是AddBookCategoryViewController：

import UIKit

class AddBookCategoryViewController: UIViewController {

    var data: Category?

    @IBOutlet weak var segmentedControl: UISegmentedControl!

    @IBAction func cancelButton(_ sender: UIBarButtonItem) {
        dismiss(animated: true, completion: nil)
    }

    @IBOutlet weak var nameTextField: UITextField!

    @IBOutlet weak var nameLabel: UILabel!


    @IBOutlet weak var pickCategory: UIButton!

    @IBAction func segmentedChangeFields(_ sender: AnyObject) {

        if segmentedControl.selectedSegmentIndex == 0 {
            nameLabel.text = "Name of Book"
            authorLabel.text = "Author"
            authorLabel.isHidden = false
            authorTextField.isHidden = false
            pickCategory.isHidden = false
        }
        else {
            nameLabel.text = "Name of Category"
            authorLabel.isHidden = true
            authorTextField.isHidden = true
            pickCategory.isHidden = true
            categoryLabel.isHidden = true
        }
    }

    @IBOutlet weak var categoryLabel: UILabel!


    @IBOutlet weak var authorTextField: UITextField!
    @IBOutlet weak var authorLabel: UILabel!

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

        if segue.identifier == "saveNewData" {
            let vc = segue.destinationViewController as! ViewController
            print("1")

            if segmentedControl.selectedSegmentIndex == 0 {
                print("2")

                } else {
                print("3")
                vc.testArray.append(Category(sectionHeading: nameTextField.text!, sectionItems: []))
            }
        }
        print("4")
    }


    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


    /*
    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepare(for segue: UIStoryboardSegue, sender: AnyObject?) {
        // Get the new view controller using segue.destinationViewController.
        // Pass the selected object to the new view controller.
    }
    */

}

Answer 1

作为参考，我设法弄清了问题。我能够将tableView.reloadData()添加到View Controller中的@IBAction func saveNewData，就像这样。

@IBAction func saveNewData(_ segue: UIStoryboardSegue) {
    if segue.sourceViewController is AddBookCategoryViewController {

        print("saveNewData")
        tableView.reloadData()
    }
}

感谢。

struct中的swift数组只会附加一次如何再次附加一个单独的时间？

1 个答案: