原型单元格无法正确显示

Question

我的tableView有两个原型单元格，在故事板中编程如下。

标识符都是正确的另一个不是IB和故事板之间的错误，因为标识符链接起来。但是当我构建并运行项目时，我会看到以下屏幕（请注意，在此运行中，semester.subjects和semester.activities为空）。

另外请注意，当我点击我的第一个单元格时，没有任何反应，但是当我点击我的第二​​个单元格时，它会改变为我想要的那个。我的问题是这是怎么发生的？如果需要，下面是我的cellForRowAt indexPath。

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "subjectCell", for: indexPath) as! SubjectTableViewCell
    let addCell = tableView.dequeueReusableCell(withIdentifier: "addCell", for: indexPath) as! AddSubjectTableViewCell
    var cellToAdd = UITableViewCell()
    switch indexPath.section {
    case 0:
        if indexPath.row < semester.subjects.count{
        let subject = semester.subjects[indexPath.row]
            cell.subjectColourView.backgroundColor = subject.colour
            cell.subjectLabel.text = subject.name
            cell.teacherLabel.text = subject.teacher
        cellToAdd = cell
        }
        else if indexPath.row == semester.subjects.count {
            cellToAdd = addCell
        }
    case 1:
        if indexPath.row < semester.activities.count{
        let activity = semester.activities[indexPath.row]
            cell.subjectColourView.backgroundColor = activity.colour
            cell.subjectLabel.text = activity.name
            cell.teacherLabel.text = activity.teacher
        cellToAdd = cell
        }
        else if indexPath.row == semester.activities.count {
            cellToAdd = addCell
        }

    default:
        break
    }
    print(cellToAdd.reuseIdentifier)
    return cellToAdd


}

这是整个TVC

import UIKit

类SubjectTableViewController：UITableViewController {     var semester：学期！

override func viewDidLoad() {
    super.viewDidLoad()

    // Uncomment the following line to preserve selection between presentations
    // self.clearsSelectionOnViewWillAppear = false

    // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
    // self.navigationItem.rightBarButtonItem = self.editButtonItem()

}

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

// MARK: - Table view data source

override func numberOfSections(in tableView: UITableView) -> Int {
    return 2
}

override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    switch section {
    case 0:
        return semester.subjects.count + 1
    case 1:
        return semester.activities.count + 1
    default:
        return 0
    }
}
override func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
    switch section {
    case 0:
        return "Subjects"
    case 1:
        return "Extracurricular Activities"
    default:
        return nil
    }
}


override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "subjectCell", for: indexPath) as! SubjectTableViewCell
    let addCell = tableView.dequeueReusableCell(withIdentifier: "addCell", for: indexPath) as! AddSubjectTableViewCell
    var cellToAdd = UITableViewCell()
    switch indexPath.section {
    case 0:
        if indexPath.row < semester.subjects.count{
        let subject = semester.subjects[indexPath.row]
            cell.subjectColourView.backgroundColor = subject.colour
            cell.subjectLabel.text = subject.name
            cell.teacherLabel.text = subject.teacher
        cellToAdd = cell
        }
        else if indexPath.row == semester.subjects.count {
            cellToAdd = addCell
        }
    case 1:
        if indexPath.row < semester.activities.count{
        let activity = semester.activities[indexPath.row]
            cell.subjectColourView.backgroundColor = activity.colour
            cell.subjectLabel.text = activity.name
            cell.teacherLabel.text = activity.teacher
        cellToAdd = cell
        }
        else if indexPath.row == semester.activities.count {
            cellToAdd = addCell
        }

    default:
        break
    }
    print(cellToAdd.reuseIdentifier)
    return cellToAdd


}
}

Answer 1

问题是，谁知道是什么原因，那个单元在开关外被拒绝了。

 if indexPath.row < semester.subjects.count{
    let cell = tableView.dequeueReusableCell(withIdentifier: "subjectCell", for: indexPath) as! SubjectTableViewCell
    let subject = semester.subjects[indexPath.row]
        cell.subjectColourView.backgroundColor = subject.colour
        cell.subjectLabel.text = subject.name
        cell.teacherLabel.text = subject.teacher
    cellToAdd = cell
    }