ios - 没有 Storyboard的自定义 UITableViewCell 不显示

Question

更新答案

我可以使用单元格的 textlabel 属性，我可以为我的自定义标签设置属性并打印值(切换后打印)，但我无法显示任何自定义内容，不是背景颜色，不是值(value)，而不是任何东西。

请注意，我根本不为此使用 Storyboard，并且这两个类在同一个文件中(尝试使用两个单独的文件，没有改变任何东西，所以它与我的问题无关)。

如果有人知道这里的问题是什么并能指出正确的方向，那就太好了。

class DayPickerTableViewController: UITableViewController {

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()
    self.tableView.registerClass(DayPickerTableViewCell.self, forCellReuseIdentifier: "cell")
    self.tableView.scrollEnabled = false
    self.tableView.bounces = false
    self.tableView.rowHeight = UITableViewAutomaticDimension
    self.tableView.estimatedRowHeight = 44
}

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

// MARK: - Table view data source

override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
    // #warning Incomplete implementation, return the number of sections
    return 1
}

override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    // #warning Incomplete implementation, return the number of rows
    return 8
}


override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as! DayPickerTableViewCell
    cell.textLabel!.text = "test"
    switch indexPath.row {

    case 0:
        cell.dayModeLabel.text = "DAY"
        break
    case 1:
        cell.dayModeLabel.text = "WEEK"
        break
    case 2:
        cell.dayModeLabel.text = "WORK WEEK"

        break
    case 3:
        cell.dayModeLabel.text = "WEEK-END"

        break
    case 4:
        cell.dayModeLabel.text = "MONTH"

        break
    case 5:
        cell.dayModeLabel.text = "YEAR"

        break
    case 6:
        cell.dayModeLabel.text = "ALL HISTORY"

        break
    case 7:
        cell.dayModeLabel.text = "CUSTOM"

        break
    default: break
    }
    print(cell.dayModeLabel.text)
    return cell
}

}

class DayPickerTableViewCell: UITableViewCell {

var imgDayPicker = UIImageView()
var dayModeLabel = UILabel()
var dayDisplayLabel = UILabel()

override func awakeFromNib() {
    super.awakeFromNib()
    // Initialization code

    imgDayPicker.translatesAutoresizingMaskIntoConstraints = false
    dayModeLabel.translatesAutoresizingMaskIntoConstraints = false
    dayDisplayLabel.translatesAutoresizingMaskIntoConstraints = false

    imgDayPicker.backgroundColor = UIColor.redColor()
    dayModeLabel.backgroundColor = UIColor.blackColor()
    dayDisplayLabel.backgroundColor = UIColor.greenColor()
    self.contentView.addSubview(imgDayPicker)
    self.contentView.addSubview(dayModeLabel)
    self.contentView.addSubview(dayDisplayLabel)

    let viewsDict = [
        "image" : imgDayPicker,
        "mode" : dayModeLabel,
        "day" : dayDisplayLabel,
    ]

    contentView.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|[image(50)][mode(==day)]|", options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: viewsDict))
}

override func setSelected(selected: Bool, animated: Bool) {
    super.setSelected(selected, animated: animated)

    // Configure the view for the selected state
}

}

为了让代码工作，用这个替换 awake from nib 方法:

override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
    super.init(style: style, reuseIdentifier: reuseIdentifier)
    imgDayPicker.translatesAutoresizingMaskIntoConstraints = false
    dayModeLabel.translatesAutoresizingMaskIntoConstraints = false
    dayDisplayLabel.translatesAutoresizingMaskIntoConstraints = false

    imgDayPicker.backgroundColor = UIColor.redColor()
    dayModeLabel.backgroundColor = UIColor.blackColor()
    dayDisplayLabel.backgroundColor = UIColor.greenColor()
    self.contentView.addSubview(imgDayPicker)
    self.contentView.addSubview(dayModeLabel)
    self.contentView.addSubview(dayDisplayLabel)

    let viewsDict = [
        "image" : imgDayPicker,
        "mode" : dayModeLabel,
        "day" : dayDisplayLabel,
    ]

    contentView.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|[image(50)][mode(==day)]|", options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: viewsDict))
}

required init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
}

Answer 1

Storyboard/xib 加载器发送 awakeFromNib。由于您没有使用 Storyboard 或 xib，因此不会向单元格发送 awakeFromNib，因此代码永远不会运行。

您可以只调用 cell.awakeFromNib()，尽管这会产生误导。我会将代码移动到 init 中。

您还需要对 subview 进行更多约束。