如何在自定义 tableViewCell 中初始化 UiPickerView？

Question

我正在尝试在tableViewCell 中创建PickerView。我使我的自定义单元符合UIPickerViewDelegate 和UIPickerViewDataSource 协议。我将数据数组从控制器发送到单元格（我认为这不符合 MVC 模式，也许你也可以建议我如何解决这个问题？）。但是当tableview 调用dequeueReusableCellWithIdentifier 时，单元格调用pickerView 函数。但是，pickerView 函数使用了尚未初始化的 pickerData。我该如何解决？

下面是我的单元格代码：

class PickerTableViewCell: UITableViewCell, UIPickerViewDelegate, UIPickerViewDataSource {

    @IBOutlet weak var picker: UIPickerView!
    @IBOutlet weak var title: UILabel!
    var pickerData: Array<String>!
    override func awakeFromNib() {
        self.picker.delegate = self;
        self.picker.dataSource = self;
        super.awakeFromNib()

    }

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

        // Configure the view for the selected state
    }

    func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return pickerData.count // I get fatal error here due to pickerData is nil
    }

    func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
        return 1
    }

    func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        return pickerData[row]
    }


}

这里是单元初始化的代码：

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCellWithIdentifier("picker", forIndexPath: indexPath) as! PickerTableViewCell
    cell.title.text = fieldModel.editFieldArray[indexPath.row].title
    cell.pickerData = (fieldModel.editFieldArray[indexPath.row] as! PickerEditField).pickerData
    return cell
}

非常感谢您的帮助！

Answer 1

您的问题是您已经重新加载了PickerView 的组件，所以在您的cellForRowAtIndexPath 中做一个小改动，然后在设置pickerData 数组后重新加载PickerView 的组件。

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCellWithIdentifier("picker", forIndexPath: indexPath) as! PickerTableViewCell
    cell.title.text = fieldModel.editFieldArray[indexPath.row].title
    cell.pickerData = (fieldModel.editFieldArray[indexPath.row] as! PickerEditField).pickerData
    cell.picker.reloadAllComponents();
    return cell
}

同样在awakeFromNib中初始化你的pickerData对象

override func awakeFromNib() {
    self.pickerData = Array<String>()
    self.picker.delegate = self;
    self.picker.dataSource = self;
    super.awakeFromNib()

}