出于某种原因,我不能将UIPickerView
的数据源或委托分配给我的NSObject。
我有一个扩展NSObject
和UIPickerViewDataSource
的UIPickerViewDelegate
class STRepeatPicker: NSObject, UIPickerViewDataSource, UIPickerViewDelegate {
let options = ["One", "Two", "Three", "Four", "Five"]
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return self.options.count
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return options[row]
}
}
我有一个UIViewController
尝试设置数据源和委托。它是UIPickerView
内的UITableViewCell
。
我在顶部创建了对象:
let repeatPickerDataSource = STRepeatPicker()
然后在cellForRowAt:
我尝试设置数据源和委托。
let cell = tableView.dequeueReusableCell(withIdentifier: "pickerCell", for: indexPath) as! PickerTableViewCell
cell.picker.delegate? = repeatPickerDataSource
cell.picker.dataSource? = repeatPickerDataSource
return cell
当我运行它崩溃,如果我调试并尝试打印出cell.picker.delegate我收到一个错误:Unexpectedly found nil while unwrapping an Optional value
有谁知道如何将UIPickerViewDelegate和UIPickerViewDataSource分配给这样的NSObject?
问题是我没有正确注册我的单元格,我正在注册它
self.tableView.register(UIPickerViewDelegate.self, forCellReuseIdentifier: "pickerCell")
什么时候应该这样:
self.tableView.register(UINib.init(nibName: "PickerTableViewCell", bundle: nil), forCellReuseIdentifier: "pickerCell")