假设我有一群狗private var dogs: Observable<[Dogs]>。每次生成一个新值时，都会调用我的块，在其中为我创建一个新的数据源和委托UIPickerView，然后在我调用的块中，pickerView.reloadAllComponents()但我的视图显示为一个空的pickerView，即使查询了数据源和委托。
示例代码：
self.dataStream
.subscribeNext {
self.dataSource = PickerViewDataSource(data: $0)
self.pickerView.dataSource = self.dataSource
self.delegate = PickerViewDelegate(data: $0, selectedRow: self._selectedRowStream)
self.pickerView.delegate = self.delegate
self.pickerView.reloadAllComponents()
}.addDisposableTo(self.disposeBag)
调试数据源和委托我知道这些是被查询的，我在 UIViewController 中保留数据源和委托引用的原因是因为它们UIPickerView持有这些的弱引用。
这是我尝试过的最后一种策略，但仍然得到相同的结果。任何帮助，将不胜感激。谢谢。
更新：
DogPickerView 数据源：
class DogPickerViewDataSource: NSObject, UIPickerViewDataSource {
private var dogs: [Dog]
init(
dogs: [Dog]
) {
self.dogs = dogs
}
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return dogs.count
}
}
DogPickerViewDelegate：
class DogPickerViewDelegate: NSObject, UIPickerViewDelegate {
private var selectedRow: BehaviorSubject<Int>
private var dogs: [Dog]
init(
dogs: [Dog],
selectedRow: BehaviorSubject<Int>
) {
self.dogs = dogs
self.selectedRow = selectedRow
}
func pickerView(pickerView: UIPickerView, attributedTitleForRow row: Int, forComponent component: Int) -> NSAttributedString? {
let dogName = (self.dogs[row].name)!
return NSAttributedString(string: dogName)
}
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
self.selectedRow.onNext(row)
}
}