我试图以编程方式创建UIPickerView并将其显示为文本字段的firstResponder,但是,选择器视图未显示. textField连接到接口构建器中的对象,但是正在以编程方式创建pickerView.
class View: UIViewController {
@IBOutlet var picker : UIPickerView = UIPickerView.alloc()
@IBOutlet var textField : UITextField = nil
override func viewDidLoad() {
super.viewDidLoad()
picker = UIPickerView()
picker.delegate = self
picker.dataSource = self
picker.backgroundColor = UIColor.blackColor()
textField.inputView = picker
}
}
extension View: UIPickerViewDataSource {
func numberOfComponentsInPickerView(colorPicker: UIPickerView!) -> Int {
return 1
}
func pickerView(pickerView: UIPickerView!,numberOfRowsInComponent component: Int) -> Int {
return 5
}
}
extension View: UIPickerViewDelegate {
func pickerView(pickerView: UIPickerView!,titleForRow row: Int,forComponent component: Int) -> String!
{
return "Text"
}
}
为什么我在运行应用程序时看不到这个pickerView？
