如何在UIActionSheet中创建UIPickerView

func actionSheet(actionSheet: UIActionSheet, clickedButtonAtIndex buttonIndex: Int) {
    if buttonIndex == 0 {
        let pickerView = UIPickerView(frame: CGRect(x: 0, y: 0, width: 320, height: 216))
        pickerView.delegate = self
        pickerView.dataSource = self
        actionSheet.addSubview(pickerView)
    }
}

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

func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    return options.count
}

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

func actionSheet(actionSheet: UIActionSheet, clickedButtonAtIndex buttonIndex: Int) {
    if buttonIndex == 0 {
        let pickerView = UIPickerView(frame: CGRect(x: 0, y: 0, width: 320, height: 216))
        pickerView.delegate = self
        pickerView.dataSource = self
        actionSheet.addSubview(pickerView)

        // 添加布局约束
        pickerView.translatesAutoresizingMaskIntoConstraints = false
        actionSheet.addConstraint(NSLayoutConstraint(item: pickerView, attribute: .centerX, relatedBy: .equal, toItem: actionSheet, attribute: .centerX, multiplier: 1, constant: 0))
        actionSheet.addConstraint(NSLayoutConstraint(item: pickerView, attribute: .bottom, relatedBy: .equal, toItem: actionSheet, attribute: .bottom, multiplier: 1, constant: 0))
        actionSheet.addConstraint(NSLayoutConstraint(item: pickerView, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1, constant: 320))
        actionSheet.addConstraint(NSLayoutConstraint(item: pickerView, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1, constant: 216))
    }
}