swift UIPickView

/* swift 3.0    UIPickView的使用

        

*/

        

        let pickView = UIPickerView()

        pickView.dataSource = self

        pickView.delegate = self

        pickView.showsSelectionIndicator = true

        

        /* 设置pickerView默认选中 

         

            Component表示列, 下标从0开始

            row表示行, 下标从0开始

            

         

         */

        pickView.selectRow(0, inComponent: 0, animated: true)

        pickView.selectRow(0, inComponent: 1, animated: true)

        pickView.selectRow(0, inComponent: 2, animated: true)

        

        view.addSubview(pickView)

        

        

        /* 获取默认的选中信息 */

        print(pickView.selectedRow(inComponent: 0))

        print(pickView.selectedRow(inComponent: 1))

        print(pickView.selectedRow(inComponent: 2))

        

        

        

    }

    

}

extension UIViewController :UIPickerViewDataSource,UIPickerViewDelegate {

    /* 设置选择框的列数为3 */

    public func numberOfComponents(in pickerView: UIPickerView) -> Int{

        

        return 3;

    }

    

    /* 设置行数为9 */

    public func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int{

    

        return 9;

    }

/* 使用系统的view时， 返回要显示的文字 */

    public func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {

    

        return String(row)+"-"+String(component)

    }

    

    

/* 自定义view */

//    public func pickerView(_ pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusing view: UIView?) -> UIView {

//        

//        

//        let view = UILabel()

//        view.backgroundColor = UIColor.orange

//        view.text = "12345"

//        

//        return  view

//    }

    

    /* 检查响应选项的选择状态 */

    public func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {

        

        print(pickerView.selectedRow(inComponent: component))

    }

}