import UIKit
class ViewController: UIViewController ,UIPickerViewDelegate{
var pickerView:UIPickerView!
override func viewDidLoad() {
super.viewDidLoad()
var SCREEN_WIDTH = self.view.frame.width
var SCREEN_HIGHT = self.view.frame.height
pickerView = UIPickerView()
pickerView.delegate = self;
pickerView.selectRow(1, inComponent: 0, animated: true)
pickerView.selectRow(2, inComponent: 1, animated: true)
pickerView.selectRow(3, inComponent: 2, animated: true)
self.view.addSubview(pickerView);
let button = UIButton(frame: CGRectMake((SCREEN_WIDTH-100)/2,200,100,30))
// button.center = self.view.center
button.backgroundColor = UIColor.blueColor()
button.setTitle("读取", forState: .Normal)
button.addTarget(self, action: "getPickerViewValue", forControlEvents: .TouchUpInside)
self.view.addSubview(button)
}
//------设置选择框的列数为3列,继承于UIPickerViewDataSource协议------
func numberOfComponentsInPickerView( pickerView: UIPickerView) -> Int{
return 3
}
//设置选择框的行数为9行,继承于UIPickerViewDataSource协议
func pickerView(pickerView: UIPickerView,numberOfRowsInComponent component: Int) -> Int{
return 9
}
//设置选择框各选项的内容,继承于UIPickerViewDelegate协议
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int)
-> String? {
return String(row)+"-"+String(component)
}
//触摸按钮时,获得被选中的索引
func getPickerViewValue(){
let alertView = UIAlertView();
alertView.title="被选中的索引为"
alertView.message=String(pickerView.selectedRowInComponent(0)) + "-"
+ String(pickerView!.selectedRowInComponent(1)) + "-"
+ String(pickerView.selectedRowInComponent(2))
alertView.addButtonWithTitle("OK")
alertView.show()
}
//2,调整选择框的尺寸
// UIPickerView 用 frame 和 center 两个属性设置整个选择框的大小和位置。
//如果要调整内部列的宽度,需要实现 UIPickerViewDelegate 协议类中pickerView:widthForComponent 方法设置
//如果要调整内部行高,则需要实习上述协议类中 pickerView:rowHeightForComponent 方法设置
// 原文出自:www.hangge.com 转载请保留原文链接:http://www.hangge.com/blog/cache/detail_541.html
//设置列宽
func pickerView(pickerView: UIPickerView,widthForComponent component: Int) -> CGFloat{
if(0 == component){
//第一列变宽
return 50
}else{
//第二、三列变窄
return 50
}
}
//设置行高
func pickerView(pickerView: UIPickerView,rowHeightForComponent component: Int) -> CGFloat{
return 50
}
//3,将图片作为选择框选项
//选择框选项的内容,除了可以使字符串类型的,还可以是任意UIView类型的元素。比如我们将选项内容设置为图片:
// func pickerView(pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusingView view: UIView?) -> UIView {
// let image = UIImage(named: "hello.png" + String(row))
// let imageView = UIImageView()
// imageView.image = image
// return imageView
//
// }
//4,检测响应选项的选择状态
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
//将在滑动停止后触发,并打印出选中列和行索引
print(component)
print(row)
}
}