swift 实践- 12 -- UIPickerView
import UIKit
class ViewController: UIViewController , UIPickerViewDelegate,UIPickerViewDataSource{
var pickerView: UIPickerView!
override func viewDidLoad() {
super.viewDidLoad()
pickerView = UIPickerView()
pickerView.frame = CGRect.init(x: 0, y: 0, width: self.view.frame.size.width, height: 300)
pickerView.delegate = self
pickerView.dataSource = self
// 设置默认值
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)
// 建立一个按钮, 触摸按钮时获得选择框被选择的索引
let button = UIButton.init(frame: CGRect.init(x: 0, y: 0, width: 100, height: 30))
button.center = self.view.center
button.backgroundColor = UIColor.red
button.setTitle("按钮", for: .normal)
self.view.addSubview(button)
button.addTarget(self, action: #selector(buttonAction), for: .touchUpInside)
}
// 设置选择框的列数, 继承于 UIPickerViewDataSource 协议
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 3
}
// 设置选择框的行数, 继承于 UIPickerViewDataSource 协议
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return 9
}
// 设置选择框各项内容的选项, 继承于 UIPickerViewDelegate 协议
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return String(row) + "-" + String(component)
}
// 设置列的宽度, 继承于 UIPickerViewDelegate 协议
// func pickerView(_ pickerView: UIPickerView, widthForComponent component: Int) -> CGFloat {
// return self.view.frame.size.width/3
// }
// 设置行的高度, 继承于 UIPickerViewDelegate 协议
func pickerView(_ pickerView: UIPickerView, rowHeightForComponent component: Int) -> CGFloat {
return 50
}
// 可以将图片作为选择框内容
// 选择框的内容,除了可以是字符串类型的, 还可以是任意 UIView 类型的, 比如我们将选项的内容设置为图片
// 检测响应选项的选择状态
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
print("第 \(component) 列, 第 \(row) 行")
}
// 触摸按钮时,获得被选中的索引
func buttonAction(sender: UIButton) {
let message = String(pickerView.selectedRow(inComponent: 0)) + "-"
+ String(pickerView!.selectedRow(inComponent: 1)) + "-"
+ String(pickerView.selectedRow(inComponent: 2))
print(message)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}