swift3.0 PickerView的应用

  PickerView的使用需实现UIPickerViewDelegate,UIPickerViewDataSource这两个协议

class ViewController: UIViewController ,UIPickerViewDelegate,UIPickerViewDataSource {

    
    var pickerData: NSDictionary!   //保存全部数据的字典
    var pickerProvincesData: NSArray!   //保存当前省数据的数组
    var pickerCitiesData: NSArray!  //保存当前省下面市数据的数组
    var pickerView: UIPickerView!
    var LabelPickerView: UILabel!

override func viewDidLoad() {
        super.viewDidLoad()

        let plistPath = Bundle.main.path(forResource: "provinces_cities", ofType: "plist")
        let dict = NSDictionary(contentsOfFile: plistPath!)
        self.pickerData = dict
        
        self.pickerProvincesData = self.pickerData.allKeys as NSArray!
            //默认取出第一个省的所有市的数据
        let selectedProvince = self.pickerProvincesData[0] as! NSString
        self.pickerCitiesData = self.pickerData[selectedProvince] as! NSArray
            //添加选择器
        self.pickerView = UIPickerView(frame: CGRect(x: (screen.size.width/2 + 10), y: 160, width: screen.size.width/2 - 30, height: 200))
        self.view.addSubview(pickerView)
        self.pickerView.dataSource = self
        self.pickerView.delegate = self
            //添加label
        LabelPickerView = UILabel(frame: CGRect(x: (screen.size.width/2 + 10), y: 400, width: screen.size.width/2 - 30, height: 30))
        self.LabelPickerView.text = "LabelPickerView"
        self.LabelPickerView.textAlignment = .center//字体居中
        self.view.addSubview(LabelPickerView)

}

参考自关东升的《开发指南》