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》
