为什么视图控制器不符合uipickerviewdatasource？我已经检查了我可以从网络调试的一切。我已经为协议输入了所有必要的功能（Swift3.1），但徒劳无功。这是我的代码：classSelectClassViewController:UIViewController,UIPickerViewDelegate,UIPickerViewDataSource{letgrades=["7","8","9","10","11","12"]varselectCurrentGrade:String?=nil@IBOutletweakvarGrade:UIPickerView!@IBActionf

importUIKitclassFourthViewController:UIViewController,UIPickerViewDelegate,UIPickerViewDataSource{@IBOutletweakvarpicker:UIPickerView!varpickerData:[String]=[String]()overridefuncviewDidLoad(){super.viewDidLoad()//Doanyadditionalsetupafterloadingtheview.self.picker.delegate=selfself.picker.dataS

我刚刚在Swift中创建了一个新类，它叫做myViewController，它是一个UIViewController。现在，我试图将其设为UIPickerViewDelegate和DataSource，但我遇到了一个奇怪的错误importUIKitclassmyViewController:UIViewController,UIPickerViewDelegate,UIPickerViewDataSource{...}它说Type"myViewController"doesnotconformtoprotocolUIPIckerDataSourceovertheUIPickerView

我刚刚在Swift中创建了一个新类，它叫做myViewController，它是一个UIViewController。现在，我试图将其设为UIPickerViewDelegate和DataSource，但我遇到了一个奇怪的错误importUIKitclassmyViewController:UIViewController,UIPickerViewDelegate,UIPickerViewDataSource{...}它说Type"myViewController"doesnotconformtoprotocolUIPIckerDataSourceovertheUIPickerView

我不知道我的代码有什么问题。我尝试按照教程进行操作，但发生了同样的错误。错误:Type'FourthViewController'doesnotconformtoprotocol'UIPickerViewDataSource'这是我的代码:importUIKitletcharacters=["JajaBink","Luke","HanSolo","PrincessLeia"];letweapons=["LightSaber","Pistol","Keris"];classFourthViewController:UIViewController,UIPickerViewDataSour