ios – 文件范围？ Swift代表和协议

我正在努力构建一个新的 Swift应用程序,大致基于一个旧的Obj-C应用程序.我目前正在为代表们工作

这是我的Obj-C代码在.h文件中的样子

@interface MyAppViewController : CustomViewController
@property (nonatomic,weak) id<MyAppViewControllerDelegate> delegate;
@end

@protocol MyAppViewControllerDelegate <NSObject>
- (void)myAppViewController:(MyAppViewController *)controller loggedInstudent:    (MYstudent *)student;
- (void)myAppViewControllerWantsSignUp:(MyAppViewController *)controller;
@end

在SWIFT我做了：

class MyAppViewController: CustomViewController {

var delegate: MyAppViewControllerDelegate?
protocol MyAppViewControllerDelegate{
func myAppViewController(controller: MyAppViewController,loggedInstudent:     MYstudent)
func myAppViewControllerWantsSignUp(controller: MyAppViewController)

我已经做了很多阅读和研究,所以我认为我做的基本上是正确的(尽管很快,但是……)

我收到此错误,“声明仅在文件范围内有效”,协议MyAppViewControllerDelegate {
我认为这与在类中声明它有关,所以我把它移出来,只是现在我的代码中的代码不能识别我声明的委托变量.

有任何想法吗？

protocol MyAppViewControllerDelegate {
    func myAppViewController(controller: MyAppViewController,loggedInstudent:     MYstudent)
    func myAppViewControllerWantsSignUp(controller: MyAppViewController)
}

class MyAppViewController: CustomViewController {

    var delegate: MyAppViewControllerDelegate?
}

protocol MyAppViewControllerDelegate : class {
    func myAppViewController(controller: MyAppViewController,loggedInstudent:     MYstudent)
    func myAppViewControllerWantsSignUp(controller: MyAppViewController)
}

class MyAppViewController: CustomViewController {

    weak var delegate: MyAppViewControllerDelegate?
}