无法通过委托访问协议方法

Question

通过委托访问协议方法时出现以下错误： "No known instance method for selector 'lostConnection'"

Swift 协议：

@objc protocol GameDelegate {
    func lostConnection()
}

Objective C游戏文件

//game.h

@protocol GameDelegate;
@interface SSStreamManager : NSObject 

@property (assign) id<GameDelegate> delegate

@end

调用协议方法时出错

[self.delegate lostConnection]; // No known instance method for selector 'lostConnection'

Answer 1

您没有显示任何实际代码，但这里有一个示例可以帮助您入门。这些是 iOS 应用程序项目中的三个文件：

ViewController.swift

import UIKit
@objc protocol GameDelegate {
    func lostConnection()
}
class ViewController: UIViewController {
}

Thing.h

#import <Foundation/Foundation.h>
@protocol GameDelegate;
@interface Thing : NSObject
@property (assign) id<GameDelegate> delegate;
@end

Thing.m

#import "Thing.h"
#import "MyApp-Swift.h"
@implementation Thing
- (void) test {
    [self.delegate lostConnection];
}
@end

即编译。您应该能够在自己的代码中遵循此模型。

Unable to access protocol methods via delegate