在Obj-C类中找不到Swift协议声明

@objc public protocol YOURSwiftDelegate {
    func viewReceiptPhoto()
    func amountPicked(selected: Int)
}

class YourClass: NSObject {
    weak var delegat: YOURSwiftDelegate?
}

在Objective-C headerFile中。h

@protocol YOURSwiftDelegate;

@interface YOURController : UIViewController < YOURSwiftDelegate >

SwiftObject * swiftObject = [SwiftObject alloc] init];
swiftObject.delegate = self

定义您的 在你的Swift文件中这样的协议。

@objc protocol SpeechRecognizerDelegate: class{
  func speechRecognitionFinished(_ transcription:String)
  func speechRecognitionError(_ error:Error)
}

在项目设置中创建Swift模块,然后使用它。你可以找到 here complete blog

协议 在…内 文件-

#import "ARBot-Swift.h"

@interface ChatScreenViewController : JSQMessagesViewController <SpeechRecognizerDelegate>

协议 方法-

- (void)viewDidLoad {
    [super viewDidLoad];
    SpeechRecognizer * speechRecognizer = [[SpeechRecognizer alloc] init];
    speechRecognizer.delegate = self;
}


#pragma mark - Delegate Methods
-(void)speechRecognitionFinished:(NSString *) transcription{
   //Do something here
}

-(void)speechRecognitionError:(NSError *) error{
   //Do something here
}

添加 @objc

@objc protocol SpeechRecognizerDelegate : class  {
    //...
}

使用转发声明在Objective-C标头中包含Swift类

//MySwiftClass.swift
@objc protocol MySwiftProtocol {}
@objcMembers class MySwiftClass {}

// MyObjcClass.h
@class MySwiftClass;
@protocol MySwiftProtocol;

@interface MyObjcClass : NSObject
- (MySwiftClass *)returnSwiftClassInstance;
- (id <MySwiftProtocol>)returnInstanceAdoptingSwiftProtocol;
// ...
@end