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我正在尝试将一些代码从Objective-c迁移到Swift,但是当我想要使用Objective-c协议符合Swift类并从objetive-c类访问此类时,我在开始时遇到问题.我做错了什么,但我没有看到.

用于测试的Objective-c协议和obj-c类(test_class.h)

#import <Foundation/Foundation.h>

@protocol test_delegate

-(void)returnData:(NSString*)data InMethod:(NSString*)method;
@end

@interface test_class : NSObject

@property (weak, nonatomic) id<test_delegate> delegate;
-(void)sendData:(NSString * )data;
@end

Objective-c实施

#import "test_class.h"

@implementation test_class

-(id) init{
    self = [super init];
    if (self != nil){
        self.delegate= nil;
    }
    return self;
}
-(id) initWithDelegate:(id<test_delegate>) delegate{
    self = [super init];
    if (self != nil){
        self.delegate = delegate;

    }
    return self;
}


-(void)sendData:(NSString *)data{

    [self.delegate returnData:data InMethod:@"method test"];
}
@end

Objetive-c brigde文件

//
//  Use this file to import your target's …