1.获取协议

    Protocol *protocol = objc_getProtocol("NSPersonDelegate");
    NSLog(@"protocol:%@",NSStringFromProtocol(protocol));
    

2.拷贝协议列表

    unsigned int outCount;
    Protocol * __unsafe_unretained * protocols = objc_copyProtocolList(&outCount);
    for (int i = 0; i < outCount; i++) {
        
//        NSLog(@"protocols_%d:%s",i,protocol_getName(protocols[i]));
    }

3.判断协议是否遵守了另一个协议

    BOOL is_conform = protocol_conformsToProtocol(@protocol(NSPersonDelegate), @protocol(NSObject));
    NSLog(@"is_conform:%d",is_conform);
    

4.判断两个协议是否为同一个协议

   //获取Protocol
   //objc_getProtocol(const char * _Nonnull name)
   //@protocol
   //NSProtocolFromString(NSString * _Nonnull namestr)
   BOOL is_equal = protocol_isEqual(objc_getProtocol("NSPersonDelegate"), @protocol(NSPersonDelegate));
   
   NSLog(@"is_equal:%d",is_equal);

5.获取协议名

    NSLog(@"protocol_getName:%s",protocol_getName(@protocol(NSPersonDelegate)));

6.获取方法描述

    struct objc_method_description dance_description =  protocol_getMethodDescription(@protocol(NSPersonDelegate), @selector(dance), 1, 1);
    
    struct objc_method_description sing_description =  protocol_getMethodDescription(@protocol(NSPersonDelegate), @selector(sing), 1, 0);

    struct objc_method_description work_description =  protocol_getMethodDescription(@protocol(NSPersonDelegate), @selector(work), 0, 1);

    struct objc_method_description rest_description =  protocol_getMethodDescription(@protocol(NSPersonDelegate), @selector(rest), 0, 0);

    
    NSLog(@"dance_description:%@,%s",NSStringFromSelector(dance_description.name),dance_description.types);
    
    NSLog(@"sing_description:%@,%s",NSStringFromSelector(sing_description.name),sing_description.types);
    
    NSLog(@"work_description:%@,%s",NSStringFromSelector(work_description.name),work_description.types);
    
    NSLog(@"rest_description:%@,%s",NSStringFromSelector(rest_description.name),rest_description.types);

7.获取方法描述列表

   
    unsigned int protocol_count;
    struct objc_method_description *protocol_descriptions = protocol_copyMethodDescriptionList(@protocol(NSPersonDelegate), 1, 1, &protocol_count);
    
    for (int i = 0; i < protocol_count; i++) {
        struct objc_method_description protocol_desc = *(protocol_descriptions + i);
        NSLog(@"protocol_desc_%i:%@,%s",i,NSStringFromSelector(protocol_desc.name),protocol_desc.types);
    }

8.获取指定属性

    objc_property_t grade_property = protocol_getProperty(@protocol(NSPersonDelegate), "grade", 1, 1);
    NSLog(@"grade_property:%s",property_getName(grade_property));

9.拷贝属性列表

    //Returns an array of the required instance properties declared by a protocol
    unsigned int property_count_0;
    objc_property_t *properties_0 = protocol_copyPropertyList(@protocol(NSPersonDelegate), &property_count_0);
    
    for(int i = 0; i < property_count_0; i++)
    {
        NSLog(@"properties_0_%i:%s",i,property_getName(*(properties_0 + i)));
    }
    free(properties_0);

10.获取属性列表

    //10. Returns an array of properties declared by a protocol.
    
    //isRequiredProperty 必须是YES,获取到require和optional ,NO获取到NULL
    unsigned int property_count_1;

    objc_property_t *properties_1 = protocol_copyPropertyList2(@protocol(NSPersonDelegate), &property_count_1, 1, 0);
    
    for(int i = 0; i < property_count_1; i++)
    {
        NSLog(@"properties_1_%i:%s",i,property_getName(*(properties_1 + i)));
    }
    
    free(properties_1);

11.拷贝所遵守的协议列表

    unsigned int protocol_protocol_count;
    Protocol * __unsafe_unretained *protocol_protocols = protocol_copyProtocolList(@protocol(NSPersonDelegate), &protocol_protocol_count);
    for (int i = 0 ; i < protocol_protocol_count; i++) {
        NSLog(@"protocol_protocols_%i:%s",i,protocol_getName(*(protocol_protocols + i)));
    }
    
    free(protocol_protocols);

12.动态创建协议

    Protocol *NSPersonDataSource = objc_allocateProtocol("NSPersonDataSource");
    
    //12-1.
    protocol_addMethodDescription(NSPersonDataSource, @selector(abc), "v@:", 1, 1);
    struct objc_method_description abc_description =  protocol_getMethodDescription(NSPersonDataSource, @selector(abc), 1, 1);
    NSLog(@"abc_description:%@,%s",NSStringFromSelector(abc_description.name),abc_description.types);


    
    //12-2.
    protocol_addProtocol(NSPersonDataSource, @protocol(NSCopying));
    unsigned int protocol_protocol_count2;
    Protocol * __unsafe_unretained *protocol_protocols_2 = protocol_copyProtocolList(NSPersonDataSource, &protocol_protocol_count2);
    for (int i = 0 ; i < protocol_protocol_count; i++) {
        NSLog(@"protocol_protocols_%i:%s",i,protocol_getName(*(protocol_protocols_2 + i)));
    }
    
    free(protocol_protocols_2);

    
    //12-3.
    
    objc_property_attribute_t name_t = {"T","@\"NSString\""};
    objc_property_attribute_t name_owner = {"C",""};
    objc_property_attribute_t name_atomic = {"N",""};
    objc_property_attribute_t name_rw = {"R",""};
    objc_property_attribute_t name_i = {"V","_name"};
    objc_property_attribute_t name_attr[] = {name_t,name_owner,name_atomic,name_rw,name_i};
    
    protocol_addProperty(NSPersonDataSource, "name", name_attr, 5, 1, 1);
    
    
    objc_property_t name_property = protocol_getProperty(NSPersonDataSource, "name", 1, 1);
    NSLog(@"grade_property:%s,%s",property_getName(name_property),property_getAttributes(name_property));
    

    objc_registerProtocol(NSPersonDataSource);