在实现目标C中相同协议的类之间共享通用方法实现

// 定义一个协议
@protocol SharedProtocol
- (void)sharedMethod;
@end

// 实现协议的类A
@interface ClassA : NSObject <SharedProtocol>
@end

@implementation ClassA
- (void)sharedMethod {
    NSLog(@"ClassA shared method");
}
@end

// 实现协议的类B
@interface ClassB : NSObject <SharedProtocol>
@end

@implementation ClassB
- (void)sharedMethod {
    NSLog(@"ClassB shared method");
}
@end

// 类别为目标C添加共享方法
@interface ClassC (SharedCategory)
- (void)sharedMethod;
@end

@implementation ClassC (SharedCategory)
- (void)sharedMethod {
    NSLog(@"ClassC shared method");
}
@end

// 目标C类
@interface ClassC : NSObject
@end

@implementation ClassC
@end

// 使用示例
ClassA *a = [[ClassA alloc] init];
ClassB *b = [[ClassB alloc] init];
ClassC *c = [[ClassC alloc] init];

[a sharedMethod]; // 输出：ClassA shared method
[b sharedMethod]; // 输出：ClassB shared method
[c sharedMethod]; // 输出：ClassC shared method