Objective-C class_conformsToProtocol() 错误

使用 Objective-C 进行 iOS 或 macOS 开发时，我们经常会使用协议（Protocol）来定义对象之间的通信规范。协议可以指定一组方法、属性或其他需求，而遵循该协议的对象则需要实现这些方法或属性。在某些情况下，我们可能需要在运行时检查一个类是否遵循了某个特定的协议。Objective-C 提供了一个函数 class_conformsToProtocol() 来完成这个任务。

objective-c
Class myClass = [MyClass class];
Protocol *myProtocol = @protocol(MyProtocol);
if (class_conformsToProtocol(myProtocol, myClass)) {
    NSLog(@"MyClass conforms to MyProtocol");
} else {
    NSLog(@"MyClass does not conform to MyProtocol");
}

objective-c
Class myClass = [MyClass class];
Protocol *myProtocol = @protocol(MyProtocol);
if (class_conformsToProtocol(myClass, myProtocol)) {
    NSLog(@"MyClass conforms to MyProtocol");
} else {
    NSLog(@"MyClass does not conform to MyProtocol");
}

objective-c
@protocol MyProtocol
- (void)myMethod;
@end
@interface MyClass : NSObject 
@end
@implementation MyClass
- (void)myMethod {
    NSLog(@"MyMethod implementation");
}
@end
int main(int argc, const char * argv[]) {
    @autoreleasepool {
        Class myClass = [MyClass class];
        Protocol *myProtocol = @protocol(MyProtocol);
        if (class_conformsToProtocol(myClass, myProtocol)) {
            NSLog(@"MyClass conforms to MyProtocol");
        } else {
            NSLog(@"MyClass does not conform to MyProtocol");
        }
    }
    return 0;
}