Objective-C协议和类别可以继承吗

Objective-C协议和类别是面向对象编程中非常有用的特性。协议提供了一种定义方法和属性的方式，而类别则允许为现有的类添加新的方法。但是，协议和类别本身并不支持继承。

objective-c
@protocol Printable
- (void)print;
@end

objective-c
@interface Person : NSObject 
// 类的属性和方法
@end
@implementation Person
- (void)print {
    NSLog(@"Printing person information");
}
// 其他方法的实现
@end

objective-c
@interface NSString (Reverse)
- (NSString *)reverse;
@end
@implementation NSString (Reverse)
- (NSString *)reverse {
    NSMutableString *result = [NSMutableString string];
    NSInteger length = [self length];
    while (length > 0) {
        [result appendString:[NSString stringWithFormat:@"%c", [self characterAtIndex:--length]]];
    }
    return result;
}
@end

objective-c
NSString *str = @"Hello World";
NSString *reversedStr = [str reverse];
NSLog(@"Reversed string: %@", reversedStr);

objective-c
@interface Student : Person 
// 类的属性和方法
@end
@implementation Student
// Student类的实现
@end