Objective-C 中的多重继承[重复]

使用Objective-C进行编程时，多重继承是一项非常重要的特性。多重继承允许一个类从多个父类继承属性和方法，从而使得代码的复用性更强，结构更加灵活。在本文中，我们将探讨Objective-C中的多重继承的概念、使用方法以及一些案例代码的演示。

objective-c
@protocol Swimming
- (void)swim;
@end

objective-c
@interface Fish : NSObject 
@end
@implementation Fish
- (void)swim {
    NSLog(@"Fish is swimming.");
}
@end

objective-c
Fish *fish = [[Fish alloc] init];
[fish swim]; // 输出：Fish is swimming.

objective-c
@interface Role : NSObject
@property (nonatomic, strong) NSString *name;
- (void)attack;
@end
@implementation Role
- (void)attack {
    // 默认攻击方法的实现
}
@end

objective-c
@interface Warrior : Role 
@end
@implementation Warrior
- (void)swim {
    NSLog(@"Warrior is swimming.");
}
- (void)useSkill {
    NSLog(@"Warrior is using skill.");
}
@end

objective-c
Warrior *warrior = [[Warrior alloc] init];
warrior.name = @"John";
[warrior attack]; // 输出：Warrior John is attacking.
[warrior swim]; // 输出：Warrior is swimming.
[warrior useSkill]; // 输出：Warrior is using skill.