答案是不行的。OC不支持多层继承，但可以通过遵守多个协议实现多继承。
#import <Foundation/Foundation.h>
@protocol Add <NSObject>
- (int)addA:(int)a b:(int)b;
@end
#import <Foundation/Foundation.h>
@protocol Sub <NSObject>
- (int)subA:(int)a b:(int)b;
@end
#import <Foundation/Foundation.h>
@protocol Mul <NSObject>
- (int)mulA:(int)a b:(int)b;
@end
==================================================以上是三个协议
下面是新建一个继承与NSObject的计算类Calculator
#import <Foundation/Foundation.h>
#import "Add.h"
#import "Sub.h"
#import "Mul.h"
//遵守多个协议
//类似于c++的多继承
@interface Calculator : NSObject <Add,Sub,Mul>
@end
#import "Calculator.h"
@implementation Calculator
- (int)addA:(int)a b:(int)b {
return a+b;
}
- (int)subA:(int)a b:(int)b {
return a-b;
}
- (int)mulA:(int)a b:(int)b {
return a*b;
}
@end
==========================================
#import <Foundation/Foundation.h>
#import "Calculator.h"
int main(int argc, const char * argv[]) {
@autoreleasepool {
Calculator *calc = [[Calculator alloc] init];
NSLog(@"%d",[calc addA:1 b:1]);//2
NSLog(@"%d",[calc subA:1 b:1]);//0
NSLog(@"%d",[calc mulA:1 b:1]);//1
}
return 0;
}
