OC学习：OC中实现多继承

第一种非协议：将classA类和classB类作为classC类中的属性。

在classC中

#import <Foundation/Foundation.h>
#import "ClassA.h"
#import "ClassB.h"
@interface ClassC : NSObject
@property (nonatomic,strong) ClassA *aClass;
@property (nonatomic,strong) ClassB *bClass;
-(id) init;

@end

#import "ClassC.h"
@implementation ClassC
@synthesize aClass =_classA,bClass = _classB;
//重新初始化方法，给类属性添加对象
-(id) init{
    if (self = [super init]) {
        self.aClass = [ClassA new];
        self.bClass = [ClassB new];
    }
    return self;
}
@end

第二种协议：在OC中用协议实现多继承

1.建立CLassA 类

#import <Foundation/Foundation.h>

@interface ClassA : NSObject
@property (nonatomic,assign) NSInteger ID;
@end

//在ClassA.h文件中定下协议

@protocol ClassAProtocol <NSObject>

//在ClassB.h中定义属性

@property (nonatomic,strong) ClassA *aClass;
@end

2.建立CLassB 类

#import <Foundation/Foundation.h>
@interface ClassB : NSObject
//在ClassB.h中定义属性

@property (nonatomic,strong) NSString *name;
@end

//在ClassB.h中定下协议ClassBProtocol
@protocol ClassBProtocol <NSObject>
@property (nonatomic,strong) ClassB *bClass;
@end

3.建立CLassC 类

#import <Foundation/Foundation.h>
#import "ClassA.h"
#import "ClassB.h"
//在ClassC 中实现协议
@interface ClassC : NSObject <ClassAProtocol,ClassBProtocol>
-(id) init;
@end

#import "ClassC.h"
//在ClassC.m文件中实现协议方法
@implementation ClassC
@synthesize aClass =_classA,bClass = _classB;
//重新初始化方法，给类属性添加对象
-(id) init{
    if (self = [super init]) {
        self.aClass = [ClassA new];
        self.bClass = [ClassB new];
    }
    return self;
}
@end