复合:将多个组件组合在一起,形成一个整体,然后使用整体来进行工作,这种组合行为称为复合
复合后的整体功能更加强大
编写一个房屋类,由门,窗户等组成,门和窗有自己的开关方法,然后将门和窗这些复合在一起称为房屋类
调用房屋类的进出方法实际调用到门的开关
调用房屋的换气方法,实际调用到窗户的开关
// 由多个类的对象组成一个大类,就是一个组合的过程
#import <Foundation/Foundation.h>
#import "Widow.h"
#import "Door.h"
@interface House : NSObject
@property (nonatomic, strong) Door *door;
@property (nonatomic, strong) Widow *widow;
-(void)inouthouse;
-(void)exchangair;
@end
#import "House.h"
@implementation House
-(void)inouthouse{
[_door open ];NSLog(@"进屋");
[_door close]; NSLog(@"出屋");
}
-(void)exchangair{
[_widow open];
NSLog(@"开始换气");
[_widow close];
NSLog(@"换气结束");
}
@end
#import <Foundation/Foundation.h>
@interface Widow : NSObject -(void)open;
-(void)close; @end #import "Widow.h"
@implementation Widow -(void)open{ NSLog(@"开窗"); }
-(void)close{ NSLog(@"关窗"); } @end
#import <Foundation/Foundation.h>
@interface Door : NSObject
-(void)open;
-(void)close;
@end
#import "Door.h"
@implementation Door
-(void)open{
NSLog(@"开门");
}
-(void)close{
NSLog(@"关门");
}
@end
#import <Foundation/Foundation.h>
#import "House.h"
int main(int argc, const char * argv[]) {
@autoreleasepool {
House *h=[[House alloc]init];
h.door=[[Door alloc]init];
h.widow=[[Widow alloc]init];
[h inouthouse];
[h exchangair];
}
return 0;
}