gowhich演示了一个实例，实现功能很简单
一个人叫做durban，想要找房子，然后正好有个中介，可以帮助durban找房子。
先做创建一个人的实例的准备：
Person.h
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#import <Foundation/Foundation.h>
#import "FindAparment.h"
@interface Person : NSObject<FindAparment>
@property (nonatomic, copy) NSString *name;
@property (nonatomic, assign) id <FindAparment> delegate;
@property HouseRent rent;
-(void)wantToFindApartment;
-(id) initWithName:(NSString *)name withDelegate:(id <FindAparment>)delegate;
@end
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Person.m
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#import "Person.h"
@implementation Person
@synthesize name = _name;
@synthesize delegate = _delegate;
@synthesize rent = _rent;
-(id) initWithName:(NSString *)name withDelegate:(id <FindAparment>)delegate
{
self = [super init];
if(self)
{
self.name = name;
self.delegate = delegate;
}
return self;
}
-(void) wantToFindApartment
{
[NSTimer scheduledTimerWithTimeInterval:2 target:self
selector:@selector(startFindAparment:)
userInfo:nil
repeats:YES];
}
-(void)startFindAparment:(NSTimer *) timer
{
if([self.delegate respondsToSelector:@selector(FindAparment:)])
{
self.rent = [self.delegate FindAparment:self];
}
if(self.rent == kHighRent)
{
NSLog(@"%@ 说: 太贵了，你们再找找吧",self.name);
}
else if(self.rent == kMiddleRent)
{
NSLog(@"%@ 说: 还是太贵了，你们再找找吧",self.name);
}
else
{
NSLog(@"%@ 说: 就这个吧，辛苦啦",self.name);
[timer invalidate];
}
}
@end
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接下来做创建中介实例的准备：
Agent.h
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#import <Foundation/Foundation.h>
#import "FindAparment.h"
@interface Agent : NSObject<FindAparment>
@end
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Agent.m
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#import "Agent.h"
@implementation Agent
-(HouseRent) FindAparment:(Person *)person
{
int count = arc4random() % 3;
HouseRent rent;
if(count == 1)
{
rent = kHighRent;
NSLog(@"中介公司说：我们找到了一个价格较高的公寓");
}
else if(count == 2)
{
rent = kMiddleRent;
NSLog(@"中介公司说：我们找到了一个价格较合适的公寓");
}
else
{
rent = kLowerRent;
NSLog(@"中介公司说：我们找到了一个价格较低的公寓");
}
return rent;
}
@end
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给中介一个找房子的方法，这里使用了代理模式
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#import <Foundation/Foundation.h>
@class Person;
@protocol FindAparment <NSObject>
typedef enum{
kHighRent = 0,
kMiddleRent = 1,
kLowerRent = 2,
}HouseRent;
-(HouseRent) FindAparment:(Person *)person;
@end
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OK，一切准备就绪，开始找房子喽。
main.m
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#import <Foundation/Foundation.h>
#import "Person.h"
#import "Agent.h"
int main(int argc, const char * argv[])
{
@autoreleasepool {
Agent *agent = [[Agent alloc] init];
Person *durban = [[Person alloc] initWithName:@"Durban" withDelegate:agent];
[durban wantToFindApartment];
[[NSRunLoop currentRunLoop] run];
NSLog(@"Hello, World!");
}
return 0;
}
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结果如下：
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| 2013-11-01 10:53:25.899 Agent[1157:303] 中介公司说：我们找到了一个价格较合适的公寓
2013-11-01 10:53:25.901 Agent[1157:303] Durban 说: 还是太贵了，你们再找找吧
2013-11-01 10:53:27.899 Agent[1157:303] 中介公司说：我们找到了一个价格较高的公寓
2013-11-01 10:53:27.899 Agent[1157:303] Durban 说: 太贵了，你们再找找吧
2013-11-01 10:53:29.898 Agent[1157:303] 中介公司说：我们找到了一个价格较合适的公寓
2013-11-01 10:53:29.899 Agent[1157:303] Durban 说: 还是太贵了，你们再找找吧
2013-11-01 10:53:31.898 Agent[1157:303] 中介公司说：我们找到了一个价格较低的公寓
2013-11-01 10:53:31.899 Agent[1157:303] Durban 说: 就这个吧，辛苦啦
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