Person类，Dog类循环引用，重写dealloc方法，完成内存管理

main.m

1. #import <Foundation/Foundation.h>
   
2. #import "Person.h"
   
3. #import "Dog.h"
   
4. 
   
5. int main(int argc, const char * argv[]) {
   
6.     @autoreleasepool {
   
7.         Person *p=[[Person alloc]init];//p 1
   
8.         Dog *d=[[Dog alloc]init];//d 1
   
9.         p.dog=d;//p 2
   
10.         d.owner=p;//d 1
    
11.         
    
12.         [p cook];
    
13.         [d run];
    
14.         
    
15.         [d release];//d 1
    
16.         [p release];//d 0  p 0
    
17.         
    
18.     }
    
19.     return 0;
    
20. }

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Person.h

1. #import <Foundation/Foundation.h>
   
2. //#import "Dog.h"
   
3. @class Dog;
   
4. @interface Person : NSObject
   
5. @property(nonatomic,retain) Dog *dog;
   
6. -(void)cook;
   
7. @end

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Person.m

1. #import "Person.h"
   
2. 
   
3. @implementation Person
   
4. -(void)dealloc{
   
5.     [_dog release];
   
6.     NSLog(@"person----dealloc!");
   
7.     [super dealloc];
   
8. }
   
9. -(void)cook{
   
10.     NSLog(@"cooking");
    
11. }
    
12. @end

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Dog.h

1. #import <Foundation/Foundation.h>
   
2. //#import "Person.h"
   
3. @class Person;
   
4. @interface Dog : NSObject
   
5. @property(nonatomic,assign) Person *owner;
   
6. -(void)run;
   
7. @end

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Dog.m

1. @implementation Dog
   
2. -(void)dealloc{
   
3. //    [_owner release];//因为p获取d用的是retain，而d获取p用的是assign，所以不需要这句
   
4.     NSLog(@"dog----dealloc");
   
5.     [super dealloc];
   
6. }
   
7. -(void)run{
   
8.     NSLog(@"running");
   
9. }
   
10. @end

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StillSad 发表于 2015-10-25 12:35
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