1 // 2 //  main.m 3 //  03-arc-循环引用 4 // 5 //  Created by apple on 13-8-11. 6 //  Copyright (c) 2013年 itcast. All rights reserved. 7 // 8  9 #import 
     
      10 11 @class Dog;12 13 @interface Person : NSObject14 15 @property (nonatomic, strong) Dog *dog;16 17 @end18 19 #import "Person.h"20 21 @implementation Person22 23 - (void)dealloc24 {25     NSLog(@"Person--dealloc");26 }27 28 @end29 30 31 #import 
      
       32 33 @class Person;34 35 @interface Dog : NSObject36 37 @property (nonatomic, weak) Person *person;38 39 @end40 41 #import "Dog.h"42 43 @implementation Dog44 - (void)dealloc45 {46     NSLog(@"Dog--dealloc");47 }48 @end49 50 51 52 #import 
       
        53 #import "Person.h"54 #import "Dog.h"55 56 /*57  当两端循环引用的时候，解决方案：58  1> ARC59  1端用strong，另1端用weak60  61  2> 非ARC62  1端用retain，另1端用assign63  */64 65 int main()66 {67     Person *p = [[Person alloc] init];68     69     70     Dog *d = [[Dog alloc] init];71     p.dog = d;72     d.person = p;73 74     return 0;75 }