// main.m // 循環retain#import <Foundation/Foundation.h> #import "Person.h" #import "Dog.h"int main(int argc, const char * argv[]) {Person *p = [Person new];Dog *d = [Dog new];// 如果A對用要擁有B對象, 而B對應又要擁有A對象, 此時會形成循環retain// 如何解決這個問題: 不要讓A retain B, B retain A// 讓其中一方不要做retain操作即可p.dog = d; // retaind.owner = p; // retain assign [p release];[d release];return 0; } // Dog.h#import <Foundation/Foundation.h> @class Person;@interface Dog : NSObject//@property(nonatomic, retain)Person *owner; @property(nonatomic, assign)Person *owner; @end // Dog.m#import "Dog.h" #import "Person.h"@implementation Dog-(void)dealloc {NSLog(@"%s", __func__); // [_owner release]; // self.owner = nil; [super dealloc]; } @end // // Person.h#import <Foundation/Foundation.h> @class Dog;@interface Person : NSObject@property(nonatomic, retain)Dog *dog; @end // Person.m#import "Person.h" #import "Dog.h"@implementation Person- (void)dealloc {NSLog(@"%s", __func__); // [_dog release];self.dog = nil;[super dealloc]; } @end

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轉載于:https://www.cnblogs.com/yaowen/p/7428389.html

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