iOS复习笔记7:循环引用问题

标签：objective-c   ios   内存管理   循环引用   

// Person.h
@class Car


@interface Person


@property(noatomic, retain) Car* car; 


@end

// Person.m
#import "Person.h"


@implementation Person


- (void)dealloc
{
	[_car release];
	_car = nil;


	[super dealloc];
}


@end

// Car.h
@class Person


@interface Car


@property(noatomic, retain) Person* person; 


@end

// Car.m
#import "Car.h"


@implementation Car


- (void)dealloc
{
	[_person release];


	[super dealloc];
}


@end

// main.m
#import "Car.h"
#import "Person.h"


int main()
{
	Person* person = [[Person alloc] init];// person 1
	Car* car = [[Car alloc] init];// car 1
	person.car = car;// car 2
	car.person = person;// person 2
	[car release];// car 1
	[person release];// person 1


	return 0;
}

// Car.h
@class Person


@interface Car


@property(noatomic, assign) Person* person; 


@end

// Car.m
#import "Car.h"


@implementation Car


- (void)dealloc
{
	[super dealloc];
}


@end

// main.m
#import "Car.h"
#import "Person.h"

int main()
{
	Person* person = [[Person alloc] init];// person 1
	Car* car = [[Car alloc] init];// car 1
	person.car = car;// car 2
	car.person = person;// person 1
	[car release];// car 1
	[person release];// person 0,car 0

	return 0;
}

iOS复习笔记7:循环引用问题

标签：objective-c   ios   内存管理   循环引用   

原文地址：http://blog.csdn.net/xufeng0991/article/details/43273045