pragma mark MRC项目转ARC项目

pragma mark 概念

/**
 MRC 转 ARC 通过 Xcode中
 Edit --> Convert(转换)  --> to Objective-C ARC (转换成ARC)
 然后出现一个预览的界面
 
 左边是 修改之后的代码区、
 右边是 修改之前的代码区
 */

pragma mark 代码

#import <Foundation/Foundation.h>
#pragma mark 类
#import "Person.h"
#import "Dog.h"
#import "Bone.h"
#pragma mark main函数
int main(int argc, const char * argv[])
{
    Person *p = [Person new];
    Dog *d = [Dog new];
    Bone *b = [Bone new];
    

    return 0;
}

Person.h //人类

#import <Foundation/Foundation.h>
@class Dog;
@interface Person : NSObject
@property (nonatomic, strong) Dog *dog;

@end

Person.m

#import "Person.h"
#import "Dog.h"
@implementation Person
- (void)dealloc
{
    NSLog(@"%s",__func__);
}
@end

Dog.h //狗类

#import <Foundation/Foundation.h>

@class Bone;

@interface Dog : NSObject

@property(nonatomic, retain)Bone *bone;


@end

Dog.m

#import "Dog.h"
#import "Bone.h"
@implementation Dog

- (void)dealloc
{
    NSLog(@"%s",__func__);
}

@end

Person.h //骨头类

#import <Foundation/Foundation.h>

@interface Bone : NSObject

@end

Person.m

#import "Bone.h"

@implementation Bone
- (void)dealloc
{
    [super dealloc];
}
@end