//  Integer.h

 //  02-MRC

 //

 //  Created by ma c on 15/8/13.

 //  Copyright (c) 2015年. All rights reserved.

 //

 #import <Foundation/Foundation.h>

 @interface Integer : NSObject

 @property(nonatomic,assign)NSInteger i;

 -(id)initWithI:(NSInteger) i;

 -(void) print;

 +(Integer *)integerWithIntger:(NSInteger) i;

 @end

 //  Integer.m

 //  02-MRC

 //

 //  Created by ma c on 15/8/13.

 //  Copyright (c) 2015年. All rights reserved.

 //

 #import "Integer.h"

 @implementation Integer

 -(id)initWithI:(NSInteger) i

 {

     self = [super init];

     if(self)

     {

         _i = i;

     }

     return self;

 }

 +(Integer *)integerWithIntger:(NSInteger) i

 {

     return [[Integer alloc]initWithI:i];

 }

 -(void) print

 {

     NSLog(@"i = %ld",_i);

 }

 -(void)dealloc

 {

     NSLog(@"integer dealloc");

     [super dealloc];

 }

 @end

 //  main.m

 //  02-MRC

 //

 //  Created by ma c on 15/8/13.

 //  Copyright (c) 2015年. All rights reserved.

 //

 #import <Foundation/Foundation.h>

 #import "Integer.h"

 int main(int argc, const char * argv[])

 {

     @autoreleasepool

     {

         //测试手动引用计数

         //1.创建对象会获得对象所有权

         Integer *i1 = [[Integer alloc]initWithI:];

         NSLog(@"retaincount = %lu",[i1 retainCount]);//1

         //2.只通过指针赋值，不会获得对象所有权

         Integer *i2 = i1;

         NSLog(@"retaincount = %lu",[i2 retainCount]);//1

         //3.通过retain会获得对象的所有权

         [i1 retain];

         NSLog(@"retaincount = %lu",[i1 retainCount]);//2

         //4.将对象添加到容器中,容器中会存储对象的一个引用,会获得对象所有权

         NSMutableArray *array = [NSMutableArray array];

         [array addObject:i1];

         NSLog(@"retaincount = %lu",[i1 retainCount]);//3

         //5.通过release释放对象的所有权

         [i1 release];

         NSLog(@"retaincount = %lu",[i1 retainCount]);//2

         //6.从容器中删除对象，也会释放对象所有权

         [array removeObject:i1];

         NSLog(@"retaincount = %lu",[i1 retainCount]);//1

         //7.最后再释放一次,对象才会被正常销毁

         [i1 release];  //此时,底层会调用dealloc方法     //

     }

     return ;

 }

-- ::36.408 -MRC[:] retaincount =

-- ::36.409 -MRC[:] retaincount =

-- ::36.410 -MRC[:] retaincount =

-- ::36.410 -MRC[:] retaincount =

-- ::36.410 -MRC[:] retaincount =

-- ::36.410 -MRC[:] retaincount =

-- ::36.410 -MRC[:] integer dealloc

Program ended with exit code: