Objective-C：MRC(引用計數器)獲得對象所有權的方式(init、retain、copy等)

標籤：

     .h聲明檔案

 1 //  Integer.h 2 //  02-MRC 3 // 4 //  Created by ma c on 15/8/13. 5 //  Copyright (c) 2015年 bjsxt. All rights reserved. 6 // 7  8 #import <Foundation/Foundation.h> 9 10 @interface Integer : NSObject11 @property(nonatomic,assign)NSInteger i;12 -(id)initWithI:(NSInteger) i;13 -(void) print;14 +(Integer *)integerWithIntger:(NSInteger) i;15 @end

 

　　.m實現檔案

 1 //  Integer.m 2 //  02-MRC 3 // 4 //  Created by ma c on 15/8/13. 5 //  Copyright (c) 2015年 bjsxt. All rights reserved. 6 // 7  8 #import "Integer.h" 9 10 @implementation Integer11 -(id)initWithI:(NSInteger) i12 {13     self = [super init];14     if(self)15     {16         _i = i;17     }18     return self;19 }20 +(Integer *)integerWithIntger:(NSInteger) i21 {22     return [[Integer alloc]initWithI:i];23 }24 25 -(void) print26 {27     NSLog(@"i = %ld",_i);28 }29 -(void)dealloc30 {31     NSLog(@"integer dealloc");32     [super dealloc];33 }34 @end

　

　　　主函數測試

 1 //  main.m 2 //  02-MRC 3 // 4 //  Created by ma c on 15/8/13. 5 //  Copyright (c) 2015年 bjsxt. All rights reserved. 6 // 7  8 #import <Foundation/Foundation.h> 9 #import "Integer.h"10 int main(int argc, const char * argv[])11 {12     @autoreleasepool13     {14         //測試手動引用計數15         //1.建立對象會獲得對象所有權16         Integer *i1 = [[Integer alloc]initWithI:10];17         NSLog(@"retaincount = %lu",[i1 retainCount]);//118         19         20         //2.只通過指標賦值，不會獲得對象所有權21         Integer *i2 = i1;22         NSLog(@"retaincount = %lu",[i2 retainCount]);//123         24         25         //3.通過retain會獲得對象的所有權26         [i1 retain];27         NSLog(@"retaincount = %lu",[i1 retainCount]);//228         29         30         //4.將對象添加到容器中,容器中會儲存物件的一個引用,會獲得對象所有權31         NSMutableArray *array = [NSMutableArray array];32         [array addObject:i1];33         NSLog(@"retaincount = %lu",[i1 retainCount]);//334         35         36         //5.通過release釋放對象的所有權37         [i1 release];38         NSLog(@"retaincount = %lu",[i1 retainCount]);//239         40         41         //6.從容器中刪除對象，也會釋放對象所有權42         [array removeObject:i1];43         NSLog(@"retaincount = %lu",[i1 retainCount]);//144         45         //7.最後再釋放一次,對象才會被正常銷毀46         [i1 release];  //此時,底層會調用dealloc方法     //047     }48     return 0;49 }

 

　　  測試結果是:

2015-08-13 17:32:36.408 02-MRC[1599:103515] retaincount = 12015-08-13 17:32:36.409 02-MRC[1599:103515] retaincount = 12015-08-13 17:32:36.410 02-MRC[1599:103515] retaincount = 22015-08-13 17:32:36.410 02-MRC[1599:103515] retaincount = 32015-08-13 17:32:36.410 02-MRC[1599:103515] retaincount = 22015-08-13 17:32:36.410 02-MRC[1599:103515] retaincount = 12015-08-13 17:32:36.410 02-MRC[1599:103515] integer deallocProgram ended with exit code: 0

 

Objective-C：MRC(引用計數器)獲得對象所有權的方式(init、retain、copy等)