CCLayer 在 init 中调用 schedual 方法后引用计数混乱的问题

来源：互联网发布：公司软件oa 编辑：程序博客网时间：2024/06/14 04:06

参考相关问题链接：

http://www.cocos2d-iphone.org/forum/topic/314

先上代码再解释：

RefferenceCountLayer.h

////  RefferenceCountLayer.h//  HungryBear////  Created by Bruce Yang on 12-8-9.//  Copyright (c) 2012年 EricGameStudio. All rights reserved.//#import "cocos2d.h"@interface RefferenceCountLayer : CCLayer@end

RefferenceCountLayer.mm

////  RefferenceCountLayer.mm//  HungryBear////  Created by Bruce Yang on 12-8-9.//  Copyright (c) 2012年 EricGameStudio. All rights reserved.//#import "RefferenceCountLayer.h"@implementation RefferenceCountLayer-(ccColor4B) randomBrightColor {    while(true) {        float requiredBrightness = 192;        ccColor4B randomColor = ccc4(arc4random() % 255,                                      arc4random() % 255,                                      arc4random() % 255,                                      255);        if (randomColor.r > requiredBrightness ||             randomColor.g > requiredBrightness ||            randomColor.b > requiredBrightness) {            return randomColor;        }            }}-(id) init {    if((self = [super init])) {        self.isTouchEnabled = YES;                ccColor4B color4B = [self randomBrightColor];        CCLayerColor* lyrColor = [CCLayerColor layerWithColor:color4B];        [self addChild:lyrColor];                NSLog(@"init() -> 1.RefferenceCount = %d", [self retainCount]);                [self schedule:@selector(tick:)];                NSLog(@"init() -> 2.RefferenceCount = %d", [self retainCount]);    }    return self;}-(void) draw {    NSLog(@"draw() -> RefferenceCount = %d", [self retainCount]);}-(void) tick:(ccTime)dt {    NSLog(@"tick() -> RefferenceCount = %d", [self retainCount]);}-(void) ccTouchesBegan:(NSSet*)touches withEvent:(UIEvent*)event {    NSLog(@"ccTouchesBegan()");    [[CCDirector sharedDirector] replaceScene:[RefferenceCountLayer node]];}-(void) dealloc {    NSLog(@"ReffenceCountLayer.dealloc!");    [super dealloc];}@end

控制台输出如下：

2012-08-09 00:41:55.733 WonderPipeEffects1[18926:707] init() -> 1.RefferenceCount = 12012-08-09 00:41:55.737 WonderPipeEffects1[18926:707] init() -> 2.RefferenceCount = 22012-08-09 00:41:55.741 WonderPipeEffects1[18926:707] tick() -> RefferenceCount = 42012-08-09 00:41:55.748 WonderPipeEffects1[18926:707] draw() -> RefferenceCount = 42012-08-09 00:41:55.753 WonderPipeEffects1[18926:707] tick() -> RefferenceCount = 42012-08-09 00:41:55.758 WonderPipeEffects1[18926:707] draw() -> RefferenceCount = 42012-08-09 00:41:55.769 WonderPipeEffects1[18926:707] tick() -> RefferenceCount = 42012-08-09 00:41:55.775 WonderPipeEffects1[18926:707] draw() -> RefferenceCount = 42012-08-09 00:41:55.785 WonderPipeEffects1[18926:707] tick() -> RefferenceCount = 42012-08-09 00:41:55.788 WonderPipeEffects1[18926:707] draw() -> RefferenceCount = 42012-08-09 00:41:55.803 WonderPipeEffects1[18926:707] tick() -> RefferenceCount = 42012-08-09 00:41:55.807 WonderPipeEffects1[18926:707] draw() -> RefferenceCount = 42012-08-09 00:41:55.818 WonderPipeEffects1[18926:707] tick() -> RefferenceCount = 42012-08-09 00:41:55.820 WonderPipeEffects1[18926:707] draw() -> RefferenceCount = 42012-08-09 00:41:55.836 WonderPipeEffects1[18926:707] tick() -> RefferenceCount = 42012-08-09 00:41:55.839 WonderPipeEffects1[18926:707] draw() -> RefferenceCount = 42012-08-09 00:41:55.852 WonderPipeEffects1[18926:707] tick() -> RefferenceCount = 42012-08-09 00:41:55.856 WonderPipeEffects1[18926:707] draw() -> RefferenceCount = 42012-08-09 00:41:55.869 WonderPipeEffects1[18926:707] tick() -> RefferenceCount = 42012-08-09 00:41:55.872 WonderPipeEffects1[18926:707] draw() -> RefferenceCount = 42012-08-09 00:41:55.886 WonderPipeEffects1[18926:707] tick() -> RefferenceCount = 42012-08-09 00:41:55.889 WonderPipeEffects1[18926:707] draw() -> RefferenceCount = 42012-08-09 00:41:55.907 WonderPipeEffects1[18926:707] tick() -> RefferenceCount = 42012-08-09 00:41:55.911 WonderPipeEffects1[18926:707] draw() -> RefferenceCount = 42012-08-09 00:41:55.917 WonderPipeEffects1[18926:707] ccTouchesBegan()2012-08-09 00:41:55.921 WonderPipeEffects1[18926:707] init() -> 1.RefferenceCount = 12012-08-09 00:41:55.925 WonderPipeEffects1[18926:707] init() -> 2.RefferenceCount = 22012-08-09 00:41:55.928 WonderPipeEffects1[18926:707] tick() -> RefferenceCount = 32012-08-09 00:41:55.932 WonderPipeEffects1[18926:707] ReffenceCountLayer.dealloc!2012-08-09 00:41:55.936 WonderPipeEffects1[18926:707] draw() -> RefferenceCount = 42012-08-09 00:41:55.940 WonderPipeEffects1[18926:707] tick() -> RefferenceCount = 42012-08-09 00:41:55.944 WonderPipeEffects1[18926:707] draw() -> RefferenceCount = 42012-08-09 00:41:55.952 WonderPipeEffects1[18926:707] tick() -> RefferenceCount = 42012-08-09 00:41:55.954 WonderPipeEffects1[18926:707] draw() -> RefferenceCount = 42012-08-09 00:41:55.970 WonderPipeEffects1[18926:707] tick() -> RefferenceCount = 42012-08-09 00:41:55.980 WonderPipeEffects1[18926:707] draw() -> RefferenceCount = 4

测试结论如下：

init 方法里面调用 schedual 方法以后，RefferenceCountLayer 的引用计数会加1，这里没有问题~

但是到了 draw()、tick() 方法里面，引用计数竟然由 2 直接跳到 4!

我是百思不得其解，不过经过我的测试，发现引用计数虽然直接跳到 4 了，

但是在 replaceScene 的时候，依然能够看到 RefferenceCountLayer 的 dealloc 方法被调用了，

也就是说，该对象并不会因此而出现什么内存泄露的问题~

后面我思考了一下，引用计数由 2 跳到 4 肯定是在 cocos2d 框架内部安全的增长到 4 的，

这个不用我们去操心，没有内存泄露，我们知道这样一件事情就行了~

前面附的链接里面 cocos2d 作者之一 Riq 没有就此问题做较为仔细的回复，这是问题的来源，

不过也不能去责怪他什么，人的精力毕竟是有限的，他不可能就每个问题都做详细的回复，

凡事都往好的方面想，Riq 作为 cocos2d 的主要负责人之一，为我们提供了这么 nice 的东西，这样便行了~