ios6上cocos2d截屏失效有关问题处理

ios6下cocos2d截屏失效问题处理

相信使用cocos2d官方论坛提供的截屏方法，或者其他使用openGL方式截屏的同志们，会发现在iOS6系统的真机上截图为全黑色，但是在其他版本系统的真机上没问题，而且在模拟器上也没问题，包括iOS6的模拟器。网上狂搜了一把，解决方案如下：

第一种：设置GLView的preserveBackbuffer属性值为YES：

在AppDelegate.m文件中找到：

	EAGLView *glView = [EAGLView viewWithFrame:[window bounds]
								   pixelFormat:kEAGLColorFormatRGB565	// kEAGLColorFormatRGBA8
								   depthFormat:0						// GL_DEPTH_COMPONENT16_OES
						];

将其修改为：

	EAGLView *glView = [EAGLView viewWithFrame:[window bounds]
								   pixelFormat:kEAGLColorFormatRGB565	// kEAGLColorFormatRGBA8
								   depthFormat:0						// GL_DEPTH_COMPONENT16_OES
								   preserveBackbuffer:YES 
								   sharegroup:nil 
								   multiSampling:NO 
								   numberOfSamples:0 
						];

第二种：使用以下一种截屏函数：

+(UIImage*) makeaShot
{
    [CCDirector sharedDirector].nextDeltaTimeZero = YES;
    CGSize winSize = [CCDirector sharedDirector].winSize;
    CCLayerColor* whitePage = [CCLayerColor layerWithColor:ccc4(255, 255, 255, 0) width:winSize.width height:winSize.height];
    whitePage.position = ccp(winSize.width/2, winSize.height/2);
    CCRenderTexture* rtx = [CCRenderTexture renderTextureWithWidth:winSize.width height:winSize.height];
    [rtx begin];
    [whitePage visit];
    [[[CCDirector sharedDirector] runningScene] visit];
    [rtx end];
    return [rtx getUIImageFromBuffer];
}

-(UIImage*) screenshotWithStartNode:(CCNode*)startNode
{
    [CCDirector sharedDirector].nextDeltaTimeZero = YES;
    CGSize winSize = [CCDirector sharedDirector].winSize;
    CCRenderTexture* rtx = 
    [CCRenderTexture renderTextureWithWidth:winSize.width 
                                 height:winSize.height];
    [rtx begin];
    [startNode visit];
    [rtx end];
    return [rtx getUIImage];
}

CCScene *scene = [[CCDirector sharedDirector] runningScene];
CCNode *n = [scene.children objectAtIndex:0];
UIImage *img = [self screenshotWithStartNode:n];

参考链接：

http://www.cocos2d-iphone.org/forum/topic/40858

http://www.cocos2d-iphone.org/forum/topic/1722/page/4

http://*.com/questions/12413460/cocos2d-2-0-screenshots-on-ios-6

http://bentrengrove.com/blog/2012/10/23/taking-screenshots-in-cocos2d-on-ios6

http://www.cocos2d-iphone.org/forum/topic/37809

ios6上cocos2d截屏失效有关问题处理

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