Question

有一种有效的方法吗？目前我使用

[renderTexture begin];
[self.view visit];
[renderTexture end];

但应用因此而紧张不安。

我读过我可以为此复制帧缓冲区的内容。真的吗？有人可以指导我如何做到这一点。

Answer 1

我使用了一种适合我的方法。它做了一个截图，然后选择它的一个框架。您可以更改它，因此它会从整个屏幕截取屏幕截图。这是代码。

-(UIImage*) takeScreenShot
{
[CCDirector sharedDirector].nextDeltaTimeZero = YES;
CGSize winSize = [CCDirector sharedDirector].winSize;

//aux layer to make screenshot
CCLayerColor* blankLayer = [CCLayerColor layerWithColor:ccc4(255, 255, 255, 0) width:winSize.width height:winSize.height];

blankLayer.position = ccp(winSize.width/2, winSize.height/2);

CCRenderTexture* rtx = [CCRenderTexture renderTextureWithWidth:winSize.width height:winSize.height];

//this part is the same as yours
[rtx begin];
[blankLayer visit];
[[[CCDirector sharedDirector] runningScene] visit];
[rtx end];


//this part makes a rectangle from the screenshot with size.width and 200 height. Change it

UIImage *tempImage =[rtx getUIImage];
CGRect imageBoundary = CGRectMake(0, 0, winSize.width, 200);
UIGraphicsBeginImageContext(imageBoundary.size);
CGContextRef context = UIGraphicsGetCurrentContext();

// translated rectangle for drawing sub image
CGRect drawRect = CGRectMake(-imageBoundary.origin.x, -imageBoundary.origin.y, tempImage.size.width, tempImage.size.height);

// clip to the bounds of the image context
CGContextClipToRect(context, CGRectMake(0, 0, imageBoundary.size.width, imageBoundary.size.height));

// draw image
[tempImage drawInRect:drawRect];
UIImage* subImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();


return subImage;

//and there you have an UIImage 


}

此代码在制作部分屏幕截图时效果很好。也许您可以尝试删除使用CGRect创建临时图像的代码部分。但我建议你改变这样的值：

CGRect imageBoundary = CGRectMake(0, 0, winSize.width, winSize.height);

所以它会制作完整的截图。

Answer 2

您可以使用“Kamcord”框架，使用此框架可以截取屏幕截图，还可以录制游戏视频，然后重播它们。

Answer 3

我用它。这是针对Cocos2d v3的。内存返回的需求微弱。因为它有一些问题。如果您将删除弱，则每次调用此方法时内存使用量都会增加。我认为这是最好的方法。

+(UIImage *)screenshot
{ 
    [CCDirector sharedDirector].view.alpha = 1.0;
    [CCDirector sharedDirector].nextDeltaTimeZero = YES;

    CGSize winSize = [[CCDirector sharedDirector] viewSize];
    CCRenderTexture* renTxture = [CCRenderTexture renderTextureWithWidth:winSize.width
                                                                  height:winSize.height
                                                             pixelFormat:CCTexturePixelFormat_RGB565];
    [renTxture begin];

    MainScene* tempScene = (MainScene *)[[CCDirector sharedDirector] runningScene];
    MainScene* __weak scene = tempScene;
    [scene visit];
    [renTxture end];

    UIImage *tempImage = [renTxture getUIImage];
    UIImage * __weak image = tempImage;

    return image;
}

拍摄ios cocos2d应用的快照

3 个答案: