cocos2d 问题 - 图层更新速度不够快

Question

我正在向 cocos2d 层添加叠加层以准备屏幕截图...

CGSize winSize = [[CCDirector sharedDirector] winSize];

CCScene* currentScene = [[CCDirector sharedDirector] runningScene];

 GameLayer* topLayer = (GameLayer *)[currentScene.children objectAtIndex:0];

 CCSprite *middleBackground = [CCSprite spriteWithFile:@"mid_bg.png"];
 middleBackground.position = ccp(winSize.width * 0.5,winSize.height * 0.55);
 [topLayer addChild:middleBackground z:3 tag:111];

 CCSprite *bottomBackground = [CCSprite spriteWithFile:@"bot_bg.png"];
 bottomBackground.position = ccp(winSize.width * 0.5,winSize.height * 0.1);
 [topLayer addChild:bottomBackground z:3 tag:112];

 CCSprite *topBackground = [CCSprite spriteWithFile:@"top_bg.png"];
 topBackground.position = ccp(winSize.width * 0.5,winSize.height * 0.94);
 [topLayer addChild:topBackground z:3 tag:113];

 [[UIApplication sharedApplication] setStatusBarHidden:YES];

 CCSprite *topBackground2 = [CCSprite spriteWithFile:@"statusCover2.png"];
 topBackground2.position = ccp(winSize.width * 0.5,winSize.height * 0.992);
 [topLayer addChild:topBackground2 z:3 tag:114];

 [[topLayer popoverController] dismissPopoverAnimated:YES];

然后

[UIImage imageWithCGImage:UIGetScreenImage()];

但是后者没有考虑叠加层。它在添加叠加层之前截取图层的屏幕截图。

无论如何，我可以告诉 cocos2d 场景/图层现在更新框架吗？

Answer 1

因为 cocos2d 是异步的，所以你不能告诉它做类似的事情。但是，您可以安排回调在两秒内发生，并让该回调执行屏幕捕获。

[self schedule: @selector(screenshot:) interval:2.0];

然后像这样定义选择器：

-(void) screenshot:(id)sender {
  [UIImage imageWithCGImage:UIGetScreenImage()];
  [self unschedule:@selector(screenshot:)];
}

不要忘记取消安排它。