Director setContentScaleFactor 在iPad上分辨率显示不正常

Cocos2d-x
#1

cocos2d-x v3.2, xcode6 beta 5,在iphone(ios8(和另一个安卓收集上，图片和字体的缩放正常，但是在ipad上(ios7)缩放不正常，似乎保留了图片的原始比例，代码如下：

Size designSize(640,1136);

Size realSize=glview->getFrameSize();

float contentScalefactor=realSize.height/designSize.height;

designSize.width=realSize.width*designSize.height/realSize.height;

glview->setDesignResolutionSize(designSize.width,1136,ResolutionPolicy::SHOW_ALL);

director->setContentScaleFactor(contentScalefactor);


哪位大侠遇到过类似问题，怎么解决的？