我在我的iPad应用程序中也遇到了这个问题，我找到了解决方法。

I was also getting this issue in my app for iPad and I found solution of this.

解决方案：我在我的应用中添加了 launchscreen.xib 并选择此文件在目标窗口中的常规部分的LaunchScreen部分。

Solution: I added a launchscreen.xib in my app and select this file in to LaunchScreen section of 'General' section in target window.

我没有添加iPad设备的启动图像，可能这是问题的原因。

I did not add launch images of iPad devices, may be this is the reason of issue.

所以现在这个问题已经解决了。 ：）

So now this issue has resolved. :)