如何在启动时以编程方式强制iPad进入1x或2x模式？

Question

I can detect my iPad device running an iPhone app in 1x or 2x scale, thanks to an earlier post here: detect iPad 2x button for iPhone app

What I would like to do is to serialise this setting into NSUserDefaults when it is changed by the user so that force the app into 1x or 2x at startup. Currently the app always starts in 1x mode. Please note again I can detect when the user switches scale between 1x and 2x, my problem is to set the scale programmatically at startup.

It seems [[UIScreen mainScreen] screen] is read-only. However I know that some apps such as Google+ is capable of doing this. But how?

Answer 1

For me, iOS seems to remember the "2x" setting for my apps. Perhaps it gets reset when debugging through Xcode. I would test with a release build and run it normally outside the debugger.