Qt 5.5 Apps in iOS Simulator rendered in half resolution

The iOS Simulator shows the screen at 100% in the correct resolution.
But the app renders everything double the size it should be. In other words, at half the resolution and scaled to the screen size. For example if you render a icon with 64x64 pixels and you make a screenshot in the simulator the picture is about 128x128 pixels.
QGuiApplication::primaryScreen()->availableGeometry() returns half of what would be correct.

I attached a example project and a screenshot of the example for iOS-Simulator and android.
The used iOS-Simulator device was iPhone 4s.
I do not know if this issue also effects real devices.
On my android device it works as expected(Screenshot attached).