adaptive-ui

I'm investigating the use of a storyboard for launch images for my app. The app has always used a large photo for the launch image, which is also used as the background for the first view. However the image is different when the app is launched in landscape on an iPad. So is there any way to differentiate between an iPad in portrait and an iPad in landscape when using a an Adaptive storyboard for a launch screen? Because it's a launch screen I can't run any code, it would have to be done completely through the storyboard. I found a solution using spacer views that position the correct image in

Here is a scenario what I needed. I have put a UIButton on IB (size iPhone4 inch) whose initial frame on IB is x:100,y:100,w:100,h:100 . I want the origins and height should change according to device size. for example the width and height of iPhone6 is 375X667, hence the width factor (375/320=1.1718) and height factor (667/568=1.1742) . In this scene I want to change my buttons origin X and width with multiply by width factor (1.1718) and origin Y and height with multiply by height factor (1.1782) . In this case my button should be shown on x:100X1.1718, y:100X1.1742, w:100X1.1718, h:100X1

I just watched the WWDC video #216, "Building Adaptive UI with UIKit." At about 45:10 Tony Ricciardi talks about changes to IB in Xcode 6 to support the new changes. He says "You can deploy these documents backwards to older versions of iOS". (where "These documents" presumably means XIBs and storyboards that have specific settings for different size classes.) I'm not making this up. Go watch the WWDC video. How is that possible? Trait collections and size classes are only defined in iOS 8. How can runtime behavior that's dependent on UI constructs that are new to iOS 8 work in previous iOS