Detect if a UIView has a Regular Width (Supports iOS 7). Sometimes its useful to run certain code depending on whether the device has a regular width.

UIView+HorizontalSizeClassInfo.swift

extension UIView {
    /// Returns a boolean indicating whether the view's width is currently in regular mode
    /// On iOS 7 this will return true when the device is an iPad and false on iPhone
    func isHorizontalSizeClassRegularWidth () -> Bool{
        if self.respondsToSelector("traitCollection") {
            return self.traitCollection.horizontalSizeClass == UIUserInterfaceSizeClass.Regular
        } else {
            return UIDevice.currentDevice().userInterfaceIdiom == UIUserInterfaceIdiom.Pad
        }
    }
}