Access iPad launch images programmatically?

I'm using LaunchImage.launchimage in Images.xcassets to manage the launch images. But I'm trying to use the launch images inside the app also.

I've read this answer :

The documentation indicates that the imageNamed: method on UIImage should auto-magically select the correct version

So, I used this code

UIImageView *backImage = [UIImageView new];
backImage.image = [UIImage imageNamed:@"LaunchImage"];

When working on iPhone 4,5,6,6+ it works perfectly fine and get the correct LaunchImage, but when working on iPad retina it returns LaunchImage-700@2x.png which is the LaunchImage of iPhone 4s 640 x 960 pixels

So how can I access the correct LaunchImage of iPad programatically ??

The contents of Contents.json in LaunchImage folder

{
  "images" : [
    {
      "extent" : "full-screen",
      "idiom" : "iphone",
      "subtype" : "736h",
      "filename" : "LaunchImage-800-Portrait-736h@3x.png",
      "minimum-system-version" : "8.0",
      "orientation" : "portrait",
      "scale" : "3x"
    },
    {
      "extent" : "full-screen",
      "idiom" : "iphone",
      "subtype" : "667h",
      "filename" : "LaunchImage-800-667h@2x.png",
      "minimum-system-version" : "8.0",
      "orientation" : "portrait",
      "scale" : "2x"
    },
    {
      "orientation" : "portrait",
      "idiom" : "iphone",
      "extent" : "full-screen",
      "minimum-system-version" : "7.0",
      "filename" : "LaunchImage-700@2x.png",
      "scale" : "2x"
    },
    {
      "extent" : "full-screen",
      "idiom" : "iphone",
      "subtype" : "retina4",
      "filename" : "LaunchImage-700-568h@2x.png",
      "minimum-system-version" : "7.0",
      "orientation" : "portrait",
      "scale" : "2x"
    },
    {
      "orientation" : "portrait",
      "idiom" : "ipad",
      "extent" : "full-screen",
      "minimum-system-version" : "7.0",
      "filename" : "LaunchImage-700-Portrait~ipad.png",
      "scale" : "1x"
    },
    {
      "orientation" : "landscape",
      "idiom" : "ipad",
      "extent" : "full-screen",
      "minimum-system-version" : "7.0",
      "filename" : "LaunchImage-700-Landscape~ipad.png",
      "scale" : "1x"
    },
    {
      "orientation" : "portrait",
      "idiom" : "ipad",
      "extent" : "full-screen",
      "minimum-system-version" : "7.0",
      "filename" : "LaunchImage-700-Portrait@2x~ipad.png",
      "scale" : "2x"
    },
    {
      "orientation" : "landscape",
      "idiom" : "ipad",
      "extent" : "full-screen",
      "minimum-system-version" : "7.0",
      "filename" : "LaunchImage-700-Landscape@2x~ipad.png",
      "scale" : "2x"
    },
    {
      "orientation" : "portrait",
      "idiom" : "iphone",
      "extent" : "full-screen",
      "filename" : "LaunchImage-700.png",
      "scale" : "1x"
    },
    {
      "orientation" : "portrait",
      "idiom" : "iphone",
      "extent" : "full-screen",
      "filename" : "LaunchImage-700@2x.png",
      "scale" : "2x"
    },
    {
      "orientation" : "portrait",
      "idiom" : "iphone",
      "extent" : "full-screen",
      "filename" : "LaunchImage-700-568h@2x.png",
      "subtype" : "retina4",
      "scale" : "2x"
    },
    {
      "orientation" : "portrait",
      "idiom" : "ipad",
      "extent" : "full-screen",
      "filename" : "LaunchImage-700-Portrait~ipad.png",
      "scale" : "1x"
    },
    {
      "orientation" : "landscape",
      "idiom" : "ipad",
      "extent" : "full-screen",
      "filename" : "LaunchImage-700-Landscape~ipad.png",
      "scale" : "1x"
    },
    {
      "orientation" : "portrait",
      "idiom" : "ipad",
      "extent" : "full-screen",
      "filename" : "LaunchImage-700-Portrait@2x~ipad.png",
      "scale" : "2x"
    },
    {
      "orientation" : "landscape",
      "idiom" : "ipad",
      "extent" : "full-screen",
      "filename" : "LaunchImage-700-Landscape@2x~ipad.png",
      "scale" : "2x"
    }
  ],
  "info" : {
    "version" : 1,
    "author" : "xcode"
  }
}

I've solved this issue using a long method

BOOL deviceIsIpad = NO;
if ( UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad ) {
    deviceIsIpad = YES;
}

if (!deviceIsIpad) {
    backImage.image = [UIImage imageNamed:@"LaunchImage"];
} else {
    UIInterfaceOrientation interfaceOrientation = self.interfaceOrientation;
    CGFloat screenScale = [[UIScreen mainScreen] scale];
    if (interfaceOrientation == UIDeviceOrientationPortrait || interfaceOrientation == UIDeviceOrientationPortraitUpsideDown){
        if (screenScale > 1) {
            backImage.image = [UIImage imageNamed:@"LaunchImage-700-Portrait@2x~ipad.png"];
        } else {
            backImage.image = [UIImage imageNamed:@"LaunchImage-700-Portrait~ipad.png"];
        }
    } else {
        if (screenScale > 1) {
            backImage.image = [UIImage imageNamed:@"LaunchImage-700-Landscape@2x~ipad.png"];
        } else {
            backImage.image = [UIImage imageNamed:@"LaunchImage-700-Landscape~ipad.png"];
        }
    }
}