Currently I am adjusting my already existing iOS App to iOS 8 and the iPhone 6. Currently the keyboard on the iPhone 6 seems pretty tall (like the WhatsApp app before the iP
It's not a coding issue. Your app is being rendered for the smaller screen sizes and then scaled up to fit the new larger screens (including the keyboard). You need to include launch images in the native resolutions for the iPhone 6 and 6 plus if you want it to render properly, but you will likely need to be using auto-layout if you want everything to grow to fit the new screen sizes and take advantage of the extra space.
For iPhone 6:
750 x 1334 (@2x) for portrait 1334 x 750 (@2x) for landscape
For iPhone 6 Plus:
1242 x 2208 (@3x) for portrait 2208 x 1242 (@3x) for landscape
or you can go through this link it may help you
http://matthewpalmer.net/blog/2014/09/10/iphone-6-plus-launch-image-adaptive-mode/