What types/sizes of images do you need when using UIImage full screen?

Question

I'm targeting iOS8 to release an application. So it'll be available on 4S, 5's, 6, 6+, and iPad 2+.

I have a ViewController where, I present a UIImageView that is the entire size of my UIViewController's View.

My question is... what sizes do I need the image in. Am I going to need it in a special size for each device? Or does the 4s/5/6 all use the same ratios for example, while the 6+ has its own unique ratio? Or do I just use 1 image size and let it auto scale it (or will that stretch/skew the image)?

Also, what's the minimal size the image should be? If it's smaller than the native size of the iPhone 6+ for example, won't the quality of the image deteriorate?

Answer 1

you need special size for each device by using image.xcassets.And this will help you alot - https://developer.apple.com/library/ios/documentation/UserExperience/Conceptual/MobileHIG/IconMatrix.html

Answer 2

The image in Imageview in 4s/5/6 devices render at @2x while that in 6+ it renders at @3x.So take an image and name it as [email protected] and other image for 6+ having higher resolution , name it as [email protected] When the image is placed in imageview , It will automatically takes [email protected] for 4s/5/6 and [email protected] for 6+.

Answer 3

In iOS8, you can use different size classes for different screens

use this post to begin.

Also refer this for more info about using different graphics for varying resolution.