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Ok so my old apps which were written for the 3.5in and 4in iphone screens are downloaded on the and iphone with an 4.7/5.5in they seem to upscale and run perfectly fine with everything where it's suppose to be on the screen. So now I'm writing a new app just for the 4in screens because my thinking is that it will upscale when ran on 4.7/5.5in screen but this doesn't seem to be the case.

When I run my new app on a device with a 4.7/5.5in screen there is no upscaling. Why is this so? is there any setting to force the iphone to perform the upscaling or do I have to actually tune everything for 4.7/5.5in screens?

UPDATE: Ok I figured it out. To get your apps designed for the 4in screen to zoom in/upscale to fit the 4.7/5.5in screens you have delete the LaunchScreen.storyboard file from your project and add the Default-568@2x file.

RickyTheCoder
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  • There is something called auto layout, check it out. Can you show us some code? Or at least explain some **specific** issue you are having? (A `UIImage`? `CALayer`? Anything?) –  Aug 16 '17 at 23:59
  • This may be a duplicate of https://stackoverflow.com/questions/25754942/how-to-enable-native-resolution-for-apps-on-iphone-6-and-6-plus but I can't be sure with so little information. – rmaddy Aug 17 '17 at 00:04
  • tell me if this is your case.. old app use to zoom to fit the screen.. and newone doesnt? – Marcio Romero Patrnogic Aug 17 '17 at 00:12
  • @MarcioRomeroPatrnogic, Yup that's it. I think I figure it out though. I needed to add an launch screen with the "568@2x" name to force the new apps to zoom in. – RickyTheCoder Aug 17 '17 at 00:17

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iOS apps detect the screen size using the launch screen. The made the OS zoom out the app in order to support older apps. If you want to let the app take full usage of the screen resolution you should use a LaunScreen storyboard or provide the assets for all the screen sizes. If this assets are not found and you use the asset catalog for the splash screen you will get the zoom to fit larger screens

Marcio Romero Patrnogic
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