Minecraft pocket edition keeps crashing

I have minecraft pocket edition on my iPhone and whenever I try to launch the app it goes to the "Mojang" screen for about second then crashes and sends me back to my home screen. I have tried turning it off and on and still doesn't work. I don't want to delete it because I have a lot of good worlds on there. Anyone know how I could fix this?

Why would you ever play Minecraft on an iPhone?

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