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64-bit and iOS 8 Requirements for New Apps

developer.apple.com

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Re: 64-bit and iOS 8 Requirements for New Apps

#6

Post by dozy »

wvenable wrote: post #2

Does this mean no new iOS apps for those people who choose not to upgrade to iOS 8?

No - it just means new iOS apps must support 64-bit and be built with Xcode 6. Those same binaries/archives can also support 32-bit and older OS versions.

Similarly, today, you must build your app using at least the iOS 7 SDK and xcode 5, but that does not prevent you from supporting iOS 6 as well.

Re: 64-bit and iOS 8 Requirements for New Apps

#7

Post by wvenable »

reverend_gonzo wrote: post #5
wvenable wrote: post #2

Does this mean no new iOS apps for those people who choose not to upgrade to iOS 8?

Did you read the link? New apps must include 64-bit support. That's it. It says nothing about not allow backwards compatibility as well.

I read the link, I was focusing on the "built with the iOS 8 SDK" part. I'm asking the question whether or not building with the iOS 8 SDK would preclude that code from running on iOS 7 or is that only if that code uses iOS 8 features.

I'm not sure why this is news otherwise.

Re: 64-bit and iOS 8 Requirements for New Apps

#8

Post by joesmo »

reverend_gonzo wrote: post #5
wvenable wrote: post #2

Does this mean no new iOS apps for those people who choose not to upgrade to iOS 8?

Did you read the link? New apps must include 64-bit support. That's it. It says nothing about not allow backwards compatibility as well.

They must be built with the iOS 8 SDK so unless that runs on previous versions of iOS, then new apps for previous iOS versions will not be supported.

Re: 64-bit and iOS 8 Requirements for New Apps

#9

Post by wvenable »

dozy wrote: post #6
wvenable wrote: post #2

Does this mean no new iOS apps for those people who choose not to upgrade to iOS 8?

No - it just means new iOS apps must support 64-bit and be built with Xcode 6. Those same binaries/archives can also support 32-bit and older OS versions. Similarly, today, you must build your app using at least the iOS 7 SDK and xcode 5, but that does not prevent you from supporting iOS 6 as well.

Thanks for the reply. I'm not that familiar with iOS development but have a jailbroken iPhone on iOS 7.

Re: 64-bit and iOS 8 Requirements for New Apps

#10

Post by Osmium »

wvenable wrote: post #7
reverend_gonzo wrote: post #5

Earlier quoted context omitted.

Did you read the link? New apps must include 64-bit support. That's it. It says nothing about not allow backwards compatibility as well.

I read the link, I was focusing on the "built with the iOS 8 SDK" part. I'm asking the question whether or not building with the iOS 8 SDK would preclude that code from running on iOS 7 or is that only if that code uses iOS 8 features. I'm not sure why this is news otherwise.

> I'm not sure why this is news otherwise.

One reason is that, I believe, currently if even a single 32-bit app is loaded on a newer iOS device, all the standard 32-bit libraries have to be loaded into memory as well which causes increased memory pressure. This is a problem given that current iOS devices only have 1 GB of RAM. Getting older apps migrated to 64-bit is therefore a big deal for this reason alone.

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