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[things we take for granted] How come new iOSes have no backward compatibility troubl
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Addicted to MacNN
Join Date: Dec 1999
Location: Tampa, Florida
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Even the oldest, crappiest apps keep working, whereas in the OSX context, applications made in 2008 may or may not not run on Snow Leopard.
Insane backward compatibility testing of current code?
Inclusion of old libraries and kernel modules, leading to bloat?
iOS design inherently doesn't get compatibility problems?
UNIX jail? Chroot? Emulation? Sandboxing?
Accident? Steve's voodoo?
Is this gravy train gonna stop? Hit a wall?
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Posting Junkie
Join Date: Jan 2006
Location: Seattle, Washington
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iOS hasn't been completely rewritten from the ground up since 2008 like OS X has. Apart from a few thousand new APIs, the iOS that ships today on a new iPhone is the same iOS that shipped on the first iPhone in 2007.
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Addicted to MacNN
Join Date: Aug 2004
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Private API use is not allowed.
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Mac Elite
Join Date: Jan 2000
Location: Columbus, OH
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Given enough time, some apps will fail as APIs become deprecated. After a few major iOS updates, the developer will have to update their app otherwise the app will fail. iOS hasn't been around long enough for this to become a problem.
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HyperNova Software, LLC
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Professional Poster
Join Date: Jun 2001
Location: Northwest Ohio
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Originally Posted by TETENAL 
Private API use is not allowed.
This.
Even back in the old days of Classic Mac OS (and even in the days of the Apple II), the biggest reason that apps would break in new releases of the operating system was apps that did things that Apple explicitly told developers not to do. The problem was that Apple didn't even follow its own advice and even their own apps would trip up because of it.
That's not to say that all apps that follow all the rules won't ever have backwards-compatibility problems, but the percentage that do is much smaller.
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Professional Poster
Join Date: Jun 2001
Location: Northwest Ohio
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Originally Posted by msuper69
Given enough time, some apps will fail as APIs become deprecated. After a few major iOS updates, the developer will have to update their app otherwise the app will fail. iOS hasn't been around long enough for this to become a problem.
Also, I imagine that Apple can remove old, never updated apps from the store once they become so old that they wouldn't run on current versions of the iOS and the percentage of older versions that can run the app drops to a minuscule number.
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