Comments on: Which OS Version to Target?

By: drops

drops — Fri, 10 Jul 2009 09:30:34 +0000

Wow, that’s amazing. I finally see how it can be possible to achieve that Tap Tap Revenge is doing!

I have to work up a recipe once I can find time to make an example.

By: dzamir

dzamir — Fri, 10 Jul 2009 09:11:59 +0000

https://devforums.apple.com/message/92251

http://www.clarkcox.com/blog/2009/06/23/sdks-and-deployment-targets/

By: dzamir

dzamir — Fri, 10 Jul 2009 09:06:18 +0000

You use the 3.0 sdk and build against 2.2.
I can swear you that it works
If you search the apple dev forums, you can find answer from apple engineers that recommend this way.

By: drops

drops — Fri, 10 Jul 2009 08:38:44 +0000

But how would you load 3.0 frameworks on 2.0 builds? To use a framework you need to include the headers and those reject to be loaded on pre 3.0, unless you hack them…

By: dzamir

dzamir — Fri, 10 Jul 2009 08:36:16 +0000

It’s not a magic function to run 3.0 feature on a 2.0 build. There are 2 way to the “magic”:
1) check the firmware version:
+(int) iPhoneOSMajorVersion {
if (majorVersion == 0) {
NSString * version = [[UIDevice currentDevice] systemVersion];
majorVersion = [[version substringToIndex:1] intValue];
}
return majorVersion;
}

+(BOOL) isIPhoneOS3 {
return [self iPhoneOSMajorVersion] >= 3;
}

if ([xxx isIPhoneOs3]) {
// iphone 3.0 stuffs.
} else {
// iphone 2.0 stuffs
}

2) check if the current firmware implements the selector you need to call:

if ([obj respondsToSelector:@selector(selnameThatWorksOnlyIn3)]) {
[obj selnameThatWorksOnlyIn3];
} else {
[obj oldSelectorThatWorksOn2];
}

The last method is the best method, because it’s always better to check if the selector exists (things can change from firmware to firmware), but it’s better if you save the result of respondsToSelector in a global BOOL so you can easily check later if the selector exists without calling the method every time

By: Andreas Heck

Andreas Heck — Fri, 10 Jul 2009 05:43:36 +0000

Good Morning, Oliver!
You’ve published great stats and you’re asking a clever question. I can answer with our own stats, collected within the highscore of our Super Trumps games:
http://iphone.derheckser.com/2009/07/10/what-shall-we-do-for-3-0/

By: wuf810

wuf810 — Fri, 10 Jul 2009 01:05:15 +0000

http://www.iphonedevsdk.com/forum/iphone-sdk-development-iphone-os-3-0/22725-stats-3-0-users.html#post101510