How to target a specific iPhone version?

Question

I've got some code I want to only execute on the latest iPhone SDK (3.0), however I can't seem to figure out a way to target just 3.0 and ignore 2.2.1 etc. There is an ifdef statement, but it just seems to cover the entire iPhone:

#if TARGET_OS_IPHONE

Any help is appreciated.

Answer 1

It's in Xcode's build options. The drop down on the top left corner that says something like "myapp - 3.0 | Debug" Select the build you want and presto, your done.

Answer 2

Using the trick of adding OTHER_CFLAGS = "-g3 -save-temps -dD" from this answer, I found that the define __IPHONE_OS_VERSION_MIN_REQUIRED 20000 with a project targeted at 2.2.1. Perhaps that will work?

Answer 3

I'm fairly certain that the comment on the OP sums it up. You can't. Because a compile time directive cannot make a run-time decision. In Xcode, if you target 3.0, it won't run on a 2.2.1 phone. If you target 2.2.1, it won't compile because you have 3.0 specific code in there.

The only true solution would be two versions of your app, one of which is compiled for 3.0, and the other for 2.2.1.

Answer 4

My thought would be to test to see if a function exists that only exists on iPhone OS 3.0.

Answer 5

You can use this #define to change what you build for each SDK...

#if __IPHONE_OS_VERSION_MIN_REQUIRED > __IPHONE_2_2
// iPhone 3.0 code here
#endif

And do this at run-time to run code for 3.0 and above:

float version = [[[UIDevice currentDevice] systemVersion] floatValue];
if (version >= 3.0)
    {
    // iPhone 3.0 code here
    }

Answer 6

Well, my two cents:

How about building your app with the latest version say 3.0 so you can exploit all the new & cool APIs and specifying the Deployment Target as the least recent version you want to support so guys out there who didn't take time out to upgrade their devices will stil run your app. In this case as shown above you need to check for least recent version of the SDK and provide alternate functionality to make your application backward compatible.

Regards, Hardik

Answer 7

Im getting some odd behaviour after setting base sdk = iPhone device 2.2.1 and deployment target iphone os 3.1.2

This code OS_VERSION = [[[UIDevice currentDevice] systemVersion] floatValue]; NSLog(@"running version:%f", OS_VERSION); NSLog(@"minimum version:%f", __IPHONE_OS_VERSION_MIN_REQUIRED ); NSLog(@"2_2 version:%f", __IPHONE_2_2 );

prints

running version:3.100000 minimum version:3.099998 2_2 version:3.099998

on the simulator and

running version:3.100000 minimum version:0.000000 2_2 version:0.000000

on the device

and I dont have an iphone_os_2_2_1 define

suggestions welcomed.

Answer 8

Pretty sure you can also do:

#ifdef __IPHONE_3_0
// 3.0 code here
#endif