How to configure iOS app to work on specific devices?

问题

I am developing iOS app with ZBar SDK for QR-codes scan. Here ZBar SDK creators tell us that

Only the iPhone 3GS and iPhone 4 are supported, as they have a camera with auto-focus. The ZBar library does not support the iPhone 3G and is unlikely to ever support it.

So I have added auto-focus-camera key to the Required Device Capabilities section of my plist. All is great, except one thing - iPad 2 & iPod Touch 4th Gen doesn't have auto focus camera, but still are able to use my ZBar SDK code to scan QR-codes. But my auto-focus-camera key doen't allow users with iPad 2 and iPod Touch 4th Gen to download my app from App Store.

In other words I need to find a way to make my app installable via App Store on these devices:

iPhone 3GS.
iPhone 4.
iPhone 4S.
iPad 2.
The New iPad.
iPod Touch 4th Gen.

And on these devices my app should not be available:

iPhone 2G.
iPhone 3G.
iPad.
iPod Touch 3d Gen and

My question is: how to make my app available in App Store for first list devices' user and not available for second list devices' users?

Any help will be appreciated!

PS: I have seen this question on SO, but it doesn't help me much.

PS2: This app has the desired set of available devices.

Requirements: Compatible with iPhone 3GS, iPhone 4, iPhone 4S, iPod touch (4th generation), iPad 2 Wi-Fi, iPad 2 Wi-Fi + 3G, iPad (3rd generation) and iPad Wi-Fi + 4G.

Does anyone know, how they did it?

PS3: At the same time adding both still-camera and auto-focus-camera gives us this:

Requirements: Compatible with iPhone, iPod touch (4th generation), iPad 2 Wi-Fi, iPad 2 Wi-Fi + 3G, iPad (3rd generation) and iPad Wi-Fi + 4G.

And that is not a great way as long as we have all iPhones as suitable for our app, instead of 3GS, 4 and 4S.

PS4: My app is here and it has such requirements:

Requirements: Compatible with iPhone 3GS, iPhone 4, and iPhone 4S.

回答1:

Word Lens requires the armv7, opengles-2, and video-camera device capabilities.

回答2:

I'm not sure that you can do that

Maybe you can do a check in your code and if the device model is not the good one, just pop a new view saying that the model that the user is using can't make work the application ?

You can detect the model with this:

#import <sys/utsname.h>

NSString*
machineName()
{
   struct utsname systemInfo;
uname(&systemInfo);

return [NSString stringWithCString:systemInfo.machine
                          encoding:NSUTF8StringEncoding];
}

and give that:

@"i386"      on the simulator
@"iPod1,1"   on iPod Touch
@"iPod2,1"   on iPod Touch Second Generation
@"iPod3,1"   on iPod Touch Third Generation
@"iPod4,1"   on iPod Touch Fourth Generation
@"iPhone1,1" on iPhone
@"iPhone1,2" on iPhone 3G
@"iPhone2,1" on iPhone 3GS
@"iPad1,1"   on iPad
@"iPad2,1"   on iPad 2
@"iPhone3,1" on iPhone 4
@"iPhone4,1" on iPhone 4S

Else you can try sending an e-mail to apple