compatibility ios4 features

[catnic s.r.l.]

I am writing an application which uses MFMessageComposeViewController which is a ios4.0 feature which allows to send SMS.
This feature was not available in ios 3.x.

On ios4 it works ok. What happens if I install the app on a 3.x device?

If it does not work is it possible to detect if the feature is available and eventually disable the button to send the sms on 3.x devices?

More in general.... if I use 4.x features and then i set "IOS development target" to 3.1 for example what happens to theese unsupported features?

Thanks,
Massimo

[axiom]

Not sure if this helps but I recently came across a post regarding backwards compatibility of MPMoviePlayerController. See post at link below. Hope it helps:

Developing iPhone Apps with iOS4 SDK, Deploying to 3.x Devices : Base SDK and iPhone OS Deployment Target

[Kalimba]

Originally Posted by catnic s.r.l.

More in general.... if I use 4.x features and then i set "IOS development target" to 3.1 for example what happens to theese unsupported features?

At best, they just won't work on a device with pre-4.x iOS. At worst, attempting to use them will cause your application to crash. Search around for ways to add run-time checks for backwards compatibility.

[catnic s.r.l.]

Hi Axiom,

it's a good reference! It can help me much.
Thanks a lot

Originally Posted by axiom

Not sure if this helps but I recently came across a post regarding backwards compatibility of MPMoviePlayerController. See post at link below. Hope it helps:

Developing iPhone Apps with iOS4 SDK, Deploying to 3.x Devices : Base SDK and iPhone OS Deployment Target

[catnic s.r.l.]

This works...

bool sms_capable = NO;
if (NSClassFromString(@"MFMessageComposeViewController") != nil) {
  if ([NSClassFromString(@"MFMessageComposeViewController") canSendText]) {
				sms_capable = YES;
		    }
		}