CodeDogg

//determin version

NSString *celltext = [[UIFont familyNames] objectAtIndex:

[indexPath row]];

if ([[[UIDevice currentDevice] systemVersion] hasPrefix:@"2."])

[cell setText:celltext];

else if ([[[UIDevice currentDevice] systemVersion] hasPrefix:@"3."])

[[cell textLabel] setText:celltext];

return cell;

// this too generates compile-time warnings about unimplemented selectors.

NSString *celltext = [[UIFont familyNames] objectAtIndex:

[indexPath row]];

if (![cell respondsToSelector:@selector(textLabel)])

[cell setText:celltext];

else

[[cell textLabel] setText:celltext];

return cell;

To avoid those compile-time warnings, you can add 3.x specific interface declarations to

your 2.x source.

@interface UITableViewCell (SDK3)

- (UILabel *) textLabel;

@end

A better approach, however, is to set the Base SDK and Deployment targets for your project.

In Target Info > Build Settings, set Base SDK to the highest version of the OS you

want to target, namely some 3.x version. Set the iPhone OS Deployment Target to the

lowest OS version you intend to build for.

You can also use a variety of other workarounds like pulling the label out indirectly.

This code retrieves the label and sets its text.

UILabel *label = (UILabel *)[cell valueForKey:@"textLabel"];

if (label) [label setText:celltext];

//Check if the class is available

Class MFMCVC = NSClassFromString(@"MFMailComposeViewController");

If (MFMVC) myMFMCViewController = [[MFMCVC alloc] init];