In order to support iPhone OS 3.x and 4.0 I programmatically control MFMessageComposeViewController functionality like this (use it only if the OS version is 4.0 or above):
// if iPhone OS version >= 4.0
if (os_version_num >= 4) {
MFMessageComposeViewController *controller = [[MFMessageComposeViewController alloc] init];
if([MFMessageComposeViewController canSendText])
{
controller.body = text;
controller.recipients = [NSArray arrayWithObjects: nil];
controller.messageComposeDelegate = self;
[self presentModalViewController:controller animated:YES];
[controller release];
}
}
But, when I try to run it on iPhone 3.1.3 device, I immediately get the following error (even before application gets loaded):
dyld: Symbol not found: _OBJC_CLASS_$_MFMessageComposeViewController
Referenced from: /var/mobile/Applications/7232C474-FAD5-4E28-ABC5-8520F62300B0/TextMe.app/TextMe
Expected in: /System/Library/Frameworks/MessageUI.framework/MessageUI
Data Formatters temporarily unavailable, will re-try after a 'continue'. (Not safe to call dlopen at this time.)
What am I doing wrong?