You can use the canSendText class method for doing this:
- (IBAction)Message:(id)sender
{
if ([MFMessageComposeViewController canSendText])
{
MFMessageComposeViewController *messaging=[[MFMessageComposeViewController alloc]init];
messaging.messageComposeDelegate=self;
[messaging setBody:@"Will of the People""\n""http://bit.ly/1gZhZye"];
[self presentViewController:messaging animated:YES completion:nil];
}
}
Reference :
canSendText
Returns a Boolean value indicating whether the current device is capable of sending text messages.
+ (BOOL)canSendText
Return Value
YES if the device can send text messages or NO if it cannot. Discussion
Always call this method before attempting to present the message compose view controller. A device may be unable to send messages if it does not support messaging or if it is not currently configured to send messages. This method applies only to the ability to send text messages via iMessage, SMS, and MMS.
To be notified of changes in the availability of sending text messages, register as an observer of the MFMessageComposeViewControllerTextMessageAvailabilityDidChangeNotification notification. Availability
Available in iOS 4.0 and later.
Declared In MFMessageComposeViewController.h