- (void)viewDidLoad {
 [super viewDidLoad];

 // Jailbreak Detection

 NSString *cydiaFilePath = @"/Applications/Cydia.app";

 if ([[NSFileManager defaultManager] fileExistsAtPath:cydiaFilePath])
 {
     // insert jailbreak code here...

     UIAlertView *jailbreakDetection = [[UIAlertView alloc]
                                        initWithTitle:@"Jailbreak Detected"
                                        message:@"This application will not run while a jailbreak is installed."
                                        delegate:nil
                                        cancelButtonTitle:nil
                                        otherButtonTitles:nil];

     [jailbreakDetection show];
 } }

UIAlertView *jailbreakDetection = [[UIAlertView alloc]
                                        initWithTitle:@"Jailbreak Detected"
                                              message:@"This application will not run while a jailbreak is installed."
                                             delegate:nil
                                    cancelButtonTitle:@"Close"
                                    otherButtonTitles:nil];