presentModalViewController:Animated is deprecated in ios6

Use this line & check:

[self presentViewController:imagePicker animated:YES completion:nil];

[[Picker presentingViewController] dismissViewControllerAnimated:YES completion:nil];

Instead of

 [[Picker parentViewControl] dismissModalViewControllerAnimated:YES];

and

[self presentViewController:picker animated:YES completion:nil];

Instead of

[self presentModalViewController:picker animated:YES];

if ([self respondsToSelector:@selector(presentViewController:animated:completion:)])
{
    [self presentViewController:objSignupViewController animated:^{} completion:nil];
}
else
{
    [self presentModalViewController:objSignupViewController animated:YES];
}