In which case one should use Popover segue in storyboard?

Question

I have few questions regarding Popover segue.

1) In what case one should use that?

2) In my case i have to show popover on button click and the popver having another view controller as shown in figure.1

3) If one having image as popover then how to hide the outer native blue popover? as shown in figure.2

4) What is the different in using Popover segue & using below code on button click

    classobj = [self.storyboard instantiateViewControllerWithIdentifier:@"identifier"];
    popOver = [[UIPopoverController alloc] initWithContentViewController:classobj];
    [popOver presentPopoverFromRect:CGRectMake(689,10,50,50) inView:self.view permittedArrowDirections:UIPopoverArrowDirectionUp animated:YES];

Answer 1

1) When you want to present a popover without having to write code as in example 4.

2) This is not a question

3) You can't simply drop in an image to use as a replacement for the popover's frame. You need to define a custom subclass of UIPopoverBackgroundView, as described in my answer here.

4) Your code has a set location and arrow direction, the segue will infer these for you based on the location in your VC. If you want further customisation, but still to use a segue, you can use prepareForSegue:.