Question

When a popover is displaying how can I make its size variable depending on condition check? Is this functionality supported or not when working with a popover?

Here is my sample for changing frame size:

CGFloat newHeight = 200;
NSRect newFrame  = [parentView frame];
newFrame.size.height = newHeight;

NSView* childView = someView;

[parentView setFrame:newFrame];
[self.view addSubview:childView];

Answer 1

You need to change the popupwindow.contentViewController property of the NSPopover to a new NSViewController with a different-sized view.
That is, resizing the view’s frame will only result in weird drawing problems. To get the popover window to change size, the contentViewController must be changed.

Ideally, you would set up a new view controller which is essentially a copy of your existing NSViewController, but containing a view that is taller/shorter. But in the worst-case scenario, you can do something like this:

gPopoverWindow.contentViewController = [[[NSViewController alloc] initWithNibName: @"tempNibName" bundle: nil] autorelease];
NSView *v = self.view;
NSRect b = [v frame];
b.size.height += 25;
[v setFrame: b];
gPopoverWindow.contentViewController = self;

In my testing, this resulted in the popover beginning a shrink animation (because of being set to the temp view controller), then growing to its new size.