NSPopover Example: Create and show a NSPopover programmatically when a user clicks a button in a subview

progamatically-popover-example.m

-(void) buttonClick:(NSButton *)sender {
    // Create view controller
    EXPopoverViewController *viewController = [[EXPopoverViewController alloc] init];
    
    // Create popover
    NSPopover *entryPopover = [[NSPopover alloc] init];
    [entryPopover setContentSize:NSMakeSize(200.0, 200.0)];
    [entryPopover setBehavior:NSPopoverBehaviorTransient];
    [entryPopover setAnimates:YES];
    [entryPopover setContentViewController:viewController];

    // Convert point to main window coordinates
    NSRect entryRect = [sender convertRect:sender.bounds
                                  toView:[[NSApp mainWindow] contentView]];
    
    // Show popover
    [entryPopover showRelativeToRect:entryRect
                              ofView:[[NSApp mainWindow] contentView]
                     preferredEdge:NSMinYEdge];
}