How to show a view in this way on Cocoa Desktop?

Question

I'm doing an app and I was wondering how can you show a view like this:

Answer 1

That would be called a sheet. This guide should walk you through how to do them.

You basically make a NSWindow that you would like to use as a sheet, then, when you want to show it, call:

[NSApp beginSheet: myCustomSheet modalForWindow: window modalDelegate: self didEndSelector: @selector(didEndSheet:returnCode:contextInfo:) contextInfo: nil];`

myCustomSheet is obviously your sheet and window is the window you want it to appear in. Set self as the delegate and implement didEndSheet:returnCode:contextInfo::

- (void)didEndSheet:(NSWindow *)sheet returnCode:(NSInteger)returnCode contextInfo:(void *)contextInfo
{
    [sheet orderOut:self];
}

Hook up a "close" button on your sheet to an IBAction that closes the sheet.

- (IBAction)closeMyCustomSheet: (id)sender
{
    [NSApp endSheet:myCustomSheet];
}

These sheets don't even need to be folded! XD