Event processing when Mac NSWindow Size changes

1. First, register the notification function for event processing when the form size changes.

[Cpp]
[[Nsicationcenter center defacenter center] addObserver: window
Selector: @ selector (windowDidResize :)
Name: NSWindowDidResizeNotification
Object: self];

2. then adjust the frame of the view above the window in the defined processing function windowDidResize.
[Cpp]
-(Void) windowDidResize :( NSNotification *) aNotification
{
// Adjust the NSView frame on NSWindow
}

3. Implement the NSView function resizeSubviewsWithOldSize
When you modify the NSView fame in windowDidResize, this function is called.

[Cpp]
-(Void) resizeSubviewsWithOldSize :( NSSize) oldBoundsSize
{
// Adjust other controls on the NSView and the frame of the view as needed
}