Simple Mac application

gistfile1.m

/*
 * A very basic Cocoa application.
 *
 * Save as "main.m" and compile in Terminal.app with:
 *   clang -o test main.m -framework AppKit -fobj-c-arc
 */
#import <AppKit/AppKit.h>

@interface TestView : NSView <NSWindowDelegate>
- (void)drawRect:(NSRect)rect;
@end

@implementation TestView
- (void)drawRect:(NSRect)rect
{
    [[NSColor blueColor] set];
    NSRectFill([self bounds]);
}
- (void)windowWillClose:(NSNotification*)notification
{
    [[NSApplication sharedApplication] terminate:self];
}
@end

int main(int argc, char *argv[])
{
    NSApplication *NSApp = [NSApplication sharedApplication];
    NSRect frame = NSMakeRect(100.0, 100.0, 320.0, 240.0);
    
    NSWindow *window = [[NSWindow alloc]
                        initWithContentRect:frame
                        styleMask:NSTitledWindowMask | NSClosableWindowMask | NSMiniaturizableWindowMask | NSResizableWindowMask
                        backing:NSBackingStoreBuffered
                        defer:NO];

    [window setTitle:@"Testing"];
    
    TestView *view = [[TestView alloc] initWithFrame:frame];
    [window setContentView:view];
    [window setDelegate:view];
    [window makeKeyAndOrderFront:nil];
    
    [NSApp run];
    
    return EXIT_SUCCESS;
}