Mac OS Cocoa:在画布上绘制一个简单的像素

#import <Cocoa/Cocoa.h>

@interface MyView : NSView
@end

@implementation MyView

- (void)drawRect:(NSRect)dirtyRect {
    [[NSColor blackColor] setFill];
    NSRectFill(dirtyRect);
    
    NSRect pixelRect = NSMakeRect(50, 50, 1, 1);
    [[NSColor whiteColor] setFill];
    NSRectFill(pixelRect);
}

@end

int main(int argc, const char * argv[]) {
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    NSApplication *application = [NSApplication sharedApplication];
    
    NSRect frame = NSMakeRect(0, 0, 200, 200);
    MyView *view = [[MyView alloc] initWithFrame:frame];
    
    NSWindow *window = [[NSWindow alloc] initWithContentRect:frame
                                                   styleMask:NSWindowStyleMaskTitled
                                                     backing:NSBackingStoreBuffered
                                                       defer:NO];
    [window setContentView:view];
    [window makeKeyAndOrderFront:nil];
    
    [application run];
    
    [pool drain];
    return 0;
}