NSView doesn't render OpenGL context

Hi ,

I have just written some code to start playing with opengl in cocoa. But it desnt works. Can you tell me why? I have just started coding in cocoa so dont know what is wrong. 😝

MyOpenglView.h :

#import <Cocoa/Cocoa.h>
@interface MyOpenglView : NSView
{
    NSOpenGLPixelFormat* format;
    NSOpenGLContext* context;

}
-(void)prepareOpenGl;
- (void)initGL;
-(void)update;
@end

And MyOpenglView.m :

#import "OpenglView.h"
#import <OpenGL/OpenGL.h>
#import <OpenGL/gl3.h>
@implementation MyOpenglView
- (void)initGL
{
    [context makeCurrentContext];
  
    /
    GLint one = 1;
    [ context setValues:&one forParameter:NSOpenGLCPSwapInterval];
}
-(id)initWithFrame:(NSRect)frame{
    NSOpenGLPixelFormatAttribute attribs[] =
    {
        NSOpenGLPFADoubleBuffer,
        NSOpenGLPFAAllowOfflineRenderers, /
        NSOpenGLPFAMultisample, 1,
        NSOpenGLPFASampleBuffers, 1,
        NSOpenGLPFASamples, 4,
        NSOpenGLPFAColorSize, 32,
        NSOpenGLPFAOpenGLProfile, NSOpenGLProfileVersion3_2Core, /
        0
    };
  
    NSOpenGLPixelFormat *pf = [[NSOpenGLPixelFormat alloc] initWithAttributes:attribs];
    if(!pf)
    {
        NSLog(@"Failed to create pixel format.");
        return nil;
    }
  
    self = [super initWithFrame:frame];
    if (self)
    {
        format = pf;
        context = [[NSOpenGLContext alloc] initWithFormat:format shareContext:nil];
      
    }
  
  
    return self;
}
-(void)prepareOpenGl{
    [self initGL];
  
      
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(surfaceNeedsUpdate:)
                                                 name:NSViewGlobalFrameDidChangeNotification
                                               object:self];
  
  
}
- (void)lockFocus
{
    [super lockFocus];
  
    if ([context view] != self)
    {
        [self prepareOpenGl];
      
        [context setView:self];
    }
}
- (void)update
{
        [context update];
  
    }
- (void)surfaceNeedsUpdate:(NSNotification *)notification
{
    [self update];
}
- (void)drawRect:(NSRect)dirtyRect {
    [context makeCurrentContext];
    glClearColor(1,0, 0, 1);
    glClear(GL_COLOR_BUFFER_BIT);
    glFlush();
    [context flushBuffer];
}
@end

Should it show red backgound?

  glClearColor(1,1, 0, 1);
    glClear(GL_COLOR_BUFFER_BIT);