PowenKo, Mac APP tutorial 001- begin hello world

http://developer.apple.com/library/ios/#documentation/IDEs/Conceptual/xcode_quick_start/010-Tutorial_Using_Xcode_to_Write_Hello_World/hello_world_tutorial.html

//
//  HelloView.m
//  Hello
//
//  Created by JON MOODY on 11/15/11.
//  Copyright 2011 __MyCompanyName__. All rights reserved.
//

#import "HelloView.h"

@implementation HelloView

- (id)initWithFrame:(NSRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code here.
    }
    
    return self;
}

- (void)drawRect:(NSRect)dirtyRect
{
    // Drawing code here.
    NSString * t_string=@"Hi! this is HelloView";
    NSPoint point=NSMakePoint(100,100);
    NSMutableDictionary*  t_font_attributes=[[NSMutableDictionary alloc] init];
    NSFont *t_font=[NSFont fontWithName:@"Futura-MediumItalic" size:42];
    [t_font_attributes setObject:t_font forKey:NSFontAttributeName];
    
    [t_string drawAtPoint:point withAttributes:t_font_attributes];
    
    
    
}

@end

sample code:
001-Begin-Hello