quick ref Xcode

Set a Label

    [BallenLAbel setText:@"sdfsdf"];

myLabel.text=[NSString stringWithFormat:@"x = %f",startPoint.x];

- (void)drawRect:(CGRect)rect {

    // Drawing code

    

//Make a simple rectangle and fill background BLUE with half Opeque

CGContextRef context = UIGraphicsGetCurrentContext();

//[[UIColor blueColor] set];

CGContextSetRGBFillColor(context, 0.0, 0.0, 1.0, 0.5);

rect = CGRectMake(20, 20, 40, 40);

CGContextFillRect(context, rect); 

    

//Make a simple RED line from 0,0 to 100, 100 in a FRAME

//CGContextSetRGBFillColor(context, 1.0, 0.0, 0.0, 1.0);

[[UIColor redColor] set];

CGContextMoveToPoint(context, 0, 0);

CGContextAddLineToPoint( context, 100,100);

CGContextStrokePath(context);

}

Create an instance
MyClass *foo;
foo = [[MyClass alloc] init];

Destroy an instance
[foo release];

Info to screen
NSLog(@"Write some comment");
// C string char *foo;
// NSString NSString *bar;
foo = "this is a C string";
bar = @"this is an NSString";
printf(foo);

MyClass.
#import 
@interface myClass : NSObject 
@end

MyClass.m
@implementation myClass
@end import

import
#import voor NSLog, NSObject, NSWindow