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- (void)viewDidLoad {
  //find the UITextField view within searchBar (outlet to UISearchBar)
  //and assign self as delegate
  for (UIView *view in searchBar.subviews){
    if ([view isKindOfClass: [UITextField class]]) {
      UITextField *tf = (UITextField *)view;
      tf.delegate = self;
      break;
    }
  }

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- (UIImage *)scaleImage:(UIImage *)image toSize:(CGSize)newSize 
{
UIGraphicsBeginImageContextWithOptions(newSize, YES, 0.0);
CGRect imageRect = {{0.0, 0.0}, newSize}; 
[image drawInRect:imageRect]; 
UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext(); 
UIGraphicsEndImageContext(); 
return scaledImage;
}

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Singleton Objects
Lazy initialization is common
@implementation FooController 

// #1
+ (FooController *)sharedInstance
{
static dispatch_once_t once; 
static FooController *instance; 
dispatch_once(&once, ^{

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Nested invocations provide asynchronous callbacks
• Communication between subsystems

-(IBAction)onClick:(NSButton *)sender 
{ 
dispatch_async(account->queue, 
^{

NSImageRep *image = renderAccountStatement(account);
dispatch_async(dispatch_get_main_queue(),^{

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myView.layer.shadowOpacity = 0.8;
myView.layer.shadowRadius = 5.0;
myView.layer.shadowOffset = CGSizeZero;
myView.layer.shadowPath = [UIBezierPath bezierPathWithRect:myView.layer.bounds].CGPath;

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- (void)accelerometer:(UIAccelerometer*)accelerometer didAccelerate:(UIAcceleration*)acceleration{
    static float prevX=0, prevY=0;
    float accelX = acceleration.x * kFilterFactor + (1- kFilterFactor)*prevX;
    float accelY = acceleration.y * kFilterFactor + (1- kFilterFactor)*prevY;
    
    prevX = accelX;
    prevY = accelY;
    pitch = accelX;
}

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//
//  Lightning.h
//  Trundle
//
//  Created by Robert Blackwood on 12/1/09.
//  Copyright 2009 Mobile Bros. All rights reserved.
//

#import "cocos2d.h"

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#define NSLogFrame(description,aFrame) NSLog(@"%@ - {%0.0f:%0.0f}{%0.0f:%0.0f}", description, aFrame.origin.x, aFrame.origin.y, aFrame.size.width, aFrame.size.height);
#define NSLogPoint(description,aFrame) NSLog(@"%@ - {%0.0f:%0.0f}{%0.0f:%0.0f}", description, aFrame.origin.x, aFrame.origin.y, aFrame.size.width, aFrame.size.height);

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@interface LoaderURL : NSObject
{
    NSMutableData *responseData;
    NSURLConnection *connectionXML;
}

@property (nonatomic, copy) NSString *xmlFileName;

- (BOOL) updateFile;

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#define CMLog(format, ...) NSLog(@"%s:%@", __PRETTY_FUNCTION__,[NSString stringWithFormat:format, ## __VA_ARGS__]);


#define MARK	CMLog(@"%s", __PRETTY_FUNCTION__);


#define START_TIMER NSTimeInterval start = [NSDate timeIntervalSinceReferenceDate];
#define END_TIMER(msg) 	NSTimeInterval stop = [NSDate timeIntervalSinceReferenceDate]; CMLog([NSString stringWithFormat:@"%@ Time = %f", msg, stop-start]);