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    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillShown:)
                                                 name:UIKeyboardWillShowNotification
                                               object:nil];
    
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillHide:)
                                                 name:UIKeyboardWillHideNotification
                                               object:nil];}

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Just a snippet.

Note: Don’t push or remove view controllers with non-opaque views. The underlying view of the parent view controller is removed.

[CATransaction begin];

CATransition *transition = [CATransition animation];
transition.type = kCATransitionFade;
transition.duration = animated ? 0.5f : 0.0f;
transition.fillMode = kCAFillModeForwards;

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dispatch_queue_t callerQueue = dispatch_get_current_queue();
dispatch_retain(callerQueue);

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
	
	// Do the work in the other thread...
	// Example: NSArray* items = parseJSON(data);
	
	dispatch_async(callerQueue, ^{
		

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test

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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]);

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

@property (nonatomic, copy) NSString *xmlFileName;

- (BOOL) updateFile;

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