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+ (CGPoint)getMostLeftTransparentPixelOfImage:(UIImage*)image
{
    
    int xx = 0;
    int yy = 0;
    int count = image.size.width * image.size.height;
    
    
    // First get the image into your data buffer
    CGImageRef imageRef = [image CGImage];

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//We need some properties
@property (nonatomic,strong) NSMutableArray *dataSource;
@property (nonatomic, strong) UITextField *currentTextField;
@property (nonatomic) CGRect originalTableFrame;
@property (nonatomic) NSIndexPath *indexForCurrentTextField;
@property (nonatomic) NSTimeInterval keyboardAnimationDuration;

//Don't forget to be delegate of UITextFieldDelegate

//Then...

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//
//  NSMutableArray+Stack.m
//  shell poc
//
//  Created by Jose Luis Campaña on 9/18/12.
//  Copyright (c) 2012 Jose Luis Campaña. All rights reserved.
//

#import "NSMutableArray+Stack.h"

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//
//  NSMutableArray+Stack.h
//  shell poc
//
//  Created by Jose Luis Campaña on 9/18/12.
//  Copyright (c) 2012 Jose Luis Campaña. All rights reserved.
//

#import <Foundation/Foundation.h>

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//  UIBarButtonItem+Image.m

@implementation UIBarButtonItem (Image)

-(id)initWithImage:(UIImage *)image title:(NSString*)title target:(id)target action:(SEL)action {
  UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
  button.frame= CGRectMake(0.0, 0.0, image.size.width, image.size.height);
  button.titleLabel.font = [UIFont boldSystemFontOfSize:12];
  button.titleLabel.shadowOffset = CGSizeMake(0, -1);
  button.titleLabel.shadowColor = [UIColor colorWithWhite:0 alpha:0.5];

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// UIBarButtonItem+Image.h

@interface UIBarButtonItem (Image)

-(id)initWithImage:(UIImage *)image title:(NSString*)title target:(id)target action:(SEL)action;

@end

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@property (strong, nonatomic) IBOutlet UITextField *pin1_1;
@property (strong, nonatomic) IBOutlet UITextField *pin1_2;
@property (strong, nonatomic) IBOutlet UITextField *pin1_3;
@property (strong, nonatomic) IBOutlet UITextField *pin1_4;
@property (nonatomic, strong) NSString *pinText;


- (void)viewDidLoad
{
	(...)

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#import "NSMutableArray+Stack.h"
#define SHOW_ANIMATION_DURATON 0.5f

@property (nonatomic, strong) NSMutableArray *viewStack;

-(void)pushView:(UIView *)view
{
    UIView *anterior = [self.viewStack peek];
    [self.viewStack push:view];
    

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+ (UIImage *)convertImageToGrayScale:(UIImage *)img
{
    // Create image rectangle with current image width/height
    CGRect imageRect = CGRectMake(0, 0, img.size.width, img.size.height);
    
    // Grayscale color space
    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceGray();
    
    // Create bitmap content with current image size and grayscale colorspace
    CGContextRef context = CGBitmapContextCreate(nil, img.size.width, img.size.height, 8, 0, colorSpace, kCGImageAlphaNone);

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- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    NSString *newSearch = [textField.text stringByReplacingCharactersInRange:range withString:string];
    NSLog(@"%@",newSearch);
    
    if ([newSearch length] >= MIN_NUMBER_OF_CHARACTERS_TO_LAUCH_SEARCH)
    {
        //Hacer búsqueda con newSearch
    }