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- (void)apiRequestDone:(ASIHTTPRequest *)request
{
(...)
[NSJSONSerialization JSONObjectWithData:[request responseData] options: NSJSONReadingMutableContainers error:&error]

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+(void)navigationController:(UINavigationController *)navigationController PopNumberOfViews:(NSInteger)numberOfViews
{
    NSInteger count = [navigationController.viewControllers count];    
    UIViewController *vc = [navigationController.viewControllers objectAtIndex:(count - (1 + numberOfViews))];
    [navigationController popToViewController:vc animated:YES];
}

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    UINavigationBar *navBar = [[self navigationController] navigationBar];
    //If we want a custom logo:
    UIImage *backgroundImage = [UIImage imageNamed:@"background_im"];
    [navBar setBackgroundImage:backgroundImage forBarMetrics:UIBarMetricsDefault];
    
    self.navigationItem.titleView = [[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"logo_img"]] autorelease];
    
    self.navigationController.navigationBar.barStyle = UIBarStyleBlack;
    self.navigationController.navigationItem.backBarButtonItem.tintColor = [UIColor redColor];
    self.navigationController.navigationBar.tintColor = [UIColor redColor];

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//
//  UIColor+IntegerRGB.m
//  Shell mPayment
//
//  Created by Jose Luis Campaña on 8/21/12.
//
//

#import "UIColor+IntegerRGB.h"

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//
//  UIColor+IntegerRGB.h
//  Shell mPayment
//
//  Created by Jose Luis Campaña on 8/21/12.
//
//

#import <UIKit/UIKit.h>

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- (UITableViewCell*) tableView:(UITableView*)tableView cellForRowAtIndexPath:(NSIndexPath*)indexPath
{
    static NSString* customCellIdentifier = @"CustomCellIdentifier";
    CustomCell* cell = (CustomCell *) [tableView dequeueReusableCellWithIdentifier:customCellIdentifier];

    if (cell == nil)// tableview not associated (registered) with nib file.
    {
        UINib* customCellNib = [UINib nibWithNibName:@"CustomCell" bundle:nil]; // Register this nib file with cell identifier.
        [tableView registerNib: customCellNib forCellReuseIdentifier:customCellIdentifier];
    }

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Formula to find the width of UILabel with the text length

#define MY_LABEL_FONT_SIZE 18
#define MY_LABEL_TEXT_WIDTH_MULTIPLIER(MY_LABEL_FONT_SIZE/2 + 1)

For example if we have a String of length 8 characters then we can find the width of the UILabel which can fit the text as :
 
 8* MY_LABEL_TEXT_WIDTH_MULTIPLIER
and setting the Font Size of the UILabel text as  MY_LABEL_FONT_SIZE 

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static inline double radians (double degrees) {return degrees * M_PI/180;}

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//
//  UIImage-Extensions.m
//
//  Created by Hardy Macia on 7/1/09.
//  Copyright 2009 Catamount Software. All rights reserved.
//

#import "UIImage-Extensions.h"

CGFloat DegreesToRadians(CGFloat degrees) {return degrees * M_PI / 180;};

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//
//  UIImage-Extensions.h
//
//  Created by Hardy Macia on 7/1/09.
//  Copyright 2009 Catamount Software. All rights reserved.
//
#import <Foundation/Foundation.h>

@interface UIImage (CS_Extensions)
- (UIImage *)imageAtRect:(CGRect)rect;