Adding Box2D Files to your Cocos2D Project

1. First, download 'cocos2d-iphone-x.0.tar.gz' , and Open a Finder window and navigate to where you downloaded the Cocos2D source.
2. Open the folder and navigate to external\Box2d\Box2D. 
3. Open a second Finder window, navigate to your project, and navi-
   gate to libs. 
4. Copy the Box2D folder to the libs folder. 

• Adding the Box2D directory to your Xcode project   

• You have to set "User Header Search Paths" as 'Project_Name/libs'

• And also you have to add two more files :
  the ones responsible for drawing Box2D objects to the screen for debug purposes.

  navigate to your Cocos2D directory, and navigate to templates\cocos2d_box2d_app\Classes. Inside you’ll find the files GLES- Render.h and GLES-Render.mm. Select those two files and drag them to your new Box2D group in Xcode. Make sure Copy items into destination group’s folder (if needed) is checked, and click Finish.

• After that  #import "Box2D.h", what ever file you want and mack sure rename the file with a '.mm' extension. Because you are importing the Box2D header file (which uses C++) in files that are set up to use only Objective-C. To instruct the compiler to allow both C++ and Objective-C, we can add '.mm' extension.  

How to use DatePicker in iOS

UIDatePicker *_datePickerView = [[UIDatePicker alloc] initWithFrame:CGRectZero];

            _datePickerView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleTopMargin;

            _datePickerView.datePickerMode = UIDatePickerModeDate;

           

            CGRect pickerRect = CGRectMake(    0.0, 480, 320, 250);

            _datePickerView.frame = pickerRect;

            _datePickerView.hidden = YES;

            _datePickerView.datePickerMode = UIDatePickerModeDate;

            // in case we previously chose the Counter style picker, make sure

            // the current date is restored

            NSDate *today = [NSDate date];

            _datePickerView.date = today;

            _datePickerView.datePickerMode = UIDatePickerModeDate;

            [_datePickerView addTarget:self action:@selector(updateLabel:) forControlEvents:UIControlEventValueChanged];

           

            [parent.view addSubview:_datePickerView];

-(void)updateLabel:(id)sender

{

    NSDateFormatter *df = [[NSDateFormatter alloc] init];

    df.dateStyle = NSDateFormatterMediumStyle;

   

    NSCalendar *calendar = [NSCalendar currentCalendar];

    int year   =    [[calendar components:NSYearCalendarUnit    fromDate:[_datePickerView date]] year];

    int month  =    [[calendar components:NSMonthCalendarUnit   fromDate:[_datePickerView date]] month];

    int day    =    [[calendar components:NSDayCalendarUnit     fromDate:[_datePickerView date]] day];

   

    NSString *date = [NSString stringWithFormat:@"%d/%d/%d",year, month, day];//[df stringFromDate:_datePickerView.date]];

   

    [_birthdayLabel setTitle:date forState:UIControlStateNormal];

   

    /* the following allows you to choose the date components

     NSCalendar *calendar = [NSCalendar currentCalendar];

    

     int hour   =    [[calendar components:NSHourCalendarUnit    fromDate:[datePicker date]] hour];

     int minute =    [[calendar components:NSMinuteCalendarUnit  fromDate:[datePicker date]] minute];

    

     int year   =    [[calendar components:NSYearCalendarUnit    fromDate:[datePicker date]] year];

     int month  =    [[calendar components:NSMonthCalendarUnit   fromDate:[datePicker date]] month];

     int day    =    [[calendar components:NSDayCalendarUnit     fromDate:[datePicker date]] day];

     */

}

How to add left padding to the UITextField, when add background Image

#import "QuartzCore/QuartzCore.h"    // First import this Framework

......

UITextField *_emailText = [[UITextField alloc]initWithFrame:CGRectMake(40, 8, 250, 34)];

//    _emailText.borderStyle = UITe;  // Please set borderStyle to default value, otherwise it is not working.

    _emailText.delegate = self;

    _emailText.placeholder = @"Email";

    [_emailText setFont:[UIFont boldSystemFontOfSize:12]];

    _emailText.tag = 1;

    _emailText.returnKeyType = UIReturnKeyNext;

    _emailText.textAlignment = UITextAlignmentLeft;

    _emailText.keyboardType = UIKeyboardTypeEmailAddress;

    _emailText.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;

    _emailText.leftView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 12, 20)];

    _emailText.leftViewMode = UITextFieldViewModeAlways;

    _emailText.background = [[UIImage imageNamed:@"textBox.png"] stretchableImageWithLeftCapWidth:7 topCapHeight:17];

    [self.view addSubview:_emailText];