iPhone PassCode Screen

  

An Example for Pass code screen simple create single view app in 

ViewController.h

#import <UIKit/UIKit.h>
typedef enum {
    CPLockControllerTypeAuth,
    CPLockControllerTypeSet
} CPLockControllerStyle;

@protocol CPLockControllerDelegate<UITextFieldDelegate>

@required
- (void)lockControllerDidFinish:(NSString*)passcode;
- (void)lockControllerDidCancel;

@end

@interface ViewController : UIViewController
{
    //Public vars
    CPLockControllerStyle style;
    NSString *passcode;
    NSString *prompt;
    NSString *title;
    id <CPLockControllerDelegate> delegate;
    BOOL hideCode;
   
    //Private vars
    BOOL retry;
    NSMutableString *tempString;
    //UI Elements
    UITextField *hiddenField;
    IBOutlet UILabel *promptLabel;
     IBOutlet UILabel *subPromptLabel;
//    UILabel *subPromptLabel;
    IBOutlet UITextField *field1;
    IBOutlet UITextField *field2;
    IBOutlet UITextField *field3;
    IBOutlet UITextField *field4;
}

@property (nonatomic, assign) id delegate;
@property (nonatomic, copy) NSString *title;
@property (nonatomic) CPLockControllerStyle style;
@property (nonatomic, retain) NSString *passcode;
@property (nonatomic, retain) NSString *prompt;
@property (nonatomic) BOOL hideCode;

- (void)setTitle:(NSString *)title;

@end

ViewCotroller.m

#import "ViewController.h"

#define kCPLCDefaultSetPrompt            @"Enter your new passcode"
#define kCPLCDefaultAuthPrompt            @"Enter your passcode"

#define kCPLCDefaultSetTitle            @"Set Passcode"
#define kCPLCDefaultConfirmTitle        @"Confirm Passcode"
#define kCPLCDefaultAuthTitle            @"Enter Passcode"

#define kCPLCDefaultSetError            @"Passcodes did not match. Try again."
#define kCPLCDefaultAuthError            @"Passcode incorrect. Try again."


@interface ViewController ()
- (void)setupSubviews;
//


//- (void)setupNavigationBar;
- (void)setupTextFields;
- (void)resetFields;
- (void)passcodeDidNotMatch;
- (void)dissmissView;

@property (nonatomic, retain) NSMutableString *tempString;
@property (nonatomic) BOOL retry;
@property (nonatomic, retain) UILabel *promptLabel;
@property (nonatomic, retain) UILabel *subPromptLabel;
@property (nonatomic, retain) UITextField *hiddenField;
//@property (nonatomic, retain) UINavigationItem *navigationItem;

@end

@implementation ViewController
@synthesize delegate,style,passcode,prompt,hiddenField,promptLabel,subPromptLabel,tempString,retry,title,hideCode;
- (id)initWithStyle:(CPLockControllerStyle)theStyle {
    if(self = [super init]){
        self.style = theStyle;
        self.retry = NO;
        self.tempString = [NSMutableString string];
            }
   
    return self;
}

- (void)viewDidLoad
{//passed default string you can use yours by setting page
    passcode = @"1234";
       
    //check if passcode is set for CPLockControllerTypeAuth
    if(style == CPLockControllerTypeAuth){
        assert(passcode != nil);
    }
   
    [self setupSubviews];

  //  [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}
- (void)setupSubviews {
   
       
    //prompt

    if(prompt == nil){
        if(self.style == CPLockControllerTypeSet){
            prompt = kCPLCDefaultSetPrompt;
        } else if(self.style == CPLockControllerTypeAuth){
            prompt = kCPLCDefaultAuthPrompt;
        }
    }
   
    //main prompt
    promptLabel.text = prompt;
   
    promptLabel.backgroundColor = [UIColor clearColor];
    promptLabel.shadowColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:.50];
    promptLabel.font = [UIFont systemFontOfSize:[UIFont labelFontSize]];
    promptLabel.shadowOffset = CGSizeMake(0, -0.75);
    promptLabel.textColor = [UIColor colorWithRed:0.318 green:0.345 blue:0.416 alpha:1.000];
    [self.view addSubview:promptLabel];
    [self setupTextFields];
}
- (void)setupTextFields {
   
    //create four textfields
   
    field1.backgroundColor = [UIColor whiteColor];
    field1.borderStyle = UITextBorderStyleBezel;
    //field1.enabled = NO;
    field1.secureTextEntry =YES;
        field1.tag = 0;
   
   
    field2.backgroundColor = [UIColor whiteColor];
    field2.borderStyle = UITextBorderStyleBezel;
    field2.enabled = NO;
    field2.secureTextEntry = YES;
   
    field2.tag = 2;
    field3.backgroundColor = [UIColor whiteColor];
    field3.borderStyle = UITextBorderStyleBezel;
    field3.enabled = NO;
    field3.secureTextEntry =YES;
   
    field3.tag = 3;
    field4.backgroundColor = [UIColor whiteColor];
    field4.borderStyle = UITextBorderStyleBezel;
    field4.enabled = NO;
    field4.secureTextEntry = YES;
    field4.tag = 4;
       
    //this is the field the passcode is put into
    hiddenField = [[UITextField alloc]initWithFrame:CGRectMake(-3000,-3000,0,0)];
    hiddenField.text = @"";
    hiddenField.keyboardType = UIKeyboardTypeNumberPad;
    [hiddenField becomeFirstResponder];
    hiddenField.delegate = self;
    [self.view addSubview:hiddenField];
   
   
   
   
}
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
    int charcount = [textField.text length];
   
    if(self.retry == YES){
        charcount-=1;
    }
   
    if(charcount == 0){
        field1.text = string;
    } else if(charcount == 1){
        field2.text = string;
    } else if(charcount == 2){
        field3.text = string;
    } else if(charcount == 3){
        field4.text = string;
    }
    [self.tempString appendString:string];
   
    //we've reached 4 chars
    if(charcount == 3){
       
        if(self.style == CPLockControllerTypeSet){
           
            if(passcode == nil){
                //empty tempstring to passcode string
                passcode = [self.tempString copy];
               
                self.tempString = [NSMutableString string];
               
                //reset visible/hidden fields
                [self resetFields];
               
                promptLabel.text = kCPLCDefaultConfirmTitle;
                self.retry = YES;
            } else {
                //check if confirm matches first
                if([passcode isEqualToString:self.tempString]){
                    [delegate lockControllerDidFinish:passcode];
                    [self dissmissView];
                   
                    //confirm passcode doesn't match
                } else {
                    [self passcodeDidNotMatch];
                }
               
            }
           
        } else if(self.style == CPLockControllerTypeAuth){
            if([passcode isEqualToString:self.tempString])

{
NSLog(@"Correct Password Show your next window here");
               

               
            } else {
                [self passcodeDidNotMatch];
               
            }
           
           
        }
    }   
   
    return YES;
}

- (void)passcodeDidNotMatch {
    self.tempString = [NSMutableString string];
    if(self.style == CPLockControllerTypeSet){
       
        UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"Alert" message:@"Encorrect PIN" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
        [alert show];
        //subPromptLabel.text = kCPLCDefaultSetError;
    } else if(self.style == CPLockControllerTypeAuth){
        //subPromptLabel.text = kCPLCDefaultAuthError;
        UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"Alert" message:@"Encorrect PIN" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
        [alert show];
    
       
       
    }
    self.retry = YES;
    [self resetFields];
}

- (void)resetFields {
    field1.text = @"";
    field2.text = @"";
    field3.text = @"";
    field4.text = @"";
    hiddenField.text = @"";
}

- (void)dissmissView {
   
    [self dismissViewControllerAnimated:YES completion:nil];
   
}

- (void)userDidCancel:(id)sender {
    //[delegate lockControllerDidCancel];
    [self dissmissView];
}

////////////////////////////////////////////

Xib Should be designed with 4 text fields

Thank You.........:)