The Blog-Health-o-Meter™ reads This blog is on fire!.

Crunchy numbers

About 3 million people visit the Taj Mahal every year. This blog was viewed about 28,000 times in 2010. If it were the Taj Mahal, it would take about 3 days for that many people to see it.

In 2010, there were 4 new posts, growing the total archive of this blog to 10 posts.

The busiest day of the year was September 28th with 159 views. The most popular post that day was Apple Push Notification Service Tutorial.

Where did they come from?

The top referring sites in 2010 were iphonedevsdk.com, google.co.in, davidbits.blogspot.com, google.com, and cocoachina.com.

Some visitors came searching, mostly for iphone push notification tutorial, uiview animation tutorial, iphone animation tutorial, push notification tutorial, and iphone view animation.

Attractions in 2010

These are the posts and pages that got the most views in 2010.

Apple Push Notification Service Tutorial July 2009
55 comments

View Animation Tutorial August 2009
3 comments

iPhone Email Validation for Text Fieldone July 2009
2 comments

No launchable executable present at path August 2009

LinkedIn API and Twitter API access using GOOGLE Data API June 2010
3 comments

Have created sample application that demonstrates the use of this custom view.

Sample project available to download at http://code.google.com/p/dropdowndemo/downloads/list.

Adding instruction how to use view in you application.

1. Import QuartzCore.framework in your application.
2. Import DropDownView.h file in the view controller.
3. Have an class variable dataArray to store data to be put into the table and make a class variable of DropDownView. Making DropDownView variable allows you to control the DropDownView.
4. Use the DropDownViewDelgate and declare the delegate method in your application.
5. Initialize the DropdownView variable and add the view in your current view, andy your ready to go.

Below a demo sample classes.

FirstController.h

--------------------
#import <UIKit/UIKit.h>

#import "DropDownView.h"

@interface FirstController : UIViewController<DropDownViewDelegate> {

 UIButton *button;

 NSArray *arrayData;

 DropDownView *dropDownView;

}

@property (nonatomic,retain) IBOutlet UIButton *button;

-(IBAction)actionButtonClick;

@end

--------------

FirstController.m

-----------
#import "FirstController.h"

@implementation FirstController

@synthesize button;

- (void)viewDidLoad {

 [super viewDidLoad];

 arrayData = [[NSArray alloc] initWithArray:[NSArray arrayWithObjects:@"Test1",@"Test2",nil]];

 dropDownView = [[DropDownView alloc] initWithArrayData:arrayData cellHeight:30 heightTableView:200 paddingTop:-8 paddingLeft:-5 paddingRight:-10 refView:button animation:BLENDIN openAnimationDuration:2 closeAnimationDuration:2];

 dropDownView.delegate = self;

 [self.view addSubview:dropDownView.view];

 [button setTitle:[arrayData objectAtIndex:0] forState:UIControlStateNormal];

}

- (void)didReceiveMemoryWarning {
 [super didReceiveMemoryWarning];
}

- (void)viewDidUnload {
 [super viewDidUnload];

}

- (void)dealloc {

 [button release];

 [super dealloc];

}

#pragma mark -
#pragma mark DropDownViewDelegate

-(void)dropDownCellSelected:(NSInteger)returnIndex{

 [button setTitle:[arrayData objectAtIndex:returnIndex] forState:UIControlStateNormal];

}    

#pragma mark -
#pragma mark Class methods

-(IBAction)actionButtonClick{

 [dropDownView openAnimation];

}    

@end

------------

DropDownView.h

------------------- #import <UIKit/UIKit.h> typedef enum {
BLENDIN,
GROW,
BOTH
} AnimationType; @protocol DropDownViewDelegate @required -(void)dropDownCellSelected:(NSInteger)returnIndex; @end @interface DropDownView : UIViewController<UITableViewDelegate,UITableViewDataSource> { UITableView *uiTableView; NSArray *arrayData; CGFloat heightOfCell; CGFloat paddingLeft; CGFloat paddingRight; CGFloat paddingTop; CGFloat heightTableView; UIView *refView; id<DropDownViewDelegate> delegate; NSInteger animationType; CGFloat open; CGFloat close; } @property (nonatomic,assign) id<DropDownViewDelegate> delegate; @property (nonatomic,retain)UITableView *uiTableView; @property (nonatomic,retain) NSArray *arrayData; @property (nonatomic) CGFloat heightOfCell; @property (nonatomic) CGFloat paddingLeft; @property (nonatomic) CGFloat paddingRight; @property (nonatomic) CGFloat paddingTop; @property (nonatomic) CGFloat heightTableView; @property (nonatomic,retain)UIView *refView; @property (nonatomic) CGFloat open; @property (nonatomic) CGFloat close; - (id)initWithArrayData:(NSArray*)data cellHeight:(CGFloat)cHeight heightTableView:(CGFloat)tHeightTableView paddingTop:(CGFloat)tPaddingTop paddingLeft:(CGFloat)tPaddingLeft paddingRight:(CGFloat)tPaddingRight refView:(UIView*)rView animation:(AnimationType)tAnimation  openAnimationDuration:(CGFloat)openDuration closeAnimationDuration:(CGFloat)closeDuration; -(void)closeAnimation; -(void)openAnimation; @end
----------

DropDownView.m

------------
#import "DropDownView.h"

#import <QuartzCore/QuartzCore.h>

@implementation DropDownView

@synthesize uiTableView;

@synthesize arrayData,heightOfCell,refView;

@synthesize paddingLeft,paddingRight,paddingTop;

@synthesize open,close;

@synthesize heightTableView;

@synthesize delegate;

- (id)initWithArrayData:(NSArray*)data cellHeight:(CGFloat)cHeight heightTableView:(CGFloat)tHeightTableView paddingTop:(CGFloat)tPaddingTop paddingLeft:(CGFloat)tPaddingLeft paddingRight:(CGFloat)tPaddingRight refView:(UIView*)rView animation:(AnimationType)tAnimation openAnimationDuration:(CGFloat)openDuration closeAnimationDuration:(CGFloat)closeDuration{

 if ((self = [super init])) {

 self.arrayData = data;

 self.heightOfCell = cHeight;

 self.refView = rView;

 self.paddingTop = tPaddingTop;

 self.paddingLeft = tPaddingLeft;

 self.paddingRight = tPaddingRight;

 self.heightTableView = tHeightTableView;

 self.open = openDuration;

 self.close = closeDuration;

 CGRect refFrame = refView.frame;

 self.view.frame = CGRectMake(refFrame.origin.x-paddingLeft,refFrame.origin.y+refFrame.size.height+paddingTop,refFrame.size.width+paddingRight, heightTableView);

 self.view.layer.shadowColor = [[UIColor blackColor] CGColor];

 self.view.layer.shadowOffset = CGSizeMake(5.0f, 5.0f);

 self.view.layer.shadowOpacity =1.0f;

 self.view.layer.shadowRadius = 5.0f;

 animationType = tAnimation;

 }

 return self;

}    

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {

 [super viewDidLoad];

 CGRect refFrame = refView.frame;

 uiTableView = [[UITableView alloc] initWithFrame:CGRectMake(0,0,refFrame.size.width+paddingRight, (animationType == BOTH || animationType == BLENDIN)?heightTableView:1) style:UITableViewStylePlain];

 uiTableView.dataSource = self;

 uiTableView.delegate = self;

 [self.view addSubview:uiTableView];

 self.view.hidden = YES;

 if(animationType == BOTH || animationType == BLENDIN)
 [self.view setAlpha:1];

}

- (void)didReceiveMemoryWarning {
 [super didReceiveMemoryWarning];
}

- (void)viewDidUnload {
 [super viewDidUnload];

}

- (void)dealloc {
 [super dealloc];
 [uiTableView release];
 [arrayData,refView release];

}

#pragma mark -
#pragma mark UITableViewDelegate

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{

 return heightOfCell;

}    

- (NSInteger)tableView:(UITableView *)table numberOfRowsInSection:(NSInteger)section{

 return [arrayData count];

}    

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{

 static NSString *CellIdentifier = @"Cell";

 UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

 if (cell == nil) {

 cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];

 }

 cell.textLabel.text = [arrayData objectAtIndex:indexPath.row];

 return cell;

}    

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

 [delegate dropDownCellSelected:indexPath.row];

 [self closeAnimation];

}

- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section{

 return 0;

}

- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section{

 return 0;

}    

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section{

 return @"";
}    

- (NSString *)tableView:(UITableView *)tableView titleForFooterInSection:(NSInteger)section{

 return @"";

}    

#pragma mark -
#pragma mark DropDownViewDelegate

-(void)dropDownCellSelected:(NSInteger)returnIndex{

}    

#pragma mark -
#pragma mark Class Methods

-(void)openAnimation{

 self.view.hidden = NO;

 NSValue *contextPoint = [[NSValue valueWithCGPoint:self.view.center] retain];

 [UIView beginAnimations:nil context:contextPoint];

 [UIView setAnimationDuration:open];

 [UIView setAnimationCurve:UIViewAnimationCurveLinear];

 [UIView setAnimationRepeatCount:1];

 [UIView setAnimationDelay:0];

 if(animationType == BOTH || animationType == GROW)
 self.uiTableView.frame = CGRectMake(uiTableView.frame.origin.x,uiTableView.frame.origin.y,uiTableView.frame.size.width, heightTableView);

 if(animationType == BOTH || animationType == BLENDIN)
 self.view.alpha = 1;

 [UIView commitAnimations];

}

-(void)closeAnimation{

 NSValue *contextPoint = [[NSValue valueWithCGPoint:self.view.center] retain];

 [UIView beginAnimations:nil context:contextPoint];

 [UIView setAnimationDuration:close];

 [UIView setAnimationCurve:UIViewAnimationCurveLinear];

 [UIView setAnimationRepeatCount:1];

 [UIView setAnimationDelay:0];

 if(animationType == BOTH || animationType == GROW)
 self.uiTableView.frame = CGRectMake(uiTableView.frame.origin.x,uiTableView.frame.origin.y,uiTableView.frame.size.width, 1);

 if(animationType == BOTH || animationType == BLENDIN)
 self.view.alpha = 0;

 [UIView commitAnimations];

 [self performSelector:@selector(hideView) withObject:nil afterDelay:close];

}

-(void)hideView{

 self.view.hidden = YES;

}     

@end

Was facing problem linkedin API access using a suitable oauth client framework for iPhone.

The problem was there was no proper solution for this.

I had already come accross Google data API and their touch sample code available at http://code.google.com/p/gdata-objectivec-client/. which I was tring to access gmail for mails, but seems they have not opened that yet, although they provide access to Contact api.

Struggling to find an api access to linked in from iPhone stumbled upon this thread http://developer.linkedin.com/thread/1447 which redirected me to this http://developer.linkedin.com/thread/1169. Here you will find a lot of comments and sample application created by “Scott” and if u mail him you will get the source.

But still I was not satisfied as I wanted to use  MPOAuthMobile for iPhone for a unified access to twitter and linkedin.

So here is the simple and elegant solution using  Google Data API , (you can trust google so I prefer it as a solution).

Simply download the the sample from http://code.google.com/p/gdata-objectivec-client/

Replace twitter

keys as below

NSString *myConsumerKey = @”XXXXXXXXX”; //NEED TO ENTER YOUR CONSUMER
KEY FROM LINKEDIN API

NSString *myConsumerSecret = @”XXXXXX”; //NEED TO ENTER YOUR CONSUMER
SECRET FROM LINKEDIN API

I accept that you have a consumer secrete and key. Else get it by registering your application at https://www.linkedin.com/secure/developer

and replace the URL set as below

NSURL *requestURL = [NSURL URLWithString:@"
https://api.linkedin.com/uas/oauth/requestToken"];
NSURL *authorizeURL = [NSURL URLWithString:@"
https://api.linkedin.com/uas/oauth/authorize"];
NSURL *accessURL = [NSURL URLWithString:@"
https://api.linkedin.com/uas/oauth/accessToken"];
NSString *scope = nil;

do not forget to replace this with your reverse domain name as

static NSString *const kAppServiceName = @”com.YOURDOMAIN.OAuthSampleTouch”;
static NSString *const kShouldSaveInKeychainKey = @”shouldSaveInKeychain”;

Run your application, click twiter tab and singin.

You should get a web view where you can login and the application pops back to return the oauth token.

This is where I got the solution

http://groups.google.com/group/gdata-objectivec-client/browse_thread/thread/d876c078b677334/5981e36d77c2151f?lnk=gst&q=Can+we+use+OAuth+Sample+provided+in+google+data+api+to+work+with+LinkedIn+Api#5981e36d77c2151f

Twitter API access using Google Data API

The application provided google should simply work simply you have take care of the following points.

Create your application at https://twitter.com/apps

• Application Type: Browser not client ( if is a client application
  then will prompt for a pin which is used in the application to
  authenticate.).
• Website: provide some web site.
• Use Twitter for login: check mark Yes, use Twitter for login.
• Callback URL:    http://www.google.com/OAuthCallback

Was using some kind of JSON parser ,(will put the name later) , to fetch tweets. every thing was running fine until I wanted to store the latest tweet’s status_id. Here I ran into serious trouble. I was using integer in the database and keeping the tweet_status _id as my tuple (table row) identity. The problem I faced here was all other things converted well like the user id , tweet text etc. when tried to convert status_id would find some garbled entry , really strange. After long unsuccessful efforts in converting twitter status id in to integer , I finally noticed that the size of the number was very big. Bingo the solution was not far just need to convert NSString to double value. So I thought of some fixed approach to deal with twitter data.

1. Better not store the converted form of twitter data in the database, for data like status ids, I store it as char or text. Convert it to its true form only when required to compare , like need to store the max status tweet id by comparing with rest tweets id.
2. Never keep twitter status as  identity in your table. Remember in iPhone your using SQLite db.
3. The only two fields can cause serious problem in future in the application are tweet’s status id and tweet’s status’s user id. Better keep them as text and handle them as  double. the use id fit as a integer now , but soon will be out of integer scoop.

This post I have put up to show some light to developers goggling for the problem I faced. Please comment to impove this post and, I will include the points it the main post itself.

• Records where not getting inserted into database .
• Existing records could not be updated.
• The log and NSAssertion showed now error.

Tried to debug and found that the SQLite message after committing to db was 19 (SQLITE_CONSTRAINT) , this did not convey much information. Drilled down the SQLite static for the message and found “Abort due to constraint violation” for meaage 19. Googled but could not find much of help out there, and my project was stranded. While checking every thing from scratch found that thee where condition enforced on the column of table NOT NULL, like  id was PRIMAY KEY AUTO INCREMENT NOT NULL. This was the cause of the issue , as I wanted the SQLite to generate id for me but also had said you require an id field for an insertion to complete. The same problem was with some other column.

So I decided to keep some guideline for dealing with SQLite and iPhone connections.

1. Never create primary key column of table with both the restrictions ON (TUE) , that is  AUTO INCREMENT NOT NULL. This rule can ignored, if you want to manage your own primary key creation.
2. Never create column of table with restrictions NOT NULL, unless you are absolutely sure you will always have a value for the column. This rule can be ignored if you are managing NULL value entries in UI input fields from SQLite connection. No one uses this approach, of checking NULL from SQL, as every one wants to check input from the view in the controller itself.  So this rule must not be broken.
3. When dealing with sqlite3_step() don’t depend on SQLITE_ERROR (1) ( SQL error or missing database ) to catch error with your SQL statements. Better look for  SQLITE_DONE (101) ( has finished executing successfully), rest everything is an error, even constrain violation.

My post may look silly, for an expert but even an expert makes a silly mistake.

• Close all instance and main xcode application.
• Go to application folder of concern and simply delete the build folder and click the xcode executable in your application folder to start.

This should solve your problem.

Lets start by taking a simple view based application.

Open the view controller class file of the application and you will find an commented method ” -(void)viewDidLoad” copy past the following line of code in the scope of the method.

[super viewDidLoad];

/* Simple Viewable red rectrangle */

UIView *view = [[UIView alloc] initWithFrame:CGRectMake(100,100,100,50)];

view.backgroundColor = [UIColor redColor];

[self.view addSubview:view];

/* Create simple animation */

//Create context for animation

NSValue *contextPoint = [[NSValue valueWithCGPoint:view.center] retain];

[UIView beginAnimations:nil context:contextPoint];

//Animation duration in float

[UIView setAnimationDuration:5];

//Animation process curve

[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];

//Animation repeate

[UIView setAnimationRepeatCount:1];

//Animation start after delay

[UIView setAnimationDelay:1];

//Apply transformations in combination to the view

view.transform =  CGAffineTransformConcat(

CGAffineTransformConcat(

CGAffineTransformConcat(

CGAffineTransformMakeTranslation(-12,0),CGAffineTransformMakeScale(3,3)),

CGAffineTransformMakeRotation(3.14)),

CGAffineTransformMake(1,2,3,4,5,6));

[UIView commitAnimations];

• The above comments for the pice of code are self explanatory.
• Lines 5 to 7 help to create simple res rectangle and adds as a sub-view of the current view.
• Now for animation we have to create an canvas which is called our context. The context is created with the line 11 and 12.
• Now we have to tell what the animation should be like.
• Line 5 states that the entire animation will be completed in 5 seconds. The input is fraction hence takes in 5.5 etc also.
• Line 18 states the animation curve, that is what speed the animation should proceed. The variant of the values are.

UIViewAnimationCurveEaseInOut
An ease-in ease-out curve causes the animation begins slowly, accelerate through the middle of its
duration, and then slow again before completing.
Available in iPhone OS 2.0 and later.
Declared in UIView.h.
UIViewAnimationCurveEaseIn
An ease-in curve causes the animation to begin slowly, and then speed up as it progresses.
Available in iPhone OS 2.0 and later.
Declared in UIView.h.
UIViewAnimationCurveEaseOut
An ease-out curve causes the animation to begin quickly, and then slow as it completes.
Available in iPhone OS 2.0 and later.
Declared in UIView.h.
UIViewAnimationCurveLinear
A linear animation curve causes an animation to occur evenly over its duration.
Available in iPhone OS 2.0 and later.
Declared in UIView.h.

• Line 21 states how many repetation of the animation are required. Takes fraction input but not 0 to denote infinite loops, but we have to specify the number of loop. try changing the value to 1.5 in your application. The animation will run once full then a half.
• Line 24 states the delay after which the animation should start.
• Line 27 is the core of the animation process. The various transformations that should be animated. This step consists of 4 transformations all concatenation into one transformation.
• There are basic 4 transforms
  
  • CGAffineTransformMakeTranslation(-12,0) This statement states that your context will move to left by 12 px and 0 up or down.
  • CGAffineTransformMakeScale(3,3) Will multiply the width and height by 3 and 3 respectively.
  • CGAffineTransformMakeRotation(3.14) Will rotate the context by (pi) 3.14 . You can rotate from 0(0) to 180 ((pi) 3.14) degress repectively (clock wize for positive and anti clock wise for negative.).
  • CGAffineTransformMake(1,2,3,4,5,6) This statement directly works on the animation matrix. For more information on this.   ref wiki and iPhone docs.

  The last statement actually starts the animation.

• This is a small picture to animate small rectangle the complete view can be animated transformational similarly.

]]> http://ameyashetti.wordpress.com/2009/08/17/view-animation-tutorial/feed/ 4 ameyashetti 1 2 3 4 5 http://ameyashetti.wordpress.com/2009/07/31/objetive-c-detect-empty-null-entry-in-nsdictionary/ http://ameyashetti.wordpress.com/2009/07/31/objetive-c-detect-empty-null-entry-in-nsdictionary/#comments Fri, 31 Jul 2009 09:28:41 +0000 Ameya http://ameyashetti.wordpress.com/?p=11 ]]> A small work around for problem faced with NSDictionary null return problem.

In cases like

NSString *myImageURL = [user objectForKey:@"imageURL"];

where [user objectForKey:@"imageURL"] may return NSNull object.

This makes myImageURL a NSNull object hence cannot be compared using conventional comparisons. An NSNull is an invalid memory allocation or an error.:)

Two alternative solutions are

if ((NSNull *)[user objectForKey:@"imageURL"] == [NSNull null]) { }

and to convert to string if the above does not works.

NSString *myImageURL = [NSString stringWithFormat:@"%@",[user objectForKey:@"imageURL"]];

this can be compared by

if([imgURL isEqualToString:@""]){
}

Found an sample as below.

NSString *mystring = @"Hello World!";
NSString *regex = @".*l{2,}.*";
NSPredicate *regextest = [NSPredicate
                         predicateWithFormat:@"SELF MATCHES %@", regex];
if ([regextest evaluateWithObject:mystring] == YES) {
    NSLog(@"Match!");
} else {
    NSLog(@"No match!");
}

The above code will not work as NSPredicate is not available for iPhone framework.
Also found an sample that had the following code as below.

RegexKitLite Objective-C ÕýÔò±í´ïʾ_ССµÄÌ«Ñô 

NSString *email=@”asd@fgh.com”;
NSString *strEmailMatchstring=@”\\b([a-zA-Z0-9%_.+\\-]+)@([a-zA-Z0-9.\\-]+?\\.[a-zA-Z]{2,6})\\b”;
if(![email isMatchedByRegex:strEmailMatchstring]){

NSLog(@”Invalid email address found”);
objAlert = [[UIAlertView alloc] initWithTitle:@”Error!” message:

@”Enter a valid e-mail address” delegate:nil cancelButtonTitle:nil otherButtonTitles:@”Try Again”,nil];
[objAlert show];[objAlert release];

}

 
Found Regex download , which is available at http://downloads.sourceforge.net/regexkit/RegexKitLite-3.0.tar.bz2

* To include the RegexKitLite.h and RegexKitLite.m file in you project.

* In project setting search "other" at Other Linker Flags put the word "-licucore".

* Import header in the view controller where it will be used.

Modify the above method to as follows.
 -(BOOL)emailValidate:(NSString *)email{
 NSString *strEmailMatchstring=@"\\b([a-zA-Z0-9%_.+\\-]+)@([a-zA-Z0-9.\\-]+?\\.[a-zA-Z]{2,6})\\b";
 if([email isMatchedByRegex:strEmailMatchstring])
 return YES;
 else
 return NO;
 }

Created an method of my own hope this would help people searching for such validation methods.

-(BOOL)emailValidate NSString *)email{

//Based on the string below
//NSString *strEmailMatchstring=@”\\b([a-zA-Z0-9%_.+\\-]+)@([a-zA-Z0-9.\\-]+?\\.[a-zA-Z]{2,6})\\b”;

//Quick return if @ Or . not in the string
if([email rangeOfString:@"@"].location==NSNotFound || [email rangeOfString:@"."].location==NSNotFound)
return NO;

//Break email address into its components
NSString *accountName=[email substringToIndex: [email rangeOfString:@"@"].location];
email=[email substringFromIndex:[email rangeOfString:@"@"].location+1];

//’.’ not present in substring
if([email rangeOfString:@"."].location==NSNotFound)
return NO;
NSString *domainName=[email substringToIndex:[email rangeOfString:@"."].location];
NSString *subDomain=[email substringFromIndex:[email rangeOfString:@"."].location+1];

//username, domainname and subdomain name should not contain the following charters below
//filter for user name
NSString *unWantedInUName = @” ~!@#$^&*()={}[]|;’:\”<>,?/`”;
//filter for domain
NSString *unWantedInDomain = @” ~!@#$%^&*()={}[]|;’:\”<>,+?/`”;
//filter for subdomain
NSString *unWantedInSub = @” `~!@#$%^&*()={}[]:\”;’<>,?/1234567890″;

//subdomain should not be less that 2 and not greater 6
if(!(subDomain.length>=2 && subDomain.length<=6)) return NO;

if([accountName isEqualToString:@""] || [accountName rangeOfCharacterFromSet:[NSCharacterSet characterSetWithCharactersInString:unWantedInUName]].location!=NSNotFound || [domainName isEqualToString:@""] || [domainName rangeOfCharacterFromSet:[NSCharacterSet characterSetWithCharactersInString:unWantedInDomain]].location!=NSNotFound || [subDomain isEqualToString:@""] || [subDomain rangeOfCharacterFromSet:[NSCharacterSet characterSetWithCharactersInString:unWantedInSub]].location!=NSNotFound)
return NO;

return YES;
}

]]> http://ameyashetti.wordpress.com/2009/07/31/iphone-email-validation-for-text-field/feed/ 3 ameyashetti http://ameyashetti.wordpress.com/2009/07/31/mailto-problem-string-stringbyaddingpercentescapesusingencodingnsasciistringencoding-return-null/ http://ameyashetti.wordpress.com/2009/07/31/mailto-problem-string-stringbyaddingpercentescapesusingencodingnsasciistringencoding-return-null/#comments Fri, 31 Jul 2009 09:25:43 +0000 Ameya http://ameyashetti.wordpress.com/?p=7 ]]> It is possible that [subject stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding], may return null, if subject contains ASCII charter out side 0 to 127.

NSString *mailString = [NSString stringWithFormat:@"mailto to=%@&subject=%@&body=%@",
[to stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding],
[subject stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding],
[body stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding]];

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:mailString]];

To stop this we can use an simple filter like.
-(NSString *)replaceLatin NSString *)string{

return [[[[[[[[[[[[string stringByReplacingOccurrencesOfString:@"–" withString:@""] stringByReplacingOccurrencesOfString:@”—” withString:@”"] stringByReplacingOccurrencesOfString:@”¡” withString:@”"] stringByReplacingOccurrencesOfString:@”¿” withString:@”"] stringByReplacingOccurrencesOfString:@””” withString:@”"] stringByReplacingOccurrencesOfString:@”“” withString:@”"] stringByReplacingOccurrencesOfString:@”\”" withString:@”"] stringByReplacingOccurrencesOfString:@”‘” withString:@”"] stringByReplacingOccurrencesOfString:@”’” withString:@”"] stringByReplacingOccurrencesOfString:@”‘” withString:@”"] stringByReplacingOccurrencesOfString:@”«” withString:@”"] stringByReplacingOccurrencesOfString:@”»” withString:@”"];
}