Objective-c

There is nothing more irritating then the msg( debugger console) that are like this; -[NSFetchedResultsController class]: message sent to deallocated instance <some ddress> In order to track the erros which occur when you access the deallocated instance of an object All you need to do is few changes in environment variables step 1.Go to edit schemes step 2.Add MallocStackLOggingNoCompact   value … Read more

Hi Its really good being able to extract characters from NSstring as characters can be mathematically manipulated …here is the code snippet     unichar c[2];     char b;     NSRange range={0,2};     [@”a1″ getCharacters:c range:range];     printf(“%c%c”,c[0],c[1]);

Hi as a requirement i was asked to make an PGN parser in XCODE i made this from scratch and it is my original work .though this program is still buggy and it does not perform at professional level but it can still parse and extract no of games in one file extract a particular … Read more

Hi i saw an app made by one of my students and one thing which was missing in his app was a background image behind the table view. as a results when i scrolled the beautiful custom cells white background was visible…. an eye sore…. So here is a tutorial… 1.Take an Image view before the table … Read more

Recently i was making an NSMutableArray from a string by separating the string by component, Unfortunately it was filling too many empty useless elements into my array…in order to remove them i used following code  for (int i=0;i<contentsOfFile.count; i++)      {         if(!([[contentsOfFile objectAtIndex:i]isEqual:@”n”]||[[contentsOfFile objectAtIndex:i]isEqual:@””]||[[contentsOfFile objectAtIndex:i]isEqual:@”rn”]))         [arrayToBereturned addObject:[contentsOfFile objectAtIndex:i]];     … Read more

XCode takes RGB values in range [0,1] so in order to make a color from RGB values which you picked from any image editing tool you have to divide them by 255. e.g.  [UIColor colorWithRed:90 green:45 blue:10 alpha:1] wont work use [UIColor colorWithRed:(90/255) green:(45/255) blue:(10/255) alpha:1];

Methods of a Java interface are implicitly abstract and cannot have implementations where as a Java abstract class can have instance methods that implements a default behavior. Variables declared in a Java interface is by default final. An  abstract class may contain non-final variables. Members of a Java interface are public by default. A Java abstract class can have the … Read more

Hi I faced this problem and want to share it with u so that it can save your time….. when i updated my XCode project from svn its build failed due to this error… Undefined symbols for architecture i386:   “_OBJC_CLASS_$_Help”, referenced from:       objc-class-ref in Home.o ld: symbol(s) not found for architecture … Read more

Hiyou can find some good usefull code snippets http://iphonesdksnippets.com/archive.aspx

Hi steps of adding custom fonts in xcode is Add your custom font files into your project using XCode as resources. Add key font provided by application to your info plist.(array key) For each font add the full font file name along with extension as item into the key. Now you can use the font … Read more