Author Archives: admin

How to remove selected string between parenthesis in xcode

Hi if you got a string which contains comment between some special characters then you can use – (NSString *)stringFilter:(NSString *)targetString {          NSScanner *theScanner;     NSString *text = nil;          theScanner = [NSScanner scannerWithString: targetString];          while ([theScanner isAtEnd] ==… Read more »

Change Customize UITextfield placeholder text in XCode

HI to change the color of UITextfield placeholder text there are three approaches 1. Override the drawPlaceholderInRect:(CGRect)rect  – (void) drawPlaceholderInRect:(CGRect)rect {     [[UIColor <your color>] setFill];     [[self placeholder] drawInRect:rect withFont:[UIFont systemFontOfSize:10]]; } 2.Access the private iVar(risky apple might not approve)     [self.password setValue:[UIColor colorWithRed:(160/255) green:(97/255) blue:(5/255) alpha:1]forKeyPath:@”_placeholderLabel.textColor”];   3.Its… Read more »

Finding XCode errors due to deallocated instances

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… Read more »

Identifying and removing white spaces new line and carriage return

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”]))        … Read more »

diffrence between abstract class and interface in java?

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… Read more »