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@interface UITextField (removeWhiteSpace )       - ( NSString *) removeWhiteSpaces ; @end     @implementation UITextField ( removeWhiteSpace )       - ( NSString *) removeWhiteSpaces       {          self . text =[ self . text stringByTrimmingCharactersInSet :                             [ NSCharacterSet whitespaceCharacterSet ]];           return self . text ;       } @end

Interview Questions : Q.1) Why using Categories in iOS? write a program to reverse a string. Q.2) Difference between Protocols, Delegate and Notification. Q.3) Explain the terms and where it  is used in iOS:     a. Deligation, and does delegate is retained ?     b. Informal Protocols, and Designate Initializer. Q.4) Explain the Memory Management Rules in Objective-C? Q.5) Using NSURL Class reference, define the meaning of synchronous and asynchronous  request in iOS with a demo example. Q.6) If I call performSelector:withObject:afterDelay: – Does the object retained? Q.7) For a given OBJECT of an unknown type, please explain following point in one or two lines:  How will you determine its class?  How will you verify that OBJECT confirms to a given protocol?  How will you verify the response of an OBJECT to a given message? Q.8) Explain the differences between nib and .xib. What is awakeFromNib? Q.9) Where does the N...