ios - UItextfield shouldChangeCharactersInRange method backSpace not working -

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i implement code backspace not working until press delete button in uitextfield want backspace delete.

- (bool)textfield:(uitextfield *)textfield shouldchangecharactersinrange:(nsrange)range replacementstring:(nsstring *)string  {      nscharacterset *mycharset = [nscharacterset charactersetwithcharactersinstring:_demo_str];     (int = 0; < [string length]; i++) {          unichar c = [string characteratindex:i];          if ([mycharset characterismember:c]) {             return yes;       }     }     return no;   }

try code. working me 

- (bool)textfield:(uitextfield *)textfield shouldchangecharactersinrange:(nsrange)range replacementstring:(nsstring *)string  {    nscharacterset *mycharset = [nscharacterset charactersetwithcharactersinstring:_demo_str];   (int = 0; < [string length]; i++) {      unichar c = [string characteratindex:i];      if ([mycharset characterismember:c]) {         return yes;      }      else      {          return no;      }   }    return yes; }

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