NSCharacterSet(只保留textField中输入的数字)

 

#define TEXT_INPUT_NUMBERS @"0123456789"

 

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string

{

　　if(textField == _textInput){

    　　 if(range.location >= 11){

          　　  return NO;

    　　 }

 

　　　　NSCharacterSet *cs;

 　　　  cs = [[NSCharacterSet   characterSetWithCharactersInString:TEXT_INPUT_NUMBERS] invertedSet];

    　　  NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs] componentsJoinedByString:@""];

   　　   BOOL basicTest = [string isEqualToString:filtered]; 

       　  return basicTest;

　　}

　　return YES;

}