iOS 字符串大小写转换

-( NSString  *)toLower:( NSString  *)str{      for  ( NSInteger  i=0; i<str.length; i++) {          if  ([str characterAtIndex:i]>= 'A' &[str characterAtIndex:i]<= 'Z' ) {              //A  65  a  97              char   temp=[str characterAtIndex:i]+32;              NSRange  range= NSMakeRange (i, 1);              str=[str stringByReplacingCharactersInRange:range withString:[ NSString  stringWithFormat:@ "%c" ,temp]];          }      }      return  str; }   -( NSString  *)toUpper:( NSString  *)str{      for  ( NSInteger  i=0; i<str.length; i++) {          if  ([str characterAtIndex:i]>= 'a' &[str characterAtIndex:i]<= 'z' ) {              //A  65  a  97              char   temp=[str characterAtIndex:i]-32;              NSRange  range= NSMakeRange (i, 1);              str=[str stringByReplacingCharactersInRange:range withString:[ NSString  stringWithFormat:@ "%c" ,temp]];          }      }      return  str; }

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