iOS__字母大小写互转

OC字母大小写互转

• 大写转小写
  -(NSString *)stringToLower:(NSString *)str{
  for (NSInteger i = 0; i < str.length; i++) {
  if ([str characterAtIndex:i] >= 'A' & [str characterAtIndex:i] <= 'Z') {
  char temp = [str characterAtIndex:i]+32;
  NSRange range = NSMakeRange(i, 1);
  str = [str stringByReplacingCharactersInRange:range withString:[NSString stringWithFormat:@"%c",temp]];
  }
  }
  return str;
  }

• 小写转大写
  -(NSString *)stringToUpper:(NSString *)str{
  for (NSInteger i = 0; i < str.length; i++) {
  if ([str characterAtIndex:i] >= 'a' & [str characterAtIndex:i] <= 'z') {
  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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