ios中字符串中包含某个字符串的个数

//循环方法
///核心思想是找到相同字符串就对字符串进行截取，然后对剩余字符串进行

• (NSInteger)getCountFrom:(NSString)allStr with:(NSString)cutStr{
  //空的时候直接返回0
  if (allStr.length == 0) {
  return 0;
  }
  //接下来是处理字符串
  NSString *leftStr = allStr;
  NSInteger includeCount = 0;
  //显得我严谨，其实这里循环条件无所谓
  while (leftStr.length >= cutStr.length) {
  NSRange range = [leftStr rangeOfString:cutStr];
  if (range.location != NSNotFound) {
  includeCount += 1;
  leftStr = [leftStr substringFromIndex:range.location + range.length];
  }else{
  return includeCount;
  }
  }
  return includeCount;
  }

//递归方法
///核心思想是找到相同字符串就对字符串进行截取，然后对剩余字符串进行

• (NSInteger)getCountFrom1:(NSString)allStr with:(NSString)cutStr{
  static NSInteger includeCount = 0;
  //直接处理字符串
  if (allStr.length < cutStr.length) {
  return includeCount;
  }
  NSRange range = [allStr rangeOfString:cutStr];
  if (range.location != NSNotFound) {
  includeCount += 1;
  [self getCountFrom1:[allStr substringFromIndex:range.location + range.length] with:cutStr];
  }else{
  return includeCount;
  }
  return includeCount;
  }