如何判断字符串重复出现个数

    NSString *str =@"Cheesecake, apple cake, and cherry pie";

    NSUInteger count =0, length = [strlength];

    NSRange range =NSMakeRange(0, length);

    while(range.location !=NSNotFound)

    {

        range = [str rangeOfString: @"cake" options:0range:range];

        if(range.location !=NSNotFound)

        {

           range = NSMakeRange(range.location + range.length, length - (range.location + range.length));

            count++;

        }

    }

    NSLog(@"%@ cake 出现的个数为-》 %d",NSStringFromRange(range),count);