JSON 递归遍历算法（IOS）_ios json递归-优快云博客

本文详细解析了一个用于解析JSON深度遍历的算法，通过逐步分析JSON字符串中的字符，实现对JSON对象和数组的层级遍历，展示了如何根据不同类型的字符进行逻辑判断和处理。

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调用时深度的default值为0

-(void)testPetch:(NSString*) json forDeep:(int) level

{
     NSString * result = @"" ;
     NSString * prevChar = @"" ;
     NSUInteger slen = [json length ];
     BOOL needrec = NO ;

     NSString * lStr = @"" ;

    for ( int i=0; i < slen; i++) {
         NSString * sc = [json substringWithRange : NSMakeRange (i,1)];

         if ([sc isEqualToString : @"{" ] && (!needrec))
        {
             if ([result length ]>0) {
                 // delete left and right space
                [result stringByTrimmingCharactersInSet :[ NSCharacterSet whitespaceCharacterSet ]];
                if ([[result substringWithRange : NSMakeRange (0,1)] isEqualToString : @"," ])
                {
                    result = [result substringWithRange : NSMakeRange( 1,[result length]-1)];
                }
                 NSLog ( @"add (%d)deep json object :%@ " ,level,result);
                result = @"" ;
            }
             else
            {
                 NSLog ( @"add (%d)deep json object : object name is null" ,level);
            }

            lStr = [json substringWithRange : NSMakeRange (i+1,slen-i-1)];
            break ;
        }

        if ([sc isEqualToString : @"[" ] && (!needrec))
        {
             if ([result length ]>0) {
                 // delete left and right space
                [result stringByTrimmingCharactersInSet :[ NSCharacterSet whitespaceCharacterSet ]];
                if ([[result substringWithRange : NSMakeRange (0,1)] isEqualToString : @" ,"])
                {
                    result = [result substringWithRange : NSMakeRange (1,[result length]-1)];
                }
                 NSLog ( @"add (%d)deep json array : %@" ,level,result);
                result = @"" ;
            }
             else
            {
                 NSLog ( @"add (%d)deep json array : array name is null" ,level);
            }

            lStr = [json substringWithRange : NSMakeRange (i+1,slen-i-1)];
             break ;
        }

        if ([sc isEqualToString : @"}" ] && (!needrec))
        {
             NSLog ( @"Add (%d) a member%@" ,level,result);
            level = level -1;
            result = @"" ;
             continue ;
        }

        if ([sc isEqualToString : @"]" ] && (!needrec))
        {
             NSLog ( @"Add (%d) a array member%@" ,level,result);
            level = level -1;
            result = @"" ;
            continue ;
        }

         if ([sc isEqualToString : @"\"" ] && (![prevChar isEqualToString : @"\\" ]))
        {
            needrec = !needrec;
        }

        result = [result stringByAppendingFormat : @"%@" ,sc];

        prevChar = sc;

    }

// Loop