JSON 格式有时不一样，如何从不同的 JSON 格式中提取信息？

Question

我正在使用它从 Youtube.

获取自动建议

http://suggestqueries.google.com/complete/search?hl=en&ds=yt&client=youtube&hjson=t&cp=1&q=Like&format=5&alt=json

["Tire",[["tired",0],["tired lyrics",0],["tired alan walker remix",0],["tired remix",0],["tired alan walker cover",0],["tired of being sorry enrique iglesias",0],["tire",0],["tired cover",0],["tiren mati kemaren full movie",0],["tired of talking",0]],{"k":1,"q":"raN20uYZUrouYBB7VsB396HlA88"}]

正如你从上面看到的从上面提取信息，我正在使用这段代码从 JSON array.

NSString *json = nil;
    NSScanner *scanner = [NSScanner scannerWithString:str];
    [scanner scanUpToString:@"[[" intoString:NULL]; // Scan to where the JSON begins
    [scanner scanUpToString:@"]]" intoString:&json];

    NSLog(@"json before = %@", json);
            //The idea is to identify where the "real" JSON begins and ends.
    json = [NSString stringWithFormat:@"%@%@", json, @"]]"];

但有时 JSON array 可能是这种格式，如下所示。

["Like",[["likey",0,[131]],["likey twice lyrics",0,[3]],["likey dance",0,[3]],["likey dance practice",0,[3]],["likey live",0,[3]],["like i\u0027m gonna lose you",0],["like ooh ahh",0],["like a boss",0],["like a g6",0],["like a stone",0]],{"k":1,"q":"9DuLDtNkAUfZ2X9AVZN90t0Zxlw"}]

我如何提取上面示例中的信息，如 likey、likey twice 歌词？

Answer 1

NSScanner 并不是将原始 JSON 转化为有用数据的最佳 API。

最好使用原生 JSON API NSJSONSerialization

id json = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];

这里的 json 对象可以转换为 NSArray。

其中数据是来自响应的原始数据。

另见 this answer

JSON 格式有时不一样，如何从不同的 JSON 格式中提取信息？

JSON format sometimes not same, how to extract the info from the different JSON format?

objective-c

arrays

json

string

nsscanner