ios – 使用字典解析JSON数组

概述我在 JSON文件中找到我想要的数据时遇到了一些麻烦.这是我的控制台输出的缩短版本： { AUD = { 15m = "125.15547"; 24h = "124.74"; buy = "121.0177"; last = "125.15547"; sell = "123.44883"; 我在 JSON文件中找到我想要的数据时遇到了一些麻烦.这是我的控制台输出的缩短版本：

{    AUD =     {        15m = "125.15547";        24h = "124.74";        buy = "121.0177";        last = "125.15547";        sell = "123.44883";        symbol = "$";    };    BRL =     {        15m = "120.34";        24h = "120.34";        buy = "120.34";        last = "120.34";        sell = "120.34";        symbol = "R$";    };    CAD =     {        15m = "129.08612";        24h = "131.07";        buy = "128.66227";        last = "129.08612";        sell = "129.08612";        symbol = "$";    };}

我正在尝试使用内置的JsON解析库来解析文件.这是我的vIEwDIDLoad方法中的解析器：

_tickerArray = [NSMutableArray array];    NSURL *tickerDataURL = [NSURL URLWithString:@"https://blockchain.info/ticker"];    NSData *JsonData = [NSData dataWithContentsOfURL:tickerDataURL];    NSError *error = nil;NSDictionary *dataDictionary = [NSJsONSerialization JsONObjectWithData:JsonData options:0 error:&error];    NSLog(@"%@",dataDictionary);    NSArray *ar = [NSArray arrayWithObject:dataDictionary];    for (Nsstring *key in [dataDictionary allKeys]) {        for (NSDictionary *dict in ar) {            TickerData *t;            t.currency = [dict objectForKey:key];            t.symbol = [dict objectForKey:@"symbol"];            t.last = [dict objectForKey:@"last"];            [_tickerArray addobject:t];        }    }

我想将货币代码(如AUD或BRL)与货币字典中包含的一些其他数据一起存储到t.currency中,但现在我的应用程序崩溃了.
错误代码：

NSinvalidargumentexception',reason: '*** -[__NSArrayM insertObject:atIndex:]: object cannot be nil

似乎没有任何对象被添加到_tickerArray中

帮帮我？

编辑：使用填充其他字段的正确数据显示键：

NSDictionary *dataDictionary = [NSJsONSerialization JsONObjectWithData:JsonData options:0 error:&error];    NSLog(@"%@",dataDictionary);    for (Nsstring *key in [dataDictionary allKeys]) {        NSDictionary *dic=[dataDictionary objectForKey:key];            TickerData *t=[[TickerData alloc] init];            t.currency = key;//EDITED            t.symbol = [dic objectForKey:@"symbol"];            t.last = [dic objectForKey:@"last"];            [_tickerArray addobject:t];    }

解决方法

NSDictionary *dataDictionary = [NSJsONSerialization JsONObjectWithData:JsonData options:0 error:&error];NSLog(@"%@",dataDictionary);//NSArray *ar = [NSArray arrayWithObject:dataDictionary];//REMOVEDfor (Nsstring *key in [dataDictionary allKeys]) {    NSDictionary *dic=[dataDictionary objectForKey:key];//ADDED    for (Nsstring *dickey in [dic allKeys]) { //MODIFIED        NSDictionary *dict=[dic objectForKey:dicKey];//ADDED        TickerData *t=[[TickerData alloc] init];//ALLOC INIT ?        t.currency = key;//EDITED        t.symbol = [dict objectForKey:@"symbol"];        t.last = [dict objectForKey:@"last"];        [_tickerArray addobject:t];    }}

您的数据不包含任何数组,其所有词典,请尝试上面的代码,请参阅注释..

希望它有效..

编辑：

是的,您也初始化了对象,如上面其他答案所示.

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