Question

我有一个类似的数组。

    {"Hotweeks":[{"Image":"http://www.example.com/wp-content/uploads/0970E01L.jpg","Description":"Ocean Shores, WA","PostTitle":"Windjammer Condominiums"},
    {"Image":"","Description":"","PostTitle":"0970O01L"},
    {"Image":"","Description":"","PostTitle":"0970I08L"},
    {"Image":"","Description":"","PostTitle":"0970I06L"},
    {"Image":"","Description":"","PostTitle":"0970I04L"},
    {"Image":"","Description":"","PostTitle":"0970i03L"},
    {"Image":"","Description":"","PostTitle":"0970I02L"},
    {"Image":"","Description":"","PostTitle":"0970I01L"},
    {"Image":"","Description":"","PostTitle":"0970E02L"},
    {"Image":"","Description":"","PostTitle":"0970E01L"},
    {"Image":"http://www.example.com/wp-content/uploads/0936E01L.jpg","Description":"Manson, WA","PostTitle":"Wapato Point"},
    {"Image":"","Description":"","PostTitle":"0936O05L"},
    {"Image":"","Description":"","PostTitle":"0936O04L"},
    {"Image":"","Description":"","PostTitle":"0936O03L"},
    {"Image":"","Description":"","PostTitle":"0936O02L"},
    {"Image":"","Description":"","PostTitle":"0936O01L"},
    {"Image":"","Description":"","PostTitle":"0936I01L"},
    {"Image":"","Description":"","PostTitle":"0936E03L"},
    {"Image":"","Description":"","PostTitle":"0936E02L"},
    {"Image":"","Description":"","PostTitle":"0936E01L"}]}

我正在尝试使用以下代码进行解析。

NSArray *array = [NSJSONSerialization JSONObjectWithData:[returnString dataUsingEncoding:NSUTF8StringEncoding] options:NSJSONReadingMutableContainers error:&error];
        NSLog(@"Size of array is %ld",[array count]);


        NSDictionary *dictionary = [array objectAtIndex:0];
        NSString *test = [dictionary objectForKey:@"Image"];
        NSLog(@"Value for image is %@",test);

这在Nslog中返回null。

Answer 1

 …"Description":"Ocean Shores, WA,"PostTitle":…

在"之后缺少Ocean Shores, WA。它应该是

 …"Description":"Ocean Shores, WA","PostTitle":…

使用JSON验证程序检查此类事物。有很多可供选择。我使用的是Chrome应用JSON Lint和JSON编辑器。

Answer 2

Json文件的顶层是一个对象，而不是一个数组（它不以'['开头）。话虽这么说，如果你检查array这样的类型：NSLog("%@", [array class]你可能会看到它是一个NSDictionary。要获得阵列，您可以这样做：

NSDictionary *jsonDict = [NSJSONSerialization JSONObjectWithData:[returnString dataUsingEncoding:NSUTF8StringEncoding] options:NSJSONReadingMutableContainers error:&error];
NSArray *array = jsonDict[@"Hotweeks"];

NSLog(@"Size of array is %ld",[array count]);

NSDictionary *dictionary = [array objectAtIndex:0];
NSString *test = [dictionary objectForKey:@"Image"];
NSLog(@"Value for image is %@",test);

解析JSON数组返回空白数组

2 个答案: