Question

我们有json文件（content.json）。我们需要获取数据表单.json文件，然后放入NSMutablearray。我们试过这个

 NSString* path  = [[NSBundle mainBundle] pathForResource:@"content" ofType:@"json"];

NSString* jsonString = [[NSString alloc] initWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];

 NSData* jsonData = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
NSArray *jsonArray = [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:nil];

   id allKeys = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONWritingPrettyPrinted error:&jsonError];
NSLog(@"Key ***  %@",allKeys);

    for (int i=0; i<[allKeys count]; i++) {
        NSDictionary *arrayResult = [allKeys objectAtIndex:i];
        NSLog(@"name=%@",[arrayResult objectForKey:@"Description"]);

    }

allKeys值为空

JsonString is


    [
          {
          "ID": “2”,
          "MessageType": "0",
          "Description": "Promotions”,
          "ExpiryDateTime": "2015-07-10 12:00:00", 
          "Html": "<div class=\"ad_box\"><img class=\"banner\" src=\"jewellery.jpg\"\/><h3>"Hot" Items<ul \/><\/div>"
          },
          {
          "ID": "4",
          "MessageType": "1",
          "Description": "Offers”,
          "ExpiryDateTime": "2015-07-09 2:00:00", 
          "Html": "<div class=\"ad_box\"><img class=\"banner\" src=\"Williams-Petersan.jpg\"\/><h3>"Hot" Items - 2<ul \/><\/div>"
           }
           {
           "ID": “6”,
          "MessageType": “2”,
          "Description": "Invitations”,
          "ExpiryDateTime": "2015-07-09 3:00:00", 
          "Html": "<div class=\"ad_box\"><img class=\"banner\" src=\"Puma.jpg\"\/><h3>"Hot" Items - 2<ul \/><\/div>"
           }
]

我们需要将描述数据放入ArrayResult

请指导我们

Answer 1

您的json无效 - 请注意ID 2或6周围的unicode引号 - ID 4很好 - 有多个错误，可以轻松修复:)例如通过使用一些在线儿子验证器网站/支持的编辑器

代码本身看起来没问题

<强> BUT

它不会是一个可变数组;）它将是不可变的。如果您想要Mutability，请将NSJSONReadingMutableContainers传递给JSON

Answer 2

您不需要在NSString之前制作NSData。只需使用类方法dataWithContentsOfFile:即可。要使数组可变，只需在序列化时添加命令mutableCopy：

NSString* path  = [[NSBundle mainBundle] pathForResource:@"content" ofType:@"json"];
NSData* jsonData = [NSData dataWithContentsOfFile:path];
id allKeys = [[NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingMutableContainers error:nil]mutableCopy];
NSLog(@"Key ***  %@", allKeys);

for (int i=0; i<[allKeys count]; i++) {
    NSDictionary *arrayResult = [allKeys objectAtIndex:i];
    NSLog(@"name = %@",[arrayResult objectForKey:@"Description"]);
}

这是正确的json数据，可以使用代码：

[
    {
        "ID": "2",
        "MessageType": "0",
        "Description": "Promotions",
        "ExpiryDateTime": "2015-07-10 12:00:00",
        "Html": "<div class=\"ad_box\"><img class=\"banner\" src=\"jewellery.jpg\"\/><h3>\"Hot\" Items<ul \/><\/div>"
    },
    {
        "ID": "4",
        "MessageType": "1",
        "Description": "Offers",
        "ExpiryDateTime": "2015-07-09 2:00:00",
        "Html": "<div class=\"ad_box\"><img class=\"banner\" src=\"Williams-Petersan.jpg\"\/><h3>\"Hot\" Items - 2<ul \/><\/div>"
    },
    {
        "ID": "6",
        "MessageType": "2",
        "Description": "Invitations",
        "ExpiryDateTime": "2015-07-09 3:00:00",
        "Html": "<div class=\"ad_box\"><img class=\"banner\" src=\"Puma.jpg\"\/><h3>\"Hot\" Items - 2<ul \/><\/div>"
    },

]

json到Objective-C中的nsmutablearray

2 个答案: