具有单个字典的 NSInvalidArgumentException

Question

我正在尝试将 NSDictionary 数据放入 tableView。但是当只有一个值时我遇到了问题。

在这里，有一个"upload"计数returns 8（但它应该return 1）如果有多个"upload"计数returns 第一种情况下应该是 "upload" 的数量。

NSDictionary *jsonDictionary = aDicLog;
NSMutableArray *tableData = jsonDictionary[@"multimedia"][@"uploads"][@"upload"];

int count = [tableData count];
NSLog(@"COUNT: %i", count);

Table

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [tableData count];
}

单元格

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{      
   //App Crashes in this line 
   NSDictionary *ldUpload = [tableData objectAtIndex:indexPath.row];
   ...
   return cell;
}

异常，有一个 "upload":

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSDictionaryM objectAtIndex:]: unrecognized selector sent to instance

字典是这样的：

这是应用程序崩溃的情况：（只有一个 "upload"）

Printing description of tableData:
{
    FileName =     {
        text = "IMG_0510.MOV";
    };
    status =     {
        text = 2;
    };
    Event =     {
        text = Q;
    };
    Date =     {
        text = "9/9/2016 11:01:58 AM";
    };
    Publicacion =     {
        text = "Example";
    };
    Seccion =     {
        text = Sistemas;
    };
    idMultimedia =     {
        text = 1136;
    };
    text = "";
}

以下是该应用运行良好的情况：（超过一个 "upload"）

Printing description of tableData:
<__NSArrayM 0x7a49dc90>(
{
    FileName =     {
        text = "1-FB5A9792.MOV";
    };
    status =     {
        text = 4;
    };
    Event =     {
        text = Test;
    };
    Date =     {
        text = "9/7/2016 9:06:21 AM";
    };
    Publicacion =     {
        text = "Example";
    };
    Seccion =     {
        text = Sistemas;
    };
    idMultimedia =     {
        text = 993;
    };
    text = "";
},
{
    FileName =     {
        text = "2-FB5A9793.MOV";
    };
    status =     {
        text = 4;
    };
    Event =     {
        text = Test;
    };
    Date =     {
        text = "9/7/2016 9:06:21 AM";
    };
    Publicacion =     {
        text = "Example";
    };
    Seccion =     {
        text = Sistemas;
    };
    idMultimedia =     {
        text = 994;
    };
    text = "";
},...

我正在使用 XMLReader 将 XML 转换为 Dictionary，然后将上述数据传递给 tableData

XML

<multimedia>
  <uploads>
    <upload>
      <id>1136</id>
      <Date>9/9/2016 11:01:58 AM</Date>
      <FileName>IMG_0510.MOV</FileName>
      <status>2</status>
      <Publicacion>Example</Publicacion>
      <Seccion>Sistemas</Seccion>
      <Event>Q</Event>
    </upload>
  </uploads>
</multimedia>

当只有 1 个 "upload" 和 n 个 "upload" 时，我如何 return 1 而不是 8？

Answer 1

Swift版本：

只需检查数据是字典还是数组：

var tableData:[[String:AnyObject]]! = []

if let data = jsonDictionary[@"multimedia"][@"uploads"][@"upload"] as? [String:AnyObject] {
    print("Single upload data")
    tableData.append(data)
} else {
    if let data = jsonDictionary[@"multimedia"][@"uploads"][@"upload"] as? [[String:AnyObject]] {
        print("multiple upload data")
        tableData = data
    }
}

Answer 2

您可以检查对象类型，如果它是 Dictionary 或 NSArray，则在此基础上生成您的 tableData 数组。

id uploadsObj = jsonDictionary[@"multimedia"][@"uploads"][@"upload"];
if ([uploadsObj isKindOfClass:[NSDictionary class]]) {
    NSMutableArray *tableData = [NSMutableArray arrayWithObject:(NSDictionary*)uploadsObj];
}
else if ([uploadsObj isKindOfClass:[NSArray class]]) {
    NSMutableArray *tableData = [NSMutableArray arrayWithArray:(NSArray*)uploadsObj];
}

具有单个字典的 NSInvalidArgumentException

NSInvalidArgumentException having a single dictionary

objective-c

nsdictionary

uitableview

nsarray

ios