Iphone 带有JSON的Master Detail应用程序给出了未捕获的异常_NSCFDictionary objectAtIndexedSubscript

我想用JSON数据（已经过验证）填充一个master detail应用程序，并得到错误“uncaught exception\uu NSCFDictionary objectAtIndexedSubscript”。非常感谢

JSON文件：

{
    "Name": [
    "Entry 1 (Comment1) (Comment1b)",
    "Entry 2 (Comment2) ",
    "Entry 3 (Comment3) ",
    "Entry 4 (Comment4) (Comment4b)"
     ],
"URLs": [
    "http://www.myurl.com/%20(Comment1)%20(Comment1b)",
    "http://www.myurl.com/%20(Comment2)%20(Comment2b)",
    "http://www.myurl.com/%20(Comment3)%20(Comment3b)",
    "http://www.myurl.com/%20(Comment4)%20(Comment4b)"
    ]
}

@interface MasterViewController () {
    NSArray *_objects;
}
@end

- (void)viewDidLoad
{
    [super viewDidLoad];

    NSURL *url = [NSURL URLWithString:@"http://myurl.com/Data.json"];
    NSData *data = [NSData dataWithContentsOfURL:url];
    _objects = [NSJSONSerialization JSONObjectWithData:data options:0 error:NULL];
}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
     return _objects.count;
}

以下是我加载JSON文件的方式：

{
    "Name": [
    "Entry 1 (Comment1) (Comment1b)",
    "Entry 2 (Comment2) ",
    "Entry 3 (Comment3) ",
    "Entry 4 (Comment4) (Comment4b)"
     ],
"URLs": [
    "http://www.myurl.com/%20(Comment1)%20(Comment1b)",
    "http://www.myurl.com/%20(Comment2)%20(Comment2b)",
    "http://www.myurl.com/%20(Comment3)%20(Comment3b)",
    "http://www.myurl.com/%20(Comment4)%20(Comment4b)"
    ]
}

@interface MasterViewController () {
    NSArray *_objects;
}
@end

- (void)viewDidLoad
{
    [super viewDidLoad];

    NSURL *url = [NSURL URLWithString:@"http://myurl.com/Data.json"];
    NSData *data = [NSData dataWithContentsOfURL:url];
    _objects = [NSJSONSerialization JSONObjectWithData:data options:0 error:NULL];
}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
     return _objects.count;
}

我就是这样分析它的：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
    {
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];
    NSLog(@"_objects contains: %@", _objects);

    // # This following line creates the error:
    NSDictionary *object = _objects [indexPath.row];
    NSLog(@"object contains: %@", object);
    cell.textLabel.text = [object objectForKey: @"Name"];
    cell.detailTextLabel.text = [object objectForKey: @"URLs"];

    return cell;
}

---

您以错误的方式访问JSON字典。顶级对象是字典，但您将它们视为数组，并尝试通过indexPath.row加载它们

这样的方法应该可以奏效：

cell.textLabel.text = _objects[@"Name"][indexPath.row];
cell.detailTextLabel.text = _objects[@"URLs"][indexPath.row];

爆发时，看起来是这样的：

NSArray *nameArray = _objects[@"Name"];
NSArray *urlArray = _objects[@"URLs"];
cell.textLabel.text = nameArray[indexPath.row];
cell.detailTextLabel.text = urlArray[indexPath.row];

---

感谢@danielbeard的回复，但现在我在这两行上收到了一个编译器警告：“读取'NSArray*'类型的对象上未找到的dictionary元素的预期方法更改为NSDictionary类型谢谢@danielbeard，但这现在给了我“tableView DidSelectRowatineXpath”和“prepareForSegue”行中的错误：”“读取“NSDictionary*”类型的对象上未找到的数组元素的预期方法”您还必须更改这些相应的方法，以便它们使用与上述代码类似的方法（如果您尝试从

\u对象中读取内容

）。