ios - -[__NSCFDictionary objectAtIndex :]:

Question

救命!我已经为这个问题苦恼了 1 个小时了。

我正在我的 .h 文件中创建一个数组

    @interface LeftMenuViewController : UIViewController <UITableViewDataSource, UITabBarControllerDelegate>

@property (strong, nonatomic) MKNetworkOperation *myNetworkOperation;
@property (strong, nonatomic) NSArray *listOfClubsArray;

@end

然后，我从 JSON 格式的 API 调用中提取项目列表

///////////////////////////////////////////
#pragma mark Retreive List of Clubs / Teams
///////////////////////////////////////////

- (void)getListOfClubs {

    // Because we have a success from login auth we will now make a seperate call to gather club details

    self.myNetworkOperation = [app.teamManagerWrapper deviceID:@"adam" userToken:@"sdfdfgf" onCompletion:^(NSDictionary *result) {

        NSDictionary *data2 = [result objectForKey:@"data"];

        self.listOfClubsArray = [data2 objectForKey:@"user_clubs"];

        [self.tableView reloadData];

    } onError:^(NSError *error) {

        // error none

    }];

JSON 看起来像这样

{
    "code": 200,
    "data": {
        "user_clubs": {
            "5238": {
                "club_id": "45484",
                "name": "Testing This Club Name",
                "sport_id": "7",
                "primary_colour": "#000000",
                "secondary_colour": "#f15729",
                "members": null,
                "sections": {
                    "s": "Mens",
                    "j": "Junior",
                    "m": "Summer League",
                    "l": "Ladies"
                }

我的表格单元看起来像这样

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"ClubCell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell==nil) {
        cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
    }

    NSDictionary *tempDictionary= [self.listOfClubsArray objectAtIndex:indexPath.row];

    cell.textLabel.text = [tempDictionary objectForKey:@"name"];

    return cell;
}

这条线崩溃了

NSDictionary *tempDictionary= [self.listOfClubsArray objectAtIndex:indexPath.row];

使用此崩溃日志

2013-11-19 12:13:43.069 Manager App[11394:70b] -[__NSCFDictionary objectAtIndex:]: unrecognized selector sent to instance 0x8b0e9d0
2013-11-19 12:13:43.071 Manager App[11394:70b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFDictionary objectAtIndex:]: unrecognized selector sent to instance 0x8b0e9d0'
*** First throw call stack:

非常感谢任何帮助!!

Answer 1

在您的 JSON 示例中，没有俱乐部数组，而是字典，因此 objectAtIndex 将不起作用。

{
    "code": 200,
    "data": {
        "user_clubs": {
            "5238": {
            "club_id": "45484",
            "name": "Testing This Club Name",

在这里您可以看到 data/user_clubs 包含一个字典，如果您想要测试此俱乐部名称，您可以使用它的键来获取它:

 NSDictionary *tempDictionary= [self.listOfClubsArray objectForKey:@"5238"];

现在这不是您想要的，解决方案可能是:

NSArray *keys = [self.listOfClubsArray allKeys];
NSString *key = [keys objectAtIndex:indexPath.row];
NSDictionary *tempDictionary= [self.listOfClubsArray objectForKey:key];

但请确保您还告诉 UITableView 正确的键数并更改

@property (strong, nonatomic) NSArray *listOfClubsArray;

至

@property (strong, nonatomic) NSDictionary *listOfClubsArray;