Json SBJSON错误-对NSDictionary感到困惑

Question

Hi I am new to programming.

I have some issues with NSDictionary and Table cells. I Tried to find good tutorials, but did not find anything that could help me. I am using JSONKit to parse json. I have an older version of xcode and only have simulator 4.3.

What i would like to do is to parse my Json into a table with cells.

The json I want to parse:

{[{"n_id":"1","name":"Green","age":"23"}]}

My main problem. I dont get any errors, but when i run the app it just close automatically. When i comment out //cell.textLabel.text = [studName objectAtIndex:indexPath.row]; and replace it with just cell.textLabel.text = @"Test"; The app and the output works fine. I am also able to get the NSLog(); values

I think my error is in the cell.textLabel.text = [studName objectAtIndex:indexPath.row]; Thanks in advance

//Json2ViewController.m

- (void)viewDidLoad {
[super viewDidLoad];



NSData * JSONdata =[[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:@"http://myurl.php"]];

 if([JSONdata length] == 0){
 [JSONdata release];
 return;
 }

NSArray *students =[JSONdata objectFromJSONData];

studName = [[NSMutableArray alloc] init];

for(NSDictionary *student in students)
{
    NSLog(@"Name: %@", [student objectForKey:@"name"]);
    NSLog(@"Age: %@", [student objectForKey:@"age"]);

    content = [student objectForKey:@"name"];
    if(content)
       [studName addObject:content];

}

}


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


    - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
    cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];
}

// Configure the cell...
cell.textLabel.text = [studName objectAtIndex:indexPath.row];
return cell;

}

I am not sure about NSMutableArray.

//Json2ViewController.h

@interface Json2ViewController : UIViewController {
NSArray * list;
NSString * content;
NSMutableArray *studName;

}

Answer 1

Try this:

 //Declare NSMutableArray *studName= [[NSMutableArray alloc] init]; in your .h file.
// 3. iterate the array; each element is a dictionary...


 for (NSDictionary *results in list)
    {
        // 3 ...that contains a string for the key "stunde"
        content = [results objectForKey:@"n_name"];
        if(content)
            [studName addObject:content];
    }  

and in table delegate method cell for row at index

  // Configure the cell...
            cell.textLabel.text = [studName objectAtIndex:indexPath.row];