CODEWITHSUNDEEP
iosuitableview
brianhevans
brianhevans

Reputation: 1193

UITableView not loading but array is populated

I have a UITableView that I would like to populate with data via a WebAPI. I have everything set up and I can verify that data is returned in JSON format. What I don't understand is why I see that data in my array printed out several times when I use NSLog and also how do I assign this data to the UITableView. I was able to populate the table from the viewDidLoad method but these are hard-coded values. I want to populate the grid with data that is returned from my call to the remote server. This data is available to me in my didReceiveData delegate. What am I doing wrong here?

I have this code in my MasterViewControler.h

@interface MasterViewController : UITableViewController <UITableViewDataSource, UIAlertViewDelegate> {

NSMutableArray *dataArray;
NSMutableArray *categoryNames;

}

Here is an abridged version of what I have in my MasterViewController.m file

NSMutableData* receivedData;
NSString* hostName;
NSInteger portNumber = 9999;
NSMutableDictionary* dictionary;
NSInteger maxRetryCount = 5;
int count = 0;

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {

NSLog(@"Succeeded! Received %d bytes of data",[data length]);
NSError *error = nil;
// Get the JSON data from the website

id result = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];

if ([result isKindOfClass:[NSArray class]]) {

    for (NSArray *item in result)
        [dataArray addObject:item];

    NSLog(@"%@", dataArray);
}
else {
    NSDictionary *jsonDictionary = (NSDictionary *)result;

    for(NSDictionary *item in jsonDictionary)
        NSLog(@"Item: %@", item);
}}

- (void)viewDidLoad{
[super viewDidLoad];

hostName = [[NSString alloc] initWithString:@"12.34.56.78"];

NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"http://%@:%i%@", hostName, portNumber, @"/api/products"]];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL: url cachePolicy: NSURLRequestReloadIgnoringLocalCacheData timeoutInterval: 2]; 

NSURLConnection *connection = [NSURLConnection connectionWithRequest:request delegate:self];
[connection start];

// Do any additional setup after loading the view, typically from a nib.
self.navigationItem.leftBarButtonItem = self.editButtonItem;

UIBarButtonItem *addButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(addNewItem)];  //insertNewObject
self.navigationItem.rightBarButtonItem = addButton;

dataArray = [[NSMutableArray alloc] init];
//[dataArray addObject:@"Apple"];
//[dataArray addObject:@"Mango"];
//[dataArray addObject:@"Orange"];}

Instead of populating the dataArray here I was trying to populate it in the didReceiveData delegate. The dataArray will be allocated but it is almost like I have to reload the UITableView to see the values. I tried that at the end of didReceiveData but I received an error.

Upvotes: 0

Views: 876

Answers (2)

Scott Bossak
Scott Bossak

Reputation: 2501

First make sure your UITableViewDataSource and UITableViewDelegate are set.

Once the array is populated (in your case, at the end of -(void)connection:didReceiveData:) you'd call [tableView reloadData] to refresh the table.

Then you'd set your cell in:

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

    // If your array is an array of strings, change if applicable
    NSString *string = [dataArray objectAtIndex:indexPath.row];
    [cell.textLabel setText:string];

}

Upvotes: 2

Chris Trahey
Chris Trahey

Reputation: 18290

Your class should implement UITableView's UITableViewDataSource protocol, and then assign itself as the dataSource. Then implement cellForRowAtIndexPath:, which is where you actually use your model array to initialize the cells. When your data is ready, call reloadData on the table view.

Upvotes: 0

Related Questions