Adding a new row in a UITableView - iphone

Question

HI Everyone,
It is my first post here and this is my problem:
I am trying to get some data from a REST API call and show then in a UITableView.
This s what I am doing:
in the viewDidLoad: 1) here I initialize my array of things to show in the Table (that is empty at the beginning) 2) the table is loaded (with 0 rows) and 3) then the HTTP async call is issued.
Done this I do my stuff with the HTTP Response and when ready I call the reloadData on my table. Here the strange happens.
numberOfRowsInSelection returns me the correct number of rows
but
tableView:cellForRowAtIndexPath:indexPath for the indexPath.row always returns me zero!
so no new row is added to the table.
- (void)doJSONRequest{
responseData = [[NSMutableData data] retain];
NSString *addr = [[NSString alloc] initWithFormat:#"http://localhost:8080/blabla/v1/items?count=10"];
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:addr]];
[[NSURLConnection alloc] initWithRequest:request delegate:self];
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
[addr release];
}
- (void)doJSONRequestWithURL:(NSString *)url{
responseData = [[NSMutableData data] retain];
NSString *addr = [[NSString alloc] initWithFormat:url];
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:addr]];
[[NSURLConnection alloc] initWithRequest:request delegate:self];
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
[addr release];
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
//NSLog(#"[%#] connection:didReceiveResponse %#",[self class], response);
[responseData setLength:0];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
//NSLog(#"[%#] connection:didReceiveData %#",[self class], data);
[responseData appendData:data];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
NSLog(#"[%#]",[NSString stringWithFormat:#"Connection failed: %#", [error description]]);
UIAlertView *alert = [[UIAlertView alloc] init];
[alert setTitle:#"NETWORK ERROR!"];
[alert setMessage:#"App will close"];
[alert setDelegate:self];
[alert addButtonWithTitle:#"Close"];
[alert show];
[alert release];
[alert show];
[alert release];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
//NSLog(#"[%#] connectionDidFinishLoading %#",[self class], connection);
[connection release];
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
[responseData release];
NSDictionary *res = [NSDictionary dictionaryWithDictionary:[responseString JSONValue]];
NSDictionary *tmp = [res valueForKey:#"reviews"];
tmp = [tmp valueForKey:#"reviews"];
NSEnumerator *e = [tmp objectEnumerator];
NSDictionary *tmp_review;
int i=0;
while (tmp_review = [e nextObject]) {
//NSLog(#"tmp_review %#", tmp_review);
//NSLog(#"count %d", i++);
MyObject r = [... doing my staff...]
[reviews addObject: r];
[r release];
};
[reviewListTableView reloadData];
[responseString release];
}
- (void)viewDidLoad {
//- (void)initUI {
//review is the array where I put my data
//it is empty at the beginning
reviews = [[NSMutableArray alloc] initWithObjects:nil];
[super viewDidLoad];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [reviews count]
}

Answer 1

Sounds like you may not have properly implemented numberOfSectionsInTableView:. You should log indexPath.section in tableView:cellForRowAtIndexPath:indexPath to see what section value you are passing. You will have multiple indexPath.row values of zero because there is a zero row for each section.

Answer 2

add new object in the array and [mytableview reloadData];

Answer 3

Implement following data source return number of section to be present in the table view.
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView;
In tableView:cellForRowAtIndexPath:indexPath check section number and do your operation.
Note: If you don't need sections you can remove it.