Parse links of a JSON file und download them - ios

Question

I want to create an App which parses the picture Links of a Facebook page and shows them in an iOS app (display them in tableView). But after I parsed the JSON file and added them to an array which should be downloaded nothing is displayed.
Here's the code:
- (void)viewDidLoad
{
self.edgesForExtendedLayout = UIRectEdgeNone;
[super viewDidLoad];
items = [[NSMutableArray alloc] init];
NSURL *url = [NSURL URLWithString:#"https://graph.facebook.com/HuppFotografie/photos/uploaded/?fields=id,name,picture"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
connection = [NSURLConnection connectionWithRequest:request delegate:self];
if (connection) {
webData = [[NSMutableData alloc]init];
}
}
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
[webData setLength:0];
}
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
[webData appendData:data];
}
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
NSLog(#"fail with error");
}
-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSDictionary *allDataDictionary = [NSJSONSerialization JSONObjectWithData:webData options:0 error:nil];
NSArray *arrayOfData = [allDataDictionary objectForKey:#"data"];
for (NSDictionary *dicton in arrayOfData) {
NSString *picture = [dicton objectForKey:#"picture"];
[items addObject:picture];
}
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
return 250.0;
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
return [items count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString *CellIdentifier = #"MyImageCell";
ImageCell *cell = (ImageCell *) [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
cell.backgroundColor = [UIColor clearColor];
if (cell == nil) {
NSArray* topLevelObjects = [[NSBundle mainBundle] loadNibNamed:#"ImageCell" owner:self options:nil];
for (id currentObject in topLevelObjects) {
if ([currentObject isKindOfClass:[UITableViewCell class]]) {
cell = (ImageCell *)currentObject;
break;
}
}
}
// Here we use the new provided setImageWithURL: method to load the web image
[cell.imageView setImageWithURL:[NSURL URLWithString:[items objectAtIndex:indexPath.row]] placeholderImage:[UIImage imageNamed:#"Placeholder.jpg"]];
cell.imageSource.text = [items objectAtIndex:indexPath.row];
return cell;
}
I really don't get why. I'm sorry if this question is stupid but I am coding just as a hobby and have not that great experience.

Answer 1

In fact your connection is asynchronous, so you just need to reload your table view programmatically to display loaded images:
-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSDictionary *allDataDictionary = [NSJSONSerialization JSONObjectWithData:webData options:0 error:nil];
NSArray *arrayOfData = [allDataDictionary objectForKey:#"data"];
for (NSDictionary *dicton in arrayOfData) {
NSString *picture = [dicton objectForKey:#"picture"];
[items addObject:picture];
}
// Just add this line, in order to force reload when all your data is arrived
[self.tableView reloadData];
}