Sending data from Google Places API to tableview - ios

Question

How send data to tableview in iOS with objective-C? I am trying to solve my problem very long time but result is not correct. My tableview is still empty. What I'm doing wrong? Below is my implementation file.
import "PlacesViewController.h"
#implementation PlacesViewController
#synthesize places;
- (void)viewDidLoad
{
[super viewDidLoad];
// Set this view controller object as the delegate and data source for the table view
self.listTableView.delegate = self;
self.listTableView.dataSource = self;
}
-(void)queryGooglePlaces
{
//Build the url string to send to Google
NSString *url = [NSString stringWithFormat:#"https://maps.googleapis.com/maps/api/place/nearbysearch/json?location=51.503186,-0.126446&radius=5000&types=food#|restaurant|bar&keyword=vegetarian&key=myOwnKEY"];
url = [url stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSLog(#"%#", url);
//Formulate the string as a URL object.
NSURL *googleRequestURL=[NSURL URLWithString:url];
// Retrieve the results of the URL.
dispatch_async(kBgQueue, ^{
NSData* data = [NSData dataWithContentsOfURL: googleRequestURL];
dispatch_sync(dispatch_get_main_queue(), ^{
[self fetchedData:data];
});
});
}
-(void)fetchedData:(NSData *)responseData {
//parse out the json data
NSError* error;
NSDictionary* json = [NSJSONSerialization
JSONObjectWithData:responseData
options:kNilOptions
error:&error];
//The results from Google will be an array obtained from the NSDictionary object with the key "results".
self.places = [json objectForKey:#"results"];
//Write out the data to the console.
NSLog(#"Google Data: %#", json);
}
#pragma mark - Table view data source
- (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 [self.places count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
NSDictionary *tempDictionary= [self.places objectAtIndex:indexPath.row];
cell.textLabel.text = [tempDictionary objectForKey:#"name"];
return cell;
}
#end

Answer 1

Whenever you update the datasource, you need to call [self.tableView reloadData]
So it should be like this
-(void)fetchedData:(NSData *)responseData {
//parse out the json data
NSError* error;
NSDictionary* json = [NSJSONSerialization
JSONObjectWithData:responseData
options:kNilOptions
error:&error];
//The results from Google will be an array obtained from the NSDictionary object with the key "results".
self.places = [json objectForKey:#"results"];
// NOTE - ADDED RELOAD
[self.tableView reloadData];
//Write out the data to the console.
NSLog(#"Google Data: %#", json);
}
For more information about reloadData see the answer

Answer 2

After you update the data source you should reload the table view.
self.places = [json objectForKey:#"results"];
[self.tableView reloadData];