Using NSMutableArray in TableViewController with JSON data - ios

Question

Good afternoon,
I'm trying to use a NSMutableArray in my TableViewController from a JSON output and I'm a little bit lost because currently I can store my JSON data in a NSMutableArray, and I have checked with a NSLog that the content is OK, but now I have to show that data in my TableViewController and that's when I'm lost.
I'm using an another example of TableViewController using NSArray but now I have to modify it for a NSMutableArray. If you can help me with some code or show me some examples or tutorials I will be much appreciated.
I know in my code maybe I have something wrong because I'm using an old example using only NSArray but I'm showing you because that's what I don't know how to do, I need to work with NSMutableArray and that's why I'm asking for your help.
How can I show a NSMutableArray in my TableViewController?
- (void)viewDidLoad
{
[super viewDidLoad];
[self fetchJson];
}
-(void)fetchJson {
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_async(queue, ^{
NSString * urlString = [NSString stringWithFormat:#"http://website.com/service.php"];
NSURL * url = [NSURL URLWithString:urlString];
NSData * data = [NSData dataWithContentsOfURL:url];
//NSError * error;
//NSMutableArray *json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
// I advice that you make your carModels mutable array and initialise it here,before start working with json
//self.carModels = [[NSMutableArray alloc] init];
NSMutableArray *carModels=[[NSMutableArray alloc]init];
NSMutableArray *carMakes=[[NSMutableArray alloc]init];
NSMutableArray *carImages=[[NSMutableArray alloc]init];
#try
{
NSError *error;
NSMutableArray* json = [NSJSONSerialization
JSONObjectWithData:data
options:NSJSONReadingMutableContainers|NSJSONReadingMutableLeaves
error:&error];
if (error)
{
NSLog(#"%#",[error localizedDescription]);
}
else
{
for(int i=0;i<json.count;i++)
{
NSDictionary * jsonObject = [json objectAtIndex:i];
NSString* imagen = [jsonObject objectForKey:#"imagen"];
[carImages addObject:imagen];
NSDictionary * jsonObject2 = [json objectAtIndex:i];
NSString* user = [jsonObject2 objectForKey:#"user"];
[carMakes addObject:user];
NSDictionary * jsonObject3 = [json objectAtIndex:i];
NSString* images = [jsonObject3 objectForKey:#"date"];
[carModels addObject:images];
}
}
}
#catch (NSException * e)
{
NSLog(#"Exception: %#", e);
}
#finally
{
NSLog(#"finally");
// That's showing the data "1, 2, 3".
NSLog(#"models: %#", carModels);
NSLog(#"makes: %#", carMakes);
NSLog(#"images: %#", carImages);
}
}
);
}
- (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.carModels count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"carTableCell";
CarTableViewCell *cell = [tableView
dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[CarTableViewCell alloc]
initWithStyle:UITableViewCellStyleDefault
reuseIdentifier:CellIdentifier];
}
// Configure the cell...
cell.makeLabel.text = [_carMakes objectAtIndex: [indexPath row]];
cell.modelLabel.text = [self.carModels objectAtIndex:[indexPath row]];
UIImage *carPhoto = [UIImage imageNamed: [self.carImages objectAtIndex: [indexPath row]]];
cell.carImage.image = carPhoto;
return cell;
}
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([[segue identifier] isEqualToString:#"ShowCarDetails"])
{
CarDetailViewController *detailViewController =
[segue destinationViewController];
NSIndexPath *myIndexPath = [self.tableView
indexPathForSelectedRow];
detailViewController.carDetailModel = [[NSArray alloc]
initWithObjects: [self.carMakes
objectAtIndex:[myIndexPath row]],
[self.carModels objectAtIndex:[myIndexPath row]],
[self.carImages objectAtIndex:[myIndexPath row]],
nil];
}
}
Thanks.

Answer 1

Declare NSMutableArray *jsonArray ; as global
-(void)fetchJson {
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_async(queue, ^{
NSString * urlString = [NSString stringWithFormat:#"http://website.com/service.php"];
NSURL * url = [NSURL URLWithString:urlString];
NSData * data = [NSData dataWithContentsOfURL:url];
//NSError * error;
//NSMutableArray *json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
// I advice that you make your carModels mutable array and initialise it here,before start working with json
//self.carModels = [[NSMutableArray alloc] init];
#try
{
NSError *error;
[jsonArray removeAllObjects];
jsonArray = [NSJSONSerialization
JSONObjectWithData:data
options:NSJSONReadingMutableContainers|NSJSONReadingMutableLeaves
error:&error];
}
#catch (NSException * e)
{
NSLog(#"Exception: %#", e);
}
#finally
{
[self.tableView reloadData]
}
}
);
}
To Display The TableView Like This
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
return [jsonArray count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"carTableCell";
CarTableViewCell *cell = [tableView
dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[CarTableViewCell alloc]
initWithStyle:UITableViewCellStyleDefault
reuseIdentifier:CellIdentifier];
}
// Configure the cell...
cell.makeLabel.text = [[jsonArray objectAtIndex:indexPath.row] valueForKey:#"imagen"];
cell.modelLabel.text = [[jsonArray objectAtIndex:indexPath.row] valueForKey:#"user"];
UIImage *carPhoto = [[jsonArray objectAtIndex:indexPath.row] valueForKey:#"date"];
cell.carImage.image = carPhoto;
return cell;
}

Answer 2

Add
[self.tableView reloadData]
after you have fetched and parsed the JSON.

Answer 3

Whenever you change table datas from different array just add [self.tableView reloadData] in you method.
It will remove old data & shows new data into your tableview.