Can't reload data in tableView after parsing XML - ios

Question

I'm starting NSURLConnection, parsing XML, initialize array from this XML, and show it in the tableView. In connectionDidFinishLoading I'm trying [self.tableView reloadData, but it doesn't work. This is my code:
my .h file:
#interface catalogViewController : UITableViewController //
#property (nonatomic, strong) NSMutableData *receivedData;
#property (nonatomic,retain) NSArray * titleArr;
#property (nonatomic,retain) NSArray * contentArr;
#property (nonatomic,retain) NSArray * ImageURLArr;
#property (nonatomic,retain) NSArray * dateArr;
#property (nonatomic,retain) NSArray * priceArr;
#property (nonatomic,retain) NSDictionary * xmlDictionary;
#property (nonatomic,retain) NSArray * IDArr;
#property (nonatomic) BOOL * didDataLoaded;
#property (strong, nonatomic) IBOutlet UITableView *myTableView;
#end
My .m file:
#import "catalogViewController.h"
#import "XMLReader.h"
#interface catalogViewController ()
#end
#implementation catalogViewController
- (id)initWithStyle:(UITableViewStyle)style {
self = [super initWithStyle:style];
if (self) { } return self;
}
//-=-=-=-=-=-=-=-=-=-=--=-=-=-=-=-=-=-=-=-CONNECTIONS METHOD START-=-=-=-=-=-=-=-=-=--=-=-=-=-=-=-=-=-=-=-
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
[_receivedData setLength:0];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[_receivedData appendData:data];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
[connection release];
[_receivedData release];
NSString *errorString = [[NSString alloc] initWithFormat:#"Connection failed! Error - %# %# %#", [error localizedDescription], [error description], [[error userInfo] objectForKey:NSURLErrorFailingURLStringErrorKey]]; NSLog(#"%#",errorString);
[errorString release];
}
//-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-GET FULL DATA HERE-=-=-=-=-=-=-=-=--=-=-=-=-=-=-
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
NSString *dataString = [[NSString alloc] initWithData:_receivedData encoding:NSUTF8StringEncoding];
//-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-XMLPARSER PART START-=-=-=-=-=-=-=-=-=-=-=-=-=-=- //
NSString *testXMLString = [NSString stringWithContentsOfURL:myURL usedEncoding:nil error:nil];
// -=-=-=-=-=-=-=-=-=-=Parse the XML into a dictionary-=-=-=-=-=-=-=-=-=-=
NSError *parseError = nil;
_xmlDictionary = [XMLReader dictionaryForXMLString:testXMLString error:&parseError];
//-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-XMLPARSER PART END-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
_titleArr =[[[_xmlDictionary objectForKey:#"result"] objectForKey:#"name"] valueForKey:#"text"];
_IDArr =[[[_xmlDictionary objectForKey:#"result"] objectForKey:#"id"] valueForKey:#"text"];
_priceArr=[[[_xmlDictionary objectForKey:#"result"] objectForKey:#"price"] valueForKey:#"text"];
_ImageURLArr=[[[_xmlDictionary objectForKey:#"result"] objectForKey:#"img"] valueForKey:#"text"];
[connection release];
[_receivedData release];
[dataString release];
_didDataLoaded=TRUE;
[_myTableView reloadData]; // IBOutlet property
[self.tableView reloadData]; //default
}
//-=-=-=-=-=-=-=-=-=-=-Connection methods END-=-=-=-=-=-=-=-=-=-
- (void)viewDidLoad {
[super viewDidLoad];
_didDataLoaded=FALSE;
//-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-XMLPARSER PART START-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//-=-==-=-=-=-=-=-=-=-=-=-=--=-=START Shit with connection-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-=
NSString* params = #"request_params";
NSURL* url = [NSURL URLWithString:#"my URL"];
NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:15.0];
[request addValue:#"text/xml; charset=utf-8" forHTTPHeaderField:#"Content-Type"];
request.HTTPMethod = #"POST";
request.HTTPBody = [params dataUsingEncoding:NSUTF8StringEncoding];
NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
if (connection) {
NSLog(#"Connecting...");
_receivedData = [[NSMutableData data] retain];
} else {
NSLog(#"Connecting error");
}
}
//-=-==-=-=--=-==-=-=-=-=-=--=-==---=-=--==-=-=-=-=-TableView methods-=-=-=-=-=-=-=-=-=-=-=-=--=-=-=--=-=-=-=-=-=-=
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
if (_didDataLoaded == FALSE) {
return 1;
}
else return self.titleArr.count;
}
-(NSInteger) numberOfSectionsInTableView:(UITableView *)tableView { return 1; }
-(UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"creatures"];
UIImage *creatureImage = nil;
if (_didDataLoaded == FALSE) {
cell.textLabel.text=#"Downloading...";
cell.detailTextLabel.text= #"downloading...";
} else {
cell.textLabel.text = [self.titleArr objectAtIndex:indexPath.row];
cell.detailTextLabel.text= _IDArr[indexPath.row];
NSString *img = self.ImageURLArr[indexPath.row];
creatureImage =[[UIImage alloc] initWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:img]]]; cell.imageView.image = creatureImage;
}
return cell;
}
#end
XML downloading - OK, parsing - OK, initialising arrays - OK. But when I start project I have exception on the line NSLog(#"%#", self.titleArr objectAtIndex:indexPath.row]; - says: "Thread 1: EXC_BAD_ACCESS (code 1)
How can I understand it's means that it's trying initialize array when it's not prepare. My problem is i can't delay tableView methods or what? How can i fix it? I'm trying fix itfor some days...

Answer 1

Your titleArr is deallocated from memory and then you are requesting object of it so it is giving you a crash. So allocate memory to array by this way.
_titleArr = [[NSArray alloc] initWithArray:[[[_xmlDictionary objectForKey:#"result"] objectForKey:#"name"] valueForKey:#"text"]];

Answer 2

Eventhough it's not recommended way but the following can provide a solution to you
self.tableView.delegate = nil;
self.tableView.datasource = nil;
and when safely your array was populated with the xml data set back to
self.tableView.delegate = self;
self.tableView.datasource = self;