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POiOS crashes with EXC_BAD_ACCESS(code=1)
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copied!<p>I'm new to iOS, so don't be shy about pointing out any of my code that looks completely idiotic :)</p> <p>Here goes...</p> <p>Two view controllers - OrderViewController and LineItemViewController - when the user is on LineItemViewController, they can click a "Scan" button that sends a request to the server to mark this item as scanned. That seems to work fine, but I get this error in the console app:</p> <p>5/19/13 11:28:04.044 AM EvoScanner: tcp_connection_destination_fail net_helper_connect_fail failed</p> <p>The app still runs fine after getting that error. The issue is when I click "Back" to return to the OrderViewController, the app crashes with EXC_BAD_ACCESS(code=1). </p> <p>I'm using XCode 4.6.2 with ARC enabled. </p> <p>Here's my LineItemViewController: </p> <pre><code>// Interface #import <UIKit/UIKit.h> #import "LineItemModel.h" @interface LineItemViewController : UIViewController @property (strong, nonatomic) LineItemModel* _line_item; -(void)setDetailItem:(LineItemModel *) lineItem; @property (strong, nonatomic) IBOutlet UIButton *scanButton; - (IBAction)scanItem:(id)sender; @property (strong, nonatomic) IBOutlet UILabel *itemLabel; -(IBAction)scanItem; @end // Implementation #import "LineItemViewController.h" #import "LineItemModel.h" #import "HUD.h" #import "JSONModelLib.h" @interface LineItemViewController () { LineItemModel *_line_item; } @end @implementation LineItemViewController - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; if (self) { // Custom initialization } return self; } - (void)viewDidLoad { [super viewDidLoad]; self.itemLabel.text = _line_item.product_title; // Do any additional setup after loading the view. } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } -(void)setDetailItem:(id)lineItem { if(_line_item != lineItem) { _line_item = lineItem; [self configureView]; } } - (void)configureView { // Update the user interface for the detail item. if (self._line_item) { // self.detailDescriptionLabel.text = [self.detailItem description]; } } - (IBAction)scanItem:(id)sender { NSLog(@"Scanning!"); NSString *string_url = [NSString stringWithFormat:(NSString *)@"%@/%@", @"http://localhost:3000/api/scan_item", _line_item.id ]; NSURL *url = [NSURL URLWithString:string_url]; NSMutableURLRequest *theRequest = [NSMutableURLRequest requestWithURL:url]; NSString *messageBody = [NSString stringWithFormat:@"status=%@",@1]; NSString *msgLength = [NSString stringWithFormat:@"%d", [messageBody length]]; [theRequest setHTTPMethod:@"POST"]; [theRequest addValue: msgLength forHTTPHeaderField:@"Content-Length"]; [theRequest setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"]; [theRequest setHTTPBody:[messageBody dataUsingEncoding:NSUTF8StringEncoding]]; NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self]; if(theConnection) { NSLog(@"Connection Successful"); //receivedData = [[NSMutableData data] retain]; } else { NSLog(@"There was an error: "); // UIAlertView *alert1 = [[[UIAlertView alloc] initWithTitle:@"Alert" message:@"There was an issue sending the data. Please check your internet connection." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil] autorelease]; // [alert1 show]; } } @end </code></pre> <p>And the OrderViewController:</p> <pre><code>// Interface #import <UIKit/UIKit.h> #import "OrderModel.h" @interface OrderViewController : UITableViewController @property (strong, nonatomic) OrderModel* _order; @property (strong, nonatomic) id detailItem; @end // Implementation #import "OrderViewController.h" #import "OrderModel.h" #import "LineItemModel.h" #import "LineItemCell.h" #import "HUD.h" #import "JSONModelLib.h" #import "LineItemViewController.h" @interface OrderViewController () { OrderModel* _order; NSMutableArray* listOfItems; } @end @implementation OrderViewController -(void)viewDidAppear:(BOOL)animated { NSLog(@"View did appear"); // show loader view //[HUD showUIBlockingIndicatorWithText:@"Fetching order"]; //Initialize the array. listOfItems = [[NSMutableArray alloc] init]; NSMutableArray *unPackedArray = [NSMutableArray array]; NSMutableArray *packedArray = [NSMutableArray array]; NSLog(@"ORDER: %@", _order); for(int i = 0; i < _order.line_items.count; i++) { NSLog(@"object in for loop: %@", _order.line_items[i]); LineItemModel *li = _order.line_items[i]; if (li.qty_packed != li.quantity) { [unPackedArray addObject:(LineItemModel *)_order.line_items[i]]; } else { [packedArray addObject:(LineItemModel *)_order.line_items[i]]; } } NSLog(@"unpacked array: %@", unPackedArray); NSLog(@"packed array: %@", packedArray); NSDictionary *unPackedDict = [NSDictionary dictionaryWithObject:unPackedArray forKey:@"LineItems"]; NSDictionary *packedDict = [NSDictionary dictionaryWithObject:packedArray forKey:@"LineItems"]; [listOfItems addObject:unPackedDict]; [listOfItems addObject:packedDict]; // TODO: set the order id from the selected cell here [self.tableView reloadData]; self.navigationItem.title = _order.customer_name; } - (void)setDetailItem:(id)newDetailItem { NSLog(@"MAKE DETAIL ITEM"); if (_order != newDetailItem) { _order = newDetailItem; // Update the view. [self configureView]; } // show loader view [HUD showUIBlockingIndicatorWithText:@"Fetching order"]; NSString *order_id = _order.id; NSString *url = [NSString stringWithFormat:(NSString *)@"%@/%@.%@", @"http://localhost:3000/api/order", order_id, @"json" ]; _order = [[OrderModel alloc] initFromURLWithString:url completion: ^(JSONModel *model, JSONModelError *err) { // hide loader view [HUD hideUIBlockingIndicator]; [self.tableView reloadData]; }]; } - (void)configureView { // Update the user interface for the detail item. if (_order) { // self.detailDescriptionLabel.text = [self.detailItem description]; } } - (id)initWithStyle:(UITableViewStyle)style { self = [super initWithStyle:style]; if (self) { // Custom initialization } return self; } - (void)viewDidLoad { NSLog(@"View DID LOAD"); [super viewDidLoad]; // Uncomment the following line to preserve selection between presentations. // self.clearsSelectionOnViewWillAppear = NO; // Uncomment the following line to display an Edit button in the navigation bar for this view controller. // self.navigationItem.rightBarButtonItem = self.editButtonItem; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } #pragma mark - Table view data source - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { #warning Potentially incomplete method implementation. // Return the number of sections. One for Packed items, one for items not packed. return [listOfItems count]; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { // Return the number of rows in the section. NSDictionary *dictionary = [listOfItems objectAtIndex:section]; NSArray *array = [dictionary objectForKey:@"LineItems"]; return [array count]; } -(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { // NSLog(@"ORDER IN LINEITEM CELL: %@", _order); // NSLog(@"LINEITEM: %@", line_item); // New view code with subclass LineItemCell *cell = (LineItemCell *)[tableView dequeueReusableCellWithIdentifier:@"LineItemCell"]; if (!cell) { cell = [[LineItemCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"LineItemCell"]; } // Get the Line Item object for this row and section NSDictionary *dictionary = [listOfItems objectAtIndex:indexPath.section]; NSArray *array = [dictionary objectForKey:@"LineItems"]; LineItemModel* line_item = [array objectAtIndex:indexPath.row]; cell.productLabel.text = line_item.product_title; cell.variantLabel.text = line_item.variant_title; int remaining = line_item.quantity - line_item.qty_packed; cell.remainingLabel.text = [NSString stringWithFormat:@"%i", remaining]; // NSLog(@"LINE ITEM CELL: %@", cell); return cell; } - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section { if(section == 0) return @"Unpacked Items"; else return @"Packed Items"; } /* // Override to support conditional editing of the table view. - (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath { // Return NO if you do not want the specified item to be editable. return YES; } */ /* // Override to support editing the table view. - (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath { if (editingStyle == UITableViewCellEditingStyleDelete) { // Delete the row from the data source [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade]; } else if (editingStyle == UITableViewCellEditingStyleInsert) { // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view } } */ /* // Override to support rearranging the table view. - (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath { } */ /* // Override to support conditional rearranging of the table view. - (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath { // Return NO if you do not want the item to be re-orderable. return YES; } */ #pragma mark - Table view delegate - (void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender { NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow]; NSDictionary *dictionary = [listOfItems objectAtIndex:indexPath.section]; NSArray *array = [dictionary objectForKey:@"LineItems"]; LineItemModel *li = [array objectAtIndex:indexPath.row]; NSLog(@"Line Item in final: %@", li); LineItemViewController *vc = [segue destinationViewController]; [vc setDetailItem:li]; } - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { // Navigation logic may go here. Create and push another view controller. /* <#DetailViewController#> *detailViewController = [[<#DetailViewController#> alloc] initWithNibName:@"<#Nib name#>" bundle:nil]; // ... // Pass the selected object to the new view controller. [self.navigationController pushViewController:detailViewController animated:YES]; */ } @end </code></pre> <p>UPDATE: After setting breakpoints for all exceptions, the trace leads me to:</p> <pre><code>#import <UIKit/UIKit.h> #import "EvoAppDelegate.h" int main(int argc, char *argv[]) { @autoreleasepool { // Breakpoint leads to this line // Thread 1: EXC_BAD_ACCESS(code=1, ...) return UIApplicationMain(argc, argv, nil, NSStringFromClass([EvoAppDelegate class])); } } </code></pre>

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