UITableViewController application crashes - objective-c

Question

The UITableViewController freezes when scrolling or when viewDidAppear:. I see that when the problem starts, the app start to allocate objects uncontrollably.
I have the following project for iOS: basically download information from CoreData, but when I go to display the data in the table, the application freezes (both the device and the simulator). But if I show the arrangement in a downloaded NSLog no errors. The code is as follows:
I see that when the problem starts, the app start to allocate objects uncontrollably.
The UITableViewController freezes when scrolling or when viewDidAppear:
TableViewController.h
#interface Set_ScheduleViewController : UITableViewController
{
STCore *core;
UILabel *label;
NSArray *objects;
}
#end
TableViewController.m:
#implementation Set_ScheduleViewController
- (id)initWithStyle:(UITableViewStyle)style
{
self = [super initWithStyle:style];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
core = [[STCore alloc] init];
[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)reloadData
{
NSSortDescriptor *sort = [[NSSortDescriptor alloc] initWithKey:#"name" ascending:YES];
objects = [core getAllClassesUsingSortDescriptions:#[sort]];
[[self tableView] reloadData];
}
- (void)viewDidAppear:(BOOL)animated
{
[self reloadData];
[super viewDidAppear:animated];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
return [objects count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 120, 20)];
label.textColor = [UIColor colorWithHex:0x88B6DB];
label.font = [UIFont systemFontOfSize:12.0f];
label.backgroundColor = [UIColor clearColor];
label.textAlignment = UITextAlignmentRight;
label.minimumFontSize = 12.0f;
tableView.separatorColor = [UIColor colorWithHex:0xDAE1E6];
cell.textLabel.backgroundColor = [UIColor clearColor];
cell.textLabel.textColor = [UIColor colorWithHex:0x393B40];
cell.textLabel.font = [UIFont boldSystemFontOfSize:16.0f];
cell.detailTextLabel.backgroundColor = [UIColor clearColor];
cell.detailTextLabel.textColor = [UIColor colorWithHex:0x393B40];
cell.detailTextLabel.font = [UIFont systemFontOfSize:12.0f];
}
cell.textLabel.text = [[objects objectAtIndex:indexPath.row] name];
cell.detailTextLabel.text = [[objects objectAtIndex:indexPath.row] location];
STMultipleDate *dates = [STMultipleDate new];
for (Schedule *sch in [[objects objectAtIndex:indexPath.row] schedule]) {
STDate *date = [STDate new];
[date setWeekday:[[sch day] integerValue]];
[date setHour:[[sch hour] integerValue]];
[date setMinutes:[[sch minutes] integerValue]];
[dates addDate:date];
}
label.text = [STCore splitDates:dates];
cell.accessoryView = label;
return cell;
}
- (NSString *)tableView:(UITableView *)tableView titleForFooterInSection:(NSInteger)section
{
if ([objects count] < 1) {
return NSLocalizedString(#"SETSCH_FOOTER_DEFAULT_404", #"");
}
return nil;
}
STCore.m
- (NSArray *)getAllClassesUsingSortDescriptions:(NSArray *)descs
{
if (![self isReady]) {
return #[];
}
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:#"Classes" inManagedObjectContext:_context];
[fetchRequest setEntity:entity];
[fetchRequest setSortDescriptors:descs];
NSError *error;
NSArray *returned = [_context executeFetchRequest:fetchRequest error:&error];
if (error) {
[_delegate core:self didRecivedAnError:error];
}
return returned;
}

Answer 1

In your viewDidLoad you're locking the context with [[core context] lock];, which is causing your getAllClassesUsingSortDescriptions to wait for the lock to clear. Remove the lock.