UIActivityIndicatorView showing and causing crash on two specific views - ios

Question

I am getting a very hard to trace crash in one of my views that is related to UIActivityIndicatorViewSometimes it crashes right away, sometimes it takes a few loads (going back to the previous view in the navigation stack and loading the view again). I have run the app through instruments, and while memory use keeps rising, I don't see any leaks. Could I be running out of memory? I also don't see any memory warnings. Here is the error:
*** -[UIActivityIndicatorView release]: message sent to deallocated instance 0x15f6d6aa0
I am not making any connections, and I can see the ActivityIndicator show up and then the app crashes when it disappears (or it disappears before the app crashes).
I have read that AFNetworking can cause this problem, but I am not using it. I am just using NSURLSession.
Both classes are very similar, and I have included the loading calls of one, as the class is too big to post here.
It is displayed in a Navigation Controller nested in a TabBarController:
- (BOOL)prefersStatusBarHidden {
return NO;
}
- (void)viewDidLoad
{
[super viewDidLoad];
self.userDefaults = [NSUserDefaults standardUserDefaults];
self.hairlineHeightConstraint.constant = 0.5f;
self.hairlineDivider.backgroundColor = [UIColor colorWithWhite:0.9f alpha:1.0f];
self.title = #"Course";
[self.classroomButton setTintColor:[UIColor pxColorWithHexValue:self.passedCourse.courseColor]];
[self.classroomButton addTarget:self action:#selector(subscribeToCourse:) forControlEvents:UIControlEventTouchUpInside];
[self getAnySubscribedCourse];
if (self.subscribedCourse) {
if (self.passedCourse == self.subscribedCourse) {
[self.classroomButton setTitle:#"Remove from Classroom" forState:UIControlStateNormal];
self.subscribedToThisCourse = YES;
} else {
self.alreadySubscribed = YES;
}
}
[self configureHeaderView];
NSError *error;
if (![[self fetchedResultsController] performFetch:&error]) {
NSLog(#"Unresolved error %#, %#", error, [error userInfo]);
}
}
- (void)viewDidLayoutSubviews
{
[super viewDidLayoutSubviews];
if (self.shareView) {
CGRect frame = self.shareView.frame;
CGFloat navbarHeight = self.navigationController.navigationBar.frame.size.height;
CGFloat statusBarHeight = [[UIApplication sharedApplication] statusBarFrame].size.height;
frame = CGRectMake(0.0f, self.tableView.contentOffset.y + statusBarHeight + navbarHeight, frame.size.width, frame.size.height);
self.shareView.frame = frame;
[self.view bringSubviewToFront:self.shareView];
}
NSString *backText = self.navigationItem.backBarButtonItem.title;
UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:backText style:UIBarButtonItemStylePlain target:nil action:nil];
[backButton setTitleTextAttributes:[[MSThemeManager currentTheme] barButtonTextDictionaryForState:UIControlStateNormal withTintColor:[UIColor pxColorWithHexValue:self.passedCourse.courseColor]] forState:UIControlStateNormal];
self.navigationItem.backBarButtonItem = backButton;
}
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
self.navigationController.navigationBarHidden = NO;
[self.tableView deselectRowAtIndexPath:[self.tableView indexPathForSelectedRow] animated:animated];
[self.tableView reloadData];
}
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
if ([self.tableView.tableHeaderView isKindOfClass:[ParallaxCourseDetailHeaderView class]]) {
ParallaxCourseDetailHeaderView *headerView = (ParallaxCourseDetailHeaderView *)self.tableView.tableHeaderView;
[headerView.courseInfoAudioPlayer stop];
self.tableView.tableHeaderView = nil;
}
[[NSNotificationCenter defaultCenter] removeObserver:self];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
#pragma mark - HeaderView
- (void)configureHeaderView
{
CGRect screenBound = [[UIScreen mainScreen] bounds];
CGSize screenSize = screenBound.size;
CGFloat screenWidth = screenSize.width;
NSDictionary *attributesDictionary = #{NSFontAttributeName : self.headerLabel.font};
CGFloat width = screenWidth - self.headerLabel.frame.origin.x - 15.0f;
CGSize boundingBox = CGSizeMake(width, CGFLOAT_MAX);
NSString *descriptionToBound = self.passedCourse.courseDescription;
CGRect labelRect = [descriptionToBound boundingRectWithSize:boundingBox
options:NSStringDrawingUsesLineFragmentOrigin
attributes:attributesDictionary
context:nil];
CGRect headerLabelRect = self.headerLabel.frame;
CGRect tableHeaderViewRect = self.tableView.tableHeaderView.frame;
CGRect dividerRect = self.hairlineDivider.frame;
CGFloat heightDifference = ceilf(labelRect.size.height - headerLabelRect.size.height);
tableHeaderViewRect.size.height += heightDifference;
self.tableView.tableHeaderView.frame = tableHeaderViewRect;
dividerRect.origin.y += heightDifference;
headerLabelRect.size.width = ceil(labelRect.size.width);
headerLabelRect.size.height = ceil(labelRect.size.height);
headerLabelRect.origin.y = (dividerRect.origin.y - headerLabelRect.size.height) / 2;
self.headerLabel.frame = headerLabelRect;
CGFloat parallaxViewHeight = 280.0f;
CGFloat headerHeight = parallaxViewHeight + heightDifference;
ParallaxCourseDetailHeaderView *headerView = [[ParallaxCourseDetailHeaderView alloc] initWithTitleViewStyle:SWParallaxTitleViewStyleWhiteWithMask withHeight:tableHeaderViewRect.size.height headerHeight:headerHeight];
UIImage *image = [UIImage imageNaobj:self.passedCourse.headerImage];
headerView.courseImage = [image imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
[headerView setTintColor:[UIColor whiteColor]];
headerView.isTitleViewOpaque = YES;
headerView.fadeInDuration = 0.0;
headerView.trackID = self.passedCourse.aboutTrackID;
[headerView courseAudioIntroControl];
UIImage *headerTeacherImage = [UIImage imageNaobj:[NSString stringWithFormat:#"%#", self.passedCourse.teacher.teacherImageID]];
self.headerTeacherImage.image = headerTeacherImage;
self.headerTeacherImage.layer.cornerRadius = self.headerTeacherImage.frame.size.height / 2;
self.headerTeacherImage.clipsToBounds = YES;
self.headerLabel.text = self.passedCourse.courseDescription;
[self.headerTeacherButton setImage:headerTeacherImage forState:UIControlStateNormal];
UIView *oldHeaderView = self.tableView.tableHeaderView;
oldHeaderView.frame = CGRectMake(0, 0, screenWidth, oldHeaderView.frame.size.height);
self.tableView.tableHeaderView = nil;
[headerView.titleView addSubview:oldHeaderView];
self.tableView.tableHeaderView = headerView;
[headerView.imageContainerView setBackgroundColor:[UIColor pxColorWithHexValue:self.passedCourse.courseColor]];
headerView.title = self.passedCourse.title;
headerView.subtitle = [NSString stringWithFormat:#"%lu Sessions", (unsigned long)self.passedCourse.courseObjects.count];
headerView.teacher = [NSString stringWithFormat:#"With %#", self.passedCourse.teacher.teacherName];
[headerView.titleLabel adjustCurrentFontSize];
[headerView.subtitleLabel adjustCurrentFontSize];
[headerView.teacherLabel adjustCurrentFontSize];
}
#pragma mark - ScrollView
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
if ([self.tableView.tableHeaderView isKindOfClass:[ParallaxCourseDetailHeaderView class]]) {
ParallaxCourseDetailHeaderView *headerView = (ParallaxCourseDetailHeaderView *)self.tableView.tableHeaderView;
headerView.parallaxOffset = scrollView.contentOffset.y + scrollView.contentInset.top;
}
}