Custom uitablecellview internal inconsistency exception - ios

Question

So I'm getting this error -
*** Assertion failure in void _UIPerformResizeOfTextViewForTextContainer(NSLayoutManager *, UIView<NSTextContainerView> *, NSTextContainer *, NSUInteger)(), /SourceCache/UIFoundation_Sim/UIFoundation-258.1/UIFoundation/TextSystem/NSLayoutManager_Private.m:1510
2014-01-13 18:58:55.829 ReviewApp[1678:3c03] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Only run on the main thread!'
*** First throw call stack:
The error is apparent..but I'm not sure why it's happening. This is how I'm registering the nib -
UINib* dqNib = [UINib nibWithNibName:#"DQCardView" bundle:nil];
UINib* simpleListNib = [UINib nibWithNibName:#"SimpleListCell" bundle:nil];
UINib* photoPostNib = [UINib nibWithNibName:#"PhotoPostCell" bundle:nil];
[self.listView registerNib:dqNib forCellReuseIdentifier:DQCellIdentifier];
[self.listView registerNib:simpleListNib forCellReuseIdentifier:SimpleListCellIdentifier];
[self.listView registerNib: photoPostNib forCellReuseIdentifier:ListPhotoPostIdentifier];
in my cellForRowAtIndexPath, I'm doing this(my code is fairly long so I've summarize) -
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
DQCell* dqCell;
SimpleListCell* listCell;
PhotoPostCell* photoCell;
if(condition1){
listCell = [self.listView dequeueReusableCellWithIdentifier:SimpleListCellIdentifier];
//do other stuff
return listCell;
} else {
dQcell = [self.listView dequeueReusableCellWithIdentifier: DQCellIdentifier];
//do other stuff
return dQcell;
}
}
The listCell line gives me the exception..but the Dqcell line does not.
Further, in the listCell implementation I don't seem to be resizing the textView anywhere.
So what's going on? What should I be checking?

Answer 1

Based on the error you are getting "'NSInternalInconsistencyException', reason: 'Only run on the main thread!'", I would guess that somewhere in your code regarding a UITextView resize, you're doing something from a background thread?
Any time I'm ever doing something on a background thread, such as sending an HTTP request to a server asynchronously, and I want to display something whilst inside this background thread, such as pop up with an alertView with an error, I wrap that code in the following:
dispatch_sync(dispatch_get_main_queue(), ^{
});
This basically tells the OS to do whatever is in that block on the main thread. In the case where I pop up with an alert view while on a background thread, and when I've forgotten to do the above, the app basically locks for some period of time, seemingly broken, and randomly at a later time typically 6 or 7 seconds later, the alert pops up on screen and the app is usable again. Simple rule of thumb: don't do ANYTHING UI related on a background thread.
In your case, without looking at the entire project I wouldn't know exactly what is causing the issue. Hopefully I've given you enough information to help!