Segue crashing - debugger doesn't display any useful error
ios, iphone, objective-c, xcode
Solution
Copied from comments, as an answer once the actual exception was revealed:
Most likely the TweetDetailViewController in your storyboard has some connection that links to an outlet called "toolbar" but the code for that class doesn't have a property with that name. That's the usual reason at least for that kind of error when a view controller is involved.
Problem
UPDATE: Ok, I managed to log the exception: ``` [<TweetDetailViewController 0x685f9f0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key toolbar. ``` I have a toolbar in the target controller view. Could that be causing the problem? I have no idea what the heck is going on. I have not changed segues at all and they worked perfectly few minutes ago. I was changing some unrelated things in a detail view controller and now the app crashes during segue from the root to the view controller. I am trying to debug this. Here is where the code crashes: Step over: Step over: Step over: Ok, here is the setter method which is being called in prepareForSegue: ``` - (void)setTweet:(Tweet *)newTweet { if (_tweet != newTweet) { _tweet = newTweet; } } ``` I call a configuration method when entering the detail controller: ``` - (void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; [self configureView]; } - (void)configureView { // Update the user interface for the tweet detail page if (_tweet) { self.tweetUserName.text = _tweet.userName; self.tweetCreatedAt.text = _tweet.createdAt; self.tweetText.contentInset = UIEdgeInsetsMake(-4,-8,0,0); self.tweetText.text = _tweet.text; if (_tweet.retweeted == YES) { [self.retweetButton setTintColor:[UIColor grayColor]]; [self.retweetButton setEnabled:NO]; } if (!_tweet.userProfileImage) { dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ NSString *imageUrl = _tweet.userProfileImageUrl; NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:imageUrl]]; dispatch_async(dispatch_get_main_queue(), ^{ self.tweetUserProfileImage.image = [UIImage imageWithData:data]; }); }); } else { self.tweetUserProfileImage.image = _tweet.userProfileImage; } } } ```