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POWhat does the "Couldn't compile connection:" error mean?
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  1. POWhat does the "Couldn't compile connection:" error mean?
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    copied!<p>I'm getting the following error from Xcode:</p> <pre><code>Couldn't compile connection: &lt;IBCocoaTouchOutletConnection:0x401538380 &lt;IBProxyObject: 0x40154a260&gt; =&gt; categoryPicker =&gt; &lt;IBUIPickerView: 0x4016de1e0&gt;&gt; </code></pre> <p>I've narrowed this down to a single outlet connection in storyboard. My code (about 30 views with lots of other connections) compiles and runs fine until I add a connection from a UIPicker to the view's categoryPicker property. The picker itself also works fine, I just can't reload it without getting this connection to work:</p> <pre><code>@interface FiltersTableViewController : UITableViewController &lt;UIPickerViewDataSource, UIPickerViewDelegate&gt; { NSFetchedResultsController *fetchedResultsController; FilterTableViewController *filterView; AppDelegate *appDelegate; NSManagedObjectContext *managedObjectContext; } @property (nonatomic, strong) FilterTableViewController *filterView; @property (nonatomic, strong) NSFetchedResultsController *fetchedResultsController; @property (nonatomic, strong) NSManagedObjectContext *managedObjectContext; @property (nonatomic, weak) IBOutlet UIPickerView *categoryPicker; - (void)configureCell:(FilterTableViewCell *)cell atIndexPath:(NSIndexPath *)indexPath; - (void)performFetch; @end </code></pre> <p>The UIPickerView is in a UITableViewCell. Here's an image of the storyboard, the connection from "categoryPicker" to "FiltersTableViewController" causes the error: <img src="https://i.stack.imgur.com/DG4bV.png" alt="enter image description here"></p> <p>Thanks for any ideas, or suggestions on how to debug it!</p> <p>EDIT: I removed the connection and added one line to numberOfComponentsInPickerView:</p> <pre><code>- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView { categoryPicker = pickerView; return 1; </code></pre> <p>}</p> <p>This now works!, but I'd like to understand why the connection won't work and what that error message means. Right now this seems like a kludge to me since I use IB connections everywhere else to get object references.</p> <p>EDIT 2: Connecting a prototype cell generates this error: Illegal Configuration: Connection "Cell" cannot have a prototype object as its destination. Not sure if this is new in Xcode 4.5.</p>
 

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