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PO-[PickerViewController superview]: unrecognized selector sent to instance & TableView ->ViewController w/ Picker View
 

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  1. PO-[PickerViewController superview]: unrecognized selector sent to instance & TableView ->ViewController w/ Picker View
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    <p>I am a novice ios programmer having some trouble push segueing from a custom UITableViewController scene to a custom UIViewController scene which contains a Picker View and implements the @required pickerview delegate/datasource methods.</p> <p>[I had a screenshot here to offer more insight but I dont have the rep to post images. Imagine a tableview controller with three static rows, each offering a detail disclosure to push to the respective picker view - <a href="http://imgur.com/0oIo0Zr" rel="nofollow">Image</a>]</p> <p>The issue happens at runtime when I tap on any of the table's disclosure indicators. The error returned is </p> <pre><code>Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[PickerViewController superview]: unrecognized selector sent to instance." </code></pre> <p>As mentioned, LocationFilter subclasses UITableViewController and consists of just a few properties for the labels and the stepper.</p> <p>The code for my picker view controller is as follows:</p> <pre><code>#import &lt;UIKit/UIKit.h&gt; @interface PickerViewController : UIViewController &lt;UIPickerViewDataSource,UIPickerViewDelegate&gt; { NSArray *sectionCandidates; NSArray *bankCandidates; NSArray *positionCandidates; } @property (weak, nonatomic) IBOutlet UIPickerView *sectionPicker; @property (weak, nonatomic) IBOutlet UIPickerView *bankPicker; @property (weak, nonatomic) IBOutlet UIPickerView *positionPicker; @property NSArray *sectionCandidates, *bankCandidates, *positionCandidates; @end </code></pre> <p>and the .m:</p> <pre><code>#import "PickerViewController.h" #import "SlotMachine.h" @implementation PickerViewController @synthesize sectionCandidates, sectionPicker, bankCandidates, bankPicker, positionCandidates, positionPicker; - (void)viewDidLoad { [super viewDidLoad]; sectionCandidates = [NSArray arrayWithObjects:@"A", @"B", @"C", @"D", @"E", @"F", @"G", @"H", @"I", nil]; bankCandidates = [NSArray arrayWithObjects:@"0", @"1", @"2", @"3", @"4", @"5", @"6", @"7", @"8", nil]; positionCandidates = [NSArray arrayWithObjects:@"0", @"1", @"2", @"3", @"4", @"5", @"6", nil]; } // returns the number of 'columns' to display. - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView { return 1; } - (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component { //Handle Selection } // returns the # of rows in each component.. - (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component { switch ([pickerView tag]) { case 0: return [sectionCandidates count]; case 1: return [bankCandidates count]; case 2: return [positionCandidates count]; default: return 0; } } // returns the label for each row -(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component { switch ([pickerView tag]) { case 0: return [sectionCandidates objectAtIndex:row]; case 1: return [bankCandidates objectAtIndex:row]; case 2: return [positionCandidates objectAtIndex:row]; default: return @"Null"; } } @end </code></pre> <p>Unfortunately picker views don't seem to get much detailed attention in terms of troubleshooting so I have not been able to find much on SO or in some iOS books that I've been going through to help me resolve this problem. I have a general idea of the possible causes for 'unrecognized selector sent to instance' but am not sure how the fixes for that apply here. I appreciate in advance any help I might receive and also apologize if I did not format properly or give enough/relevant information as this is my first post!</p>
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    1. COThe properties inside your PickerViewController, e.g. sectionPicker, bankPicker, and positionPicker, are also of type PickerViewController? Should they be of type UIPickerView?
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    2. COah, indeed. Although changing the types did not fix the problem posted about, thank you very much for pointing that out! I have edited the question accordingly.
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    3. COAnd are you sure you have set the tags correctly for each picker view? There are issues with tag 0: http://stackoverflow.com/questions/1540012/uiview-viewwithtag-0-problem. Try to set exception breakpoint to see on which line the app crashes.
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