Terminating app due to uncaught exception 'NSInternalInconsistencyException? any clue? - ios

Question

here's my code that I am using now but still getting all kinds of errors:
No visible #interface for 'HomeViewController' declares the selector 'getCount'
And
/Volumes/Lex/HomeViewController.h:12:12: Required for direct or indirect protocol 'UIPickerViewDataSource'
/Volumes/Lexar/HomeViewController.m:15:17: Incomplete implementation
My code (.m file)
- (void)viewDidLoad
{
[super viewDidLoad];
PFUser *currentUser = [PFUser currentUser];
if (currentUser) {
NSLog(#"Current user: %#" , currentUser.username);
}
else {
[self performSegueWithIdentifier:#"showLogin" sender:self];
self.pickerView.dataSource = self;
self.pickerView.delegate = self;
}
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent: (NSInteger)component
{
if ([self getCount] == 0)
return 1;
return [self getCount];
}
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent: (NSInteger)component reusingView:(UIView *)view {
if ([self getCount] == 0)
return nil;
}
- (IBAction)logout:(id)sender {
[PFUser logOut];
[self performSegueWithIdentifier:#"showLogin" sender:self];
}
#end
And the header
/// .h controller
#import <UIKit/UIKit.h>
#import <Parse/Parse.h>
#interface HomeViewController : UIViewController <UIPickerViewDataSource, UIPickerViewDelegate>
#property (strong, nonatomic) IBOutlet UIPickerView *pickerView;
- (IBAction)logout:(id)sender;
#end

Answer 1

As you mentioned in your comment, you are just placing UIPickerView...but for using picker view you need to set Datasource like UITableView and have to implement all #required methods.
In picker view's data source protocol, there are 2 #required methods
// returns the number of 'columns' to display.
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView;
// returns the # of rows in each component..
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component;
So you need to implement above two method in your controller (say MainViewController). and don't forget to set this class as delegate and datasource to UIPicker view as below
in ViewDidLoad of MainViewController
self.yourPickerView.datasource = self;
self.yourPickerView.delegate = self;