Data from array is not showing up in the pickerView - iphone

Question

I am trying to do Single-Component Picker example Beginning iOS 6 Development Book, almost every thing works fine but Data from array is not showing up in the pickerView
Please Help
Here is my .h file
<UIPickerViewDataSource , UIPickerViewDelegate>
{
IBOutlet UIPickerView *singlePicker;
NSArray *chaNames;
}
#property (strong, nonatomic) IBOutlet UIPickerView *singlePicker;
#property (strong, nonatomic) NSArray *chaNames;
- (IBAction)buttonPressed:(id)sender;
#end
And here is .m file
#import "SSPSingleComponentViewController.h"
#interface SSPSingleComponentViewController ()
#end
#implementation SSPSingleComponentViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
self.chaNames = #[#"Luke",#"Leia",#"Han",#"Chewbacca",#"Artoo", #"Threepio",#"lando"];
}
- (IBAction)buttonPressed:(id)sender {
NSInteger row = [self.singlePicker selectedRowInComponent:0];
NSString *selected = self.chaNames[row];
NSString *title = [[NSString alloc]initWithFormat:#"You slected %#", selected];
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:#"OutPut is : " message:title delegate:self cancelButtonTitle:#"OK" otherButtonTitles:nil, nil];
[alert show];
}
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
return 1;
}
-(NSInteger)pickerView:(UIPickerView *)pickerView
numberOfRowsInComponent:(NSInteger)component
{
return [self.chaNames count];
}
-(NSString *)pickerView:(UIPickerView *)pickerView
titleForRow:(NSInteger)row
forComponent:(NSInteger)component
{
return[self.chaNames objectAtIndex:row];
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end
Please Help
Thanks in advance :)

Answer 1

You need to alloc your NSArray object as follows:
self.chaNames = [NSArray alloc] initWithObjects:#"Luke",#"Leia",#"Han",#"Chewbacca",#"Artoo", #"Threepio",#"lando"];
Edit:
you also need to set singlePicker.datasource = self; and singlePicker.delegate = self; within viewDidLoad or hook it up correctly with IB (both the delegate and datasource)
-(void)viewDidLoad {
self.chaNames = [NSArray alloc] initWithObjects:#"Luke",#"Leia",#"Han",#"Chewbacca",#"Artoo", #"Threepio",#"lando"];
}