UIPickerView will not display - ios

Question

I am trying to create a PickerView view programatically.
I have followed all of the necessary steps however the picker just simply appears and then disappears straight away. No data can be seen.
I am setting the delegate and data source and I have implemented the necessary methods.
Here is my code:
in .h
#interface NJATimeEntryViewController : UIViewController <UIPickerViewDelegate, UIPickerViewDataSource>
#property (nonatomic, strong) UIPickerView *customerPicker;
#property (nonatomic, strong) NSArray *pickerTitles;
#end
in .m
- (void)viewDidLoad
{
[super viewDidLoad];
self.pickerTitles = #[#"ONE", #"TWO", #"THREE"];
self.customerPicker = [[UIPickerView alloc] initWithFrame:CGRectMake(0, 200, 320, 200)];
self.customerPicker.dataSource = self;
self.customerPicker.delegate = self;
[self.view addSubview:self.customerPicker];
}
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
return 1;
}
-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
return self.pickerTitles.count;
}
-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
return [[self pickerTitles] objectAtIndex:row];
}
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
NSLog(#"Selected Row %d", row);
}
All help is appreciated thanks.
FIXED:
All i did was set the background color of the view controllers view and now it works. I see this as a bug as no where is it stated that the background color has to be set.

Answer 1

Set Some Background color ( except black )of your view, then try,
self.view.backgroundColor=[UIColor yellowColor];