iOS, UIPickerView create programmatically, empty view, delegates work

@Hey everybody,

I have trouble w/ UIPickerView. I'm planning to create a view controller which should allow user to specify the one of the next day. PickerView should show strings like "wed, 1 Dec", "thu, 2 dec", etc The problem is PickerView is empty (PickerView doesn't show any string). In spite of delegates methods return necessary count of strings and the strings themselves.

Image of empty PickerView - LINK

Below is my code.

.h

@interface OMSDatePickerViewController : UIViewController <UIPickerViewDelegate, UIPickerViewDataSource>

@property (nonatomic        ) NSInteger     amountOfDays;
@property (nonatomic        ) CGFloat       cellHeight;

@end

.m

#import "OMSDatePickerViewController.h"

@interface OMSDatePickerViewController () {
    NSMutableArray * dateForChoose;
    NSInteger datePickerActiveIdx;

    UIPickerView *dPicker;
}

@end

- (void)viewDidLoad
{
    NSLog(@"viewDidLoad");

    [super viewDidLoad];
    // Do any additional setup after loading the view.

    dateForChoose = [[NSMutableArray alloc] init];

    dPicker = [[UIPickerView alloc] initWithFrame:CGRectMake(5, 5, 200, 150)];  

    [self.view setFrame: CGRectMake(xPos, yPos, WIN_WIDTH, WIN_HEIGHT)];
    [self.view setAlpha:1.0];
    [self.view setBackgroundColor:[UIColor grayColor]];
    [[self.view layer] setCornerRadius:5.0f];
    [[self.view layer] setBorderWidth:2.0f];
    [[self.view layer] setMasksToBounds:YES];
    [self.view setContentMode:UIViewContentModeScaleToFill];

    // Creating the list of dates
    NSDateFormatter *df = [[NSDateFormatter alloc] init];
    df.dateFormat = @"EEE',' dd MMM";

    [dateForChoose removeAllObjects];

    // Add some data for demo purposes.
    NSDate *curDate = [NSDate date];
    NSString *str;
    for (NSInteger i = 0; i< amountOfDays; i++, curDate = [curDate dateByAddingTimeInterval:60*60*24]) {
        str = [df stringFromDate:curDate];
        [dateForChoose addObject:str];
    }


    [dPicker setDataSource: self];
    [dPicker setDelegate: self];

    dPicker.showsSelectionIndicator = YES;

    [self.view addSubview:dPicker];


    datePickerActiveIdx = 0;

    NSLog(@"%@", dPicker);
}

and delegates methods

// Number of components.
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{
    return 1;
}

// Total rows in our component.
-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{
    NSLog(@"numberOfRowsInComponent: %d", [dateForChoose count]);
    return [dateForChoose count];
}

// Display each row's data.
-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{
    NSString *str = [dateForChoose objectAtIndex: row];
    NSLog(@"%@", [dateForChoose objectAtIndex: row]);
    return [dateForChoose objectAtIndex: row];
}

// Do something with the selected row.
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{
    NSLog(@"You selected this [%2d, %2d]: %@", row, component, [dateForChoose objectAtIndex: row]);
    NSLog(@"count - %d", [dateForChoose count]);
    datePickerActiveIdx = row;
}

Interesting things when I try to rotate wheel "didSelectRow" is called and always return row == 0 and show:

[55215:c07] You selected this [ 0, 0]: Wed, 04 Dec

[55215:c07] count - 4

Any ideas?

Addition: the same code work well if it's copied to the implementation of internal function of some UIViewController. For example it's button event handler and the code is called by pressing this button.

WHAT IS IT???*

PS: working log

[18241:907] viewDidLoad
[18241:907] <UIPickerView: 0x1cd944a0; frame = (5 5; 190 162); layer = <CALayer: 0x1cd94990>>
[18241:907] viewWillAppear
[18241:907] numberOfRowsInComponent: 4
[18241:907] numberOfRowsInComponent: 4
[18241:907] Wed, 04 Dec
[18241:907] Thu, 05 Dec
[18241:907] Fri, 06 Dec
[18241:907] Sat, 07 Dec
[18241:907] viewDidAppear