PickerView in miss location after rotated

I use code as below to show a PickerView, but is not located at middle of center, then if I rotated, the PickerView is not to rotated, what should I have to implement for tight showing?

Code:

- (void)showPickerView {
    if (pickerView == nil) {
        pickerView = [[UIDatePicker alloc] initWithFrame: CGRectMake(0.0, 0.0, 0.0, 0.0)];
    }
	
    if (self.pickerView.superview == nil) {
        [self.view.window addSubview: self.pickerView];
		
        // size up the picker view to our screen and compute the start/end frame origin 
        // for our slide up animation compute the start frame
        CGRect screenRect = [[UIScreen mainScreen] applicationFrame];
        CGSize pickerSize = [self.pickerView sizeThatFits:CGSizeZero];
        CGRect startRect = CGRectMake(0.0, screenRect.origin.y + screenRect.size.height, pickerSize.width, pickerSize.height);
        self.pickerView.frame = startRect;
		
        // compute the end frame
        CGRect pickerRect = CGRectMake(0.0, screenRect.origin.y + screenRect.size.height - pickerSize.height, pickerSize.width, pickerSize.height);
		
        // start the slide up animation
        [UIView beginAnimations:nil context:NULL];
        [UIView setAnimationDuration:0.3];
		
        // we need to perform some post operations after the animation is complete
        [UIView setAnimationDelegate:self];
		
        self.pickerView.frame = pickerRect;
		
        // shrink the table vertical size to make room for the date picker
        CGRect newFrame = detail.frame;
        newFrame.size.height -= self.pickerView.frame.size.height;
        self.detail.frame = newFrame;
        [UIView commitAnimations];
    }	
}

 

I knew why PickerView is not at the center of screen, because code as below return a mistake size. I run in Portrait mode, but system gives me a Landscape width. Is this a bug in SDK?

Code:

CGSize pickerSize = [pickerView sizeThatFits:CGSizeZero];

 

I used code as below to correct miss width. Only in 4.1.

Code:

CGRect screenRect = [[UIScreen mainScreen] applicationFrame];
CGSize pickerSize = [pickerView sizeThatFits:CGSizeZero];
pickerSize.width = screenRect.size.width;	

By the way, do you have any idea for rotation problem?

 

You have special eyes.

I am using iOS SDK 4.1 and do my job by VNC from a ThinkPad to Mac mini.

Can you tell me where I can find a sample for PickerView in Popover?

 

Really?

 

Your suggestion is no any suggestible all time!

You are not the Demi-God, but the God!

If anyone can do programming just read book, who needs this forum?

 

A little, though not enough. Here is found by me at first...

But I want to use a DatePicker in popover and in programming, it is not a controller so that a UIViewController might be neede.

I want to know if there is simpler way to use a DatePicker in popover, it seems like there is no such story on Internet...

 

Thanks for your suggestion.