UIDatePicker Moving up tableview content - ios

Question

I have a UIViewController with a Navigation bar and also a UITableView in it. I have button in the view controller that when it is pressed pops up a UIDatePicker. However, When i press the button to pop up the UIDatePicker, all my content in the tableview moves up about 30 pixels. Not cool. I want the UIDatePicker to just popup overtop the view controller without shifting any elements. Here is the code of my date picker. Thoughts?
- (IBAction)timeWasPressed:(id)sender {
if(self.pickerShown == NO){
self.slidePicker = [[UIDatePicker alloc] init];
self.slidePicker.datePickerMode = UIDatePickerModeTime;
self.slidePicker.backgroundColor = [UIColor whiteColor];
[self.navigationController setNavigationBarHidden:YES];
[self.view addSubview:self.slidePicker];
//make done button
self.toolBar= [[UIToolbar alloc] initWithFrame:CGRectMake(0,0,320,64)];
self.toolBar.barTintColor = [UIColor whiteColor];
UIBarButtonItem *barButtonDone = [[UIBarButtonItem alloc] initWithTitle:#"Done"
style:UIBarButtonItemStylePlain target:self
action:#selector(doneButton)];
self.toolBar.items = [[NSArray alloc] initWithObjects:barButtonDone,nil];
barButtonDone.tintColor=[UIColor blackColor];
self.pickerShown = YES;
[self.view addSubview:self.toolBar];
}
}
-(void)doneButton{
NSDate *pickerDate = [self.slidePicker date];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateStyle:NSDateFormatterNoStyle];
[dateFormatter setTimeStyle:NSDateFormatterShortStyle];
NSString *selectionString = [[NSString alloc] initWithFormat:#"%#", [dateFormatter stringFromDate:pickerDate]]; //
[self.timeButton setTitle:selectionString forState:UIControlStateNormal];
self.pickerShown = NO;
[self.slidePicker removeFromSuperview];
[self.toolBar removeFromSuperview];
[self.navigationController setNavigationBarHidden:NO];
}

Answer 1

What jason said is right, but he forgot to say you'll have to erase the line
[self.navigationController setNavigationBarHidden:YES];
And so, you'll have to replace
//....
[self.view addSubview:self.slidePicker];
//...
[self.view addSubview:self.toolBar];
//...
with
//...
[self.navigationController.view addSubview:self.slidePicker];
//...
[self.navigationController.view addSubview:self.toolBar];
//...
So your "timeWasPressed:" code will be:
self.slidePicker = [[UIDatePicker alloc] init];
self.slidePicker.datePickerMode = UIDatePickerModeTime;
self.slidePicker.backgroundColor = [UIColor whiteColor];
//[self.navigationController setNavigationBarHidden:YES];
[self.navigationController.view addSubview:self.slidePicker];
//make done button
self.toolBar= [[UIToolbar alloc] initWithFrame:CGRectMake(0,0,320,64)];
self.toolBar.barTintColor = [UIColor whiteColor];
UIBarButtonItem *barButtonDone = [[UIBarButtonItem alloc] initWithTitle:#"Done"
style:UIBarButtonItemStylePlain target:self
action:#selector(doneButton)];
self.toolBar.items = [[NSArray alloc] initWithObjects:barButtonDone,nil];
barButtonDone.tintColor=[UIColor blackColor];
self.pickerShown = YES;
[self.navigationController.view addSubview:self.toolBar];
Don't forget you can also remove the
[self.navigationController setNavigationBarHidden:NO];
from your doneButton method.
Hope that helps.

Answer 2

I think the reason why everything shifts up is because you are hiding the navigation bar.
[self.navigationController setNavigationBarHidden:YES];
Replace that line with the following and if you see everything animating up then this is the reason why everything is shifting.
[self.navigationController setNavigationBarHidden:true animated:true];
If you want the date picker to show over the navigation controller then instead of adding it to the view controller's view, add the picker to the navigation controller's view instead.
So.. replace
[self.view addSubview:self.slidePicker];
with..
[self.navigationController.view addSubview:self.slidePicker];
Hope it works out.