UIPickerView in a popover inside a Form Sheet viewController (iPad) - ios

Question

I have a textfield in my form sheet. When the textfield is typed on, I want a popover to appear with a pickerView inside. I've used popOverController before, but in this case I don't have a clue on how to place a pickerView and set it's delegate and datasource to the form sheet view controller, because actually the popover needs an independent view controller.
i tried the following (the app is universal), the popover isn't appearing:
- (IBAction)gradeTextfieldPressed:(UITextField *)sender
{
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad) {
[self.nameTextField resignFirstResponder];
UIViewController *pickerController = [[UIViewController alloc] init];
UIPickerView *pickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(self.gradeTextField.center.x, self.gradeTextField.center.y, 320, 320)];
pickerView.delegate = self;
pickerView.dataSource = self;
[pickerController.view addSubview:pickerView];
UIPopoverController *pickerPopover = [[UIPopoverController alloc] initWithContentViewController:pickerController];
[pickerPopover presentPopoverFromRect:CGRectMake(self.gradeTextField.center.x, self.gradeTextField.center.y, 320, 320) inView:self.view permittedArrowDirections:UIPopoverArrowDirectionUp animated:YES];
[self.gradeTextField setInputView:pickerView];
if ([self.gradeTextField.text isEqualToString:#""]) {
[self pickerView:pickerView didSelectRow:0 inComponent:0];
}
} else if([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone){
[self.picker setHidden:NO];
//[self pickerView:self.picker didSelectRow:0 inComponent:0];
if ([self.gradeTextField.text isEqualToString:#""]) {
[self pickerView:self.picker didSelectRow:0 inComponent:0];
}
[self.gradeTextField setInputView:self.picker];
[self.nameTextField resignFirstResponder];
[self.creditstextField resignFirstResponder];
[self.chaptersTextField resignFirstResponder];
}
}

Answer 1

One way to do this that I found simple Create a new controller with just the PickerView in it (in this case done with a .xib), and have a simple delegate protocol to let your form sheet controller know when something has been picked.
#protocol MyPickerDelegate <NSObject>
- (void)valuePicked:(NSString*)value
#end
#interface MyPickerController : UIViewController <UIPickerViewDelegate, UIPickerViewDataSource>
{
__weak IBOutlet UIPickerView *_pickerView;
}
#property (nonatomic, weak) id<MyPickerDelegate> delegate;
You can then implement the data source and delegate methods in this controller. Here would be the code for when the item was picked:
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
[_delegate valuePicked:[_myStrings objectAtIndex:row]];
}
And finally, in the calling class (your form sheet controller):
- (void)displayPickerFromRect:(CGRect)rect inView:(UIView*)view
{
if (!_pickerController)
_pickerController = [[MyPickerController alloc] initWithNibName:nil bundle:nil];
if (_pickerController)
{
_speedPickerController.delegate = self;
if (!_pickerPopover)
{
_pickerPopover = [[UIPopoverController alloc] initWithContentViewController:_pickerController];
_pickerPopover.popoverContentSize = _pickerController.view.frame.size;
_pickerPopover.delegate = self;
}
[_pickerPopover presentPopoverFromRect:rect inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
}
}
- (void)popoverControllerDidDismissPopover:(UIPopoverController *)popoverController
{
if (_pickerController)
{
_pickerController = nil;
_pickerPopover = nil;
}
}
- (void)valuePicked:(NSString*)value
{
// do something with the picked value
// dismiss the popover if you want it to go away as soon as a value is picked
}