The action of UIBarbuttonItem on UIToolBar not called - ios

Question

I am having trouble as the action of UIBarbuttonItem on UIToolBar is not be called.
In the following code, although the doneBtn on toolBar is tapped, the action doneBtnAction: is not be called.
Do you have any idea to fix it?
- (void)viewDidLoad {
UIPickerView *pickerView = [[UIPickerView alloc] init];
UIToolbar *toolBar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, -44, 320, 44)];
UIBarButtonItem *doneBtn = [[UIBarButtonItem alloc] initWithTitle:#"Done" style:UIBarButtonItemStyleDone target:self action:#selector(doneBtnAction:)];
UIBarButtonItem *flex = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
toolBar.items = #[flex, doneBtn];
[pickerView addSubview:toolBar];
UITextField *textField = [[UITextField alloc] init];
textField.inputView = pickerView;
}
- (void)doneBtnAction:(UIBarButtonItem *)sender {
NSLog(#"%#", sender);
}

Answer 1

Don't add the toolbar as a subview of the picker view, especially with a negative y origin (No touches reach the toolbar because the taps are clipped to the picker view's frame).
Instead, make the toolbar the inputAccessoryView of the text field.
textField.inputAccessoryView = toolBar;
Complete code:
- (void)viewDidLoad {
UIPickerView *pickerView = [[UIPickerView alloc] init];
UIToolbar *toolBar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];
UIBarButtonItem *doneBtn = [[UIBarButtonItem alloc] initWithTitle:#"Done" style:UIBarButtonItemStyleDone target:self action:#selector(doneBtnAction:)];
UIBarButtonItem *flex = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
toolBar.items = #[flex, doneBtn];
UITextField *textField = [[UITextField alloc] init];
textField.inputView = pickerView;
textField.inputAccessoryView = toolBar;
}
One other note - Why not use the standard system Done type for the bar button item?