Resign first responder doesn't work when picker is show - ios

Question

I've a problem with date picker. When I touch on textfield(datumletu) I call picker and datumletu [resign firstresponder]. But no effect.
Here is my code. I'm trying everything but nothing is working.
-(void)textFieldDidBeginEditing:(UITextField *)textField {
CGRect screenRect = [[UIScreen mainScreen] bounds];
CGFloat screenWidth = screenRect.size.width;
CGFloat screenHeight = screenRect.size.height;
if (textField == self.datumLetu) {
[self.view endEditing:YES];
[self.autoTextFieldPriletu resignFirstResponder];
[self.autoTextField resignFirstResponder];
[self.cisloLetu resignFirstResponder];
[self.datumLetu resignFirstResponder];
self.picker.hidden = YES;
[self showPicker];
CGRect rect = self.view.frame;
if(rect.origin.y == 0)
{
rect.origin.y -= 110;
rect.size.height += 110;
[UIView animateWithDuration:0.2 animations:^{
self.view.frame = rect;
}];
self.picker.frame = CGRectMake(0, screenHeight / 2 + screenHeight / 3.2, screenWidth, screenHeight/2);
}
and picker
-(void)showPicker
{
[self showAction];
}
-(void) showAction
{
CGRect screenRect = [[UIScreen mainScreen] bounds];
CGFloat screenWidth = screenRect.size.width;
CGFloat screenHeight = screenRect.size.height;
self.picker = [[Picker alloc] initWithFrame:CGRectMake(0, screenHeight / 2 + screenHeight / 10.5, screenWidth, screenHeight/2)];
[self.picker addTargetForDoneButton:self action:#selector(cancelPressed)];
[self.picker addTargetForCancelButton:self action:#selector(cancelPressed)];
[self.picker setMode:UIDatePickerModeDateAndTime];
[self.picker.picker addTarget:self action:#selector(pickerChanged:) forControlEvents:UIControlEventValueChanged];
[self.view addSubview:self.picker];
self.picker.hidden = NO;
}
Any help is highly appreciated.

Answer 1

In your ViewController add the delegate of the UITextField :
#interface ViewController : UIViewController <UITextFieldDelegate>
While Creating the UITextField or in ViewDidLoad:
self.myTextField.delegate = self;
In your implementation file:
#pragma mark - UITextFieldDelegate
-(void)textFieldDidBeginEditing:(UITextField *)textField
{
[textField resignFirstResponder];
// show your picker here
}
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
return NO;
}