How to Navigate one view to other view - iphone

Question

I used button action to to pop sub view sing below code;
- (IBAction)pickerUpBtn:(id)sender {
PickerPopUpController *screen = [[PickerPopUpController alloc]initWithNibName:#"PickerPopUpController" bundle:Nil];
[self.view addSubview:screen.view];
[self presentModalViewController:screen animated:YES];
}
after i need to go previous window; So i used another button action for it and add bellow code inside action
PickerViewController *screen = [[PickerViewController alloc]initWithNibName:#"PickerViewController" bundle:[NSBundle mainBundle]];
[self.navigationController pushViewController:screen animated:YES];
But It does not navigate to previous view . How could i do it ??

Answer 1

to go back,
do
[self dismissModalViewControllerAnimated:YES]

Answer 2

You need to put only that single code in the Button action..No need of making object of parentViewController.
ie,
-(IBAction)btnaction:(id)sender{
[self dismissModalViewControllerAnimated:YES];
}

Answer 3

You need to add cancel and done for your ViewController which is present modely to come back to parent view Controller.
After implementing the Cancel button, you have to dismiss your viewcontroller in the action function of Cancel button using the dismissModalViewControllerAnimated function
[self dismissModalViewControllerAnimated:YES];

Answer 4

For push view controller, you can do like below,
PickerViewController *screen = [[PickerViewController alloc]initWithNibName:#"PickerViewController" bundle:[NSBundle mainBundle]];
[self.navigationController pushViewController:screen animated:YES];
Then for go back, you have to add one button in "Screen" view controller and it's click event you have to write below code,
[self.navigationController popViewControllerAnimated:YES];
Hope, it would be helpful.
Let me know in case of any difficulty.
If you are using the method "presentmodelviewcontroller" then you have to write below line in button click.
[self dismissModalViewControllerAnimated:YES];