Selecting a row in a UIPickerView dynamically

Question

Hello everyone ^.^,

I have an iPhone app that use UIPickerView and 3 buttons.
This picker has one component with 100 rows (0, 1, 2, ..., 98, 99).

I'd like to implement the code so that, when I press on the buttons

• button1: will make the picker select row 21th (which has value 20)
• button2: will make the picker select row 41th (which has value 40)
• button3: will make the picker select row 60th (which has value 60)

I know how to make the picker select a row when the view first load by put the following code in to viewDidLoad() method:

(void)viewDidLoad
{
........
[picker selectRow:50 inComponent:0 animated:YES];
}
but I could not make the picker select the desired row when I tap the buttons.

Any help would be appreciated!

Thanks for reading ^.^

Answer 1

Hook the button to an action method, then in your action method simply call the same selectRow:inComponent:animated: method, i.e.

- (IBAction)button1Action {
    [picker selectRow:20 inComponent:0 animated:YES];
}

And you hook up the button to that method in Interface Builder.

Answer 2

you can put the same code that you have kept in viewDidLoad for selecting pickerRow on the event that get fires when button is clicked.

-(void)button1clickevent{
//FUNCTION MUST GET FIRE WHEN BUttON ! IS CLICKED
       [picker selectRow:50 inComponent:0 animated:YES];
}

HAPPY iCODING...

Answer 3

OK, now I recreate the project and retype the code:
- (IBAction) goToRowTwenty
{
[picker selectRow:20 inComponent:0 animated:YES];
[timerPickerView reloadComponent:0];
}
and it works, I really don't know what happened,
but thank you guys for answering my question. I appreciate your helps.