Allowing user to select a UIPickerView row by tapping.

Question

Hi.

I'm trying to use a UIPicker View with a behavior somehow different of what's usually seen in iPhone code examples.

What I want to do is to allow users to scroll through the picker contents, but not to select a picker's row automatically (using the "didSelectRow" method from picker's delegate). Instead, I want to allow the user to touch the center row of the picker, which gets highlighted, and becomes the selection.

Is there any way to achieve this?

Thanks in advance.

Answer 1

There are only 2 delegates for UIPickerView.

• UIPickerViewDelegate
• UIPickerViewDataSource

So, we can use only 7 methods to control UIPickerView by delegate.

– pickerView:rowHeightForComponent:
– pickerView:widthForComponent:
– pickerView:titleForRow:forComponent:
– pickerView:viewForRow:forComponent:reusingView:
– pickerView:didSelectRow:inComponent:
– numberOfComponentsInPickerView:
– pickerView:numberOfRowsInComponent:

that'all.

In UITableViewDelegate case, there are more methods for UITableView for managing selections. such as, – tableView:willSelectRowAtIndexPath:
– tableView:didSelectRowAtIndexPath:
– tableView:willDeselectRowAtIndexPath:
– tableView:didDeselectRowAtIndexPath:

However...

In UIPickerViewDelegate case, there is only 1 method for responding to row selection.

– pickerView:didSelectRow:inComponent:

Answer 2

1. make a new UIControl

   • same position as the UIPickerView
   • [yourcontrol setBackGroundColor: [UIColor clearColor]];

2. make a method

- (IBAction) pickerControlTapped 
{
    [yourpicker selectRow: rand()% yourpickersize
              inComponent: 0
                 animated: YES];
}

.3. make a connection between 1 and 2

 
[yourcontrol addTarget: self 
                action: @selector(pickerControlTapped) 
      forControlEvents: UIControlEventTouchUpInsied];