Fixed labels in the selection bar of a UIPickerView

Question

In the clocks application, the timer screen shows a picker (probably a UIPicker in UIDatePickerModeCountDownTimer mode) with some text in the selec

Answer 1

There are 2 things you can do:

If each row and component in row is a simple text, than you can simply use the default UIPickerView implementation as is, and in your controller implement the following UIPickerViewDelegate methods :

• - (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component to keep track of which row is selected

• and return a different text for the selected row in your implementation of - (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component

If you need to have something other than text as the differentiator for the selected row, than you basically need to create your own CustomPickerView that derives from the UIPickerView and then

• First implement the - (void)selectRow:(NSInteger)row inComponent:(NSInteger)component animated:(BOOL)animated and keep track of which row is selected.

• Then implement the - (UIView *)viewForRow:(NSInteger)row forComponent:(NSInteger)component to generate a different view for the selected row.

A sample for using the UIPickerView or implementing custom UIPickerView is available in the SDK, called UICatalog.