在其他View Controller的标签上显示UIPicker选择

Question

Working on an App for Ipad which has one main view controller and 3 popover views, each popover view has a UIPicker, I want to display in 3 different labels located in the main view controller the UIPickers selection, each label is asociated to its own UIPicker. I had been trying with delegate objects to pass the data from the pickers to the labels but something is wrong. Any clue PLEASE! Thanks.

Answer 1

The easiest way is to use tags.

typedef enum { 
  FirstPicker = 1,
  SecondPicker,
  ThirdPicker 
} PickerTags; 

When you create the picker, indicate which one it is by setting the tag either in storyboard or like this

picker.tag = FirstPicker; 

In your picker callbacks it is now easy to identify the picker:

- (void)pickerView:(UIPickerView *)pickerView 
      didSelectRow:(NSInteger)row 
       inComponent:(NSInteger)component {

   if (picker.tag == FirstPicker) { /* handle first picker */ }
   // etc.
}