How do I reload/refresh the UIPickerView (with new data array) based on button press?

Solution 1:

You will have to implement the datasource and the delegate.

once you press a button, set an array pointer to the appropriate array.

than call [thePicker reloadAllComponents];

-(IBAction) usButtonPressed:(id)sender{
    self.inputArray = self.usArray;
    [self.thePicker reloadAllComponents];
}

-(IBAction) mexicoButtonPressed:(id)sender{
    self.inputArray = self.mexicoArray;
    [self.thePicker reloadAllComponents];
}

the datasource methods:

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    return 1;
}


- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
    return [self.inputArray count];
}

the delegate methods:

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
    return [self.inputArray objectAtIndex:row];
}

Solution 2:

Swift: xcode 6.1

// reload the component of picker (Used this inside the trigger action or button)

[self.pickerControl reloadAllComponents];

Solution 3:

In swift 3,4,or 5 you just write in didSelectRow function like bellow

func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {


        self.view.endEditing(false)
        yourPickerView.selectRow(0, inComponent: 0, animated: true)
        yourPickerView.reloadAllComponents();

}

Solution 4:

By calling

thePicker.delegate = self;

again, I was able to force refresh the pickerview with new info