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How to reload, and reset the number of rows in a UIPickerView - Swift


How to reload, and reset the number of rows in a UIPickerView - Swift

By : Duane Laythe
Date : November 17 2020, 11:55 AM
hope this fix your issue You need to reload the picker view inside the getObjectInBackgroundWithId block/closure, which is called asynchronously. I don't know if that completion block runs on a background queue or the main queue, but if it's the former, you'll have to also dispatch the reload back to the main queue.
code :


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Update UIPickerView Number of Rows

Update UIPickerView Number of Rows


By : user2443278
Date : March 29 2020, 07:55 AM
hop of those help? When you add something to your array can't you use [UIPickerView reloadAllComponents] or - (void)reloadComponent:(NSInteger)component?
That will most likely query your delegate and call everything necessary to check your array and reload the view.
Why isn't UIPickerView showing rows? swift

Why isn't UIPickerView showing rows? swift


By : raeve
Date : March 29 2020, 07:55 AM
Any of those help I'm trying to make a single UIPickerView with 2 components, each with a different amount of rows. I thought that I could base the row number per component on the index of the component, but when I run my app the UIPickerView displays only one single blank row and doesn't allow scrolling. , I believe you should return non-empty title to make it work
code :
...

// level and letter are predefined ints

func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {

    if component == 0 {
        level = row
    } else if component == 1 {
        letter = row
    }
    return "Component: \(component) Row: \(row)" // whatever string you want to display
}
UIPickerView: Reload all components from another swift file

UIPickerView: Reload all components from another swift file


By : Richard Lindner
Date : March 29 2020, 07:55 AM
Any of those help I have 2 UIPickerViews in my ViewController. Each picker view has a separate swift file which acts as the picker's datasource and delegate. I want the number of rows in the second pickerView to depend on the row selected in the first pickerView. When I try to implement this in the "didSelect" function of the first pickerView I get an error: "unexpectedly found nil while unwrapping an Optional value" , The only problem I see in your didSelectRow function i.e.
code :
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
chaptersClass = ChaptersClass()
**viewController = ViewController()**
switch row {
  case 0:
    chaptersClass.chaptersList = chaptersClass.chaptersList0
  case 1:
    chaptersClass.chaptersList = chaptersClass.chaptersList1
  case 2:
    chaptersClass.chaptersList = chaptersClass.chaptersList2
  default:
    return
}
viewController.chapterPickerView.reloadAllComponents()
Xcode Swift 4 calling self.tableView.reload() to reduce number of cell rows

Xcode Swift 4 calling self.tableView.reload() to reduce number of cell rows


By : spCl
Date : March 29 2020, 07:55 AM
This might help you After deleting the record from the datasource array you can directly call:
code :
 self.tableView.deleteRows(at: [indexPathForDeltedItem], with: .automatic)
Change number of displayed rows in UIPickerView

Change number of displayed rows in UIPickerView


By : Jeremy Max Goldman
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , You can set the height of the rows in a UIPickerview using the following UIPickerViewDelegate method
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