Is it possible to change global text in a UIPickerView?

Question

I am having problems with two of my pickerViews. I am wondering if it is possible to change the color of the global text of my pickerViews in an AppDelegate file?

I know some things can be done, for example:

UIPickerView.appearance().backgroundColor = color6 UIPickerView.appearance().tintColor = color4 

If I need to write it in my code manually in each pickerView. What type of pickerView should be encoded, titleForRow?

Answer 1

Try using the following class. I subclassed UIPickerView and pointed colors inside. This is working fine. when you install items. he will install the delegate and data source himself and do the work for you.

  import UIKit class CustomUIPickerView: UIPickerView{ let textColor: UIColor = .white let backGroundColor: UIColor = .blue let _tintColor: UIColor = .white var items: [String]?{ didSet{ self.delegate = self self.dataSource = self self.reloadAllComponents() } } override init(frame: CGRect) { super.init(frame: frame) commonInit() } func commonInit(){ self.backgroundColor = backGroundColor self.tintColor = _tintColor } required init?(coder aDecoder: NSCoder) { super.init(coder: aDecoder) commonInit() } } extension CustomUIPickerView: UIPickerViewDataSource{ func numberOfComponents(in pickerView: UIPickerView) -> Int { return 1 } func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int { return self.items?.count ?? 0 } } extension CustomUIPickerView: UIPickerViewDelegate{ func pickerView(_ pickerView: UIPickerView, attributedTitleForRow row: Int, forComponent component: Int) -> NSAttributedString? { let string = self.items?[row] ?? "" return NSAttributedString(string: string, attributes: [NSAttributedStringKey.foregroundColor: textColor]) } } 

However, if you want to handle the delegate and data source in the view controller, you can take advantage of the use of Extensions , here's how:

 extension String{ func stringForPickerView() -> NSAttributedString{ let color: UIColor = .white return NSAttributedString(string: self, attributes: [NSAttributedStringKey.foregroundColor: color]) } } 

then in your ViewController:

 extension ViewController: UIPickerViewDelegate{ func pickerView(_ pickerView: UIPickerView, attributedTitleForRow row: Int, forComponent component: Int) -> NSAttributedString? { return self.items[row].stringForPickerView() // from Extension } }