iOS 14 系统取色器
let picker = UIColorPickerViewController()
picker.delegate = self
present(picker, animated: true, completion: nil)
func colorPickerViewControllerDidFinish(_ viewController: UIColorPickerViewController) {
dismiss(animated: true, completion: nil)
}
func colorPickerViewControllerDidSelectColor(_ viewController: UIColorPickerViewController) {
let color = viewController.selectedColor
}
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