let imagePicker = UIImagePickerController()
imagePicker.navigationBar.isTranslucent = false
//导航栏颜色
imagePicker.navigationBar.barTintColor = AppColor.tint
//取消颜色
imagePicker.navigationBar.tintColor = .white
//标题颜色
imagePicker.navigationBar.titleTextAttributes = [ NSForegroundColorAttributeName: UIColor.white]
