[英]Xamarin.ios add DatePickerView and PickerView in AlertController
可以将DatePicker和PickerView放在xamarin.ios的Alert控制器中吗? 范例图片
我已经试过了:
UIDatePicker datePickerView = new UIDatePicker(new CGRect(0, 0, this.View.Frame.Width, 300));
var calendar = new NSCalendar(NSCalendarType.Gregorian);
var currentDate = NSDate.Now;
var components = new NSDateComponents();
components.Year = -60;
NSDate minDate = calendar.DateByAddingComponents(components, NSDate.Now, NSCalendarOptions.None);
datePickerView.MinimumDate = minDate;
datePickerView.MaximumDate = NSDate.Now;
datePickerView.Mode = UIDatePickerMode.Date;
UIAlertController actionSheetAlert = UIAlertController.Create("Data di nascita", "Seleziona un'opzione dalla lista", UIAlertControllerStyle.ActionSheet);
actionSheetAlert.View.AddSubview(datePickerView);
actionSheetAlert.AddAction(UIAlertAction.Create("Aggiungi", UIAlertActionStyle.Default, (action) => {
}));
actionSheetAlert.AddAction(UIAlertAction.Create("Cancel", UIAlertActionStyle.Destructive, (action) => Console.WriteLine("Cancel button pressed.")));
this.PresentViewController(actionSheetAlert, true, null);
这是结果: 结果图像
你能提供一个完整的例子吗? 谢谢!!!!
从Apple文档中 :
UIAlertController类旨在按原样使用,不支持子类化。 此类的视图层次结构是私有的,不能修改。
您可以使用的是自定义控制器或从头开始构建的视图,您可以模态显示和关闭它们并对其进行完全控制。
我认为您可以在AlertController上获得的最高级别的自定义设置是:
我认为我们可以创建自己的UITextField
来从您的屏幕截图中获得效果,这是我自定义的textField,供您参考:
public class MyTextField : UITextField
{
private UIDatePicker inputView;
private UIView inputAccessoryView;
public override UIView InputView
{
get
{
if (inputView == null)
{
UIDatePicker datePickerView = new UIDatePicker();
var calendar = new NSCalendar(NSCalendarType.Gregorian);
var currentDate = NSDate.Now;
var components = new NSDateComponents();
components.Year = -60;
NSDate minDate = calendar.DateByAddingComponents(components, NSDate.Now, NSCalendarOptions.None);
datePickerView.MinimumDate = minDate;
datePickerView.MaximumDate = NSDate.Now;
datePickerView.Mode = UIDatePickerMode.Date;
inputView = datePickerView;
}
return inputView;
}
}
public override UIView InputAccessoryView
{
get
{
if (inputAccessoryView == null)
{
UIToolbar toolbar = new UIToolbar(new CGRect(0, 0, UIScreen.MainScreen.Bounds.Size.Width, 44));
UIBarButtonItem item = new UIBarButtonItem(UIBarButtonSystemItem.Done, (sender, args) =>
{
NSDateFormatter formatter = new NSDateFormatter();
formatter.DateFormat = "dd/MM/yyyy HH:mm";
this.Text = formatter.ToString(inputView.Date);
this.ResignFirstResponder();
});
UIBarButtonItem flexibleItem = new UIBarButtonItem(UIBarButtonSystemItem.FlexibleSpace, null);
toolbar.SetItems((new UIBarButtonItem[] { flexibleItem, item }), false);
inputAccessoryView = toolbar;
}
return inputAccessoryView;
}
}
}
覆盖InputView
(将您的datePicker放入其中)和InputAccessoryView
(带有“完成”的工具栏)
最后,我们可以像这样使用它:
MyTextField textField = new MyTextField();
textField.Placeholder = "Enter something";
textField.Frame = new CGRect(0, 100, 200, 200);
View.AddSubview(textField);
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