android - Xamarin.Forms Timepicker IsVisible 属性与自定义渲染器
<p><p>在 Xamarin.Forms 中，我使用 TimePicker 控件让用户选择时间以进行计划。为此，我使用自定义渲染器，因为我需要将分钟间隔设置为例如30 分钟和 24 小时制。这一切都很完美，除了样式问题。我的 TimePicker 需要在标签元素上不带边框显示(我并不关心对话框中的样式)</p>
<p>来自 iOS 的 native 实现会导致 TimePicker 出现一个完整的边框。
Android 的原生实现会导致 TimePicker 出现底部边框。</p>
<p>因为 Xamarin.Forms TimePicker 没有边框属性，并且我创建的两个自定义渲染器都无法隐藏边框，所以我选择最初通过设置属性 IsVisible=false 来隐藏 TimePicker，并改为显示标签控件。这可以满足样式问题的需要，但设置此属性会导致 Android 实现忽略间隔和 24 小时设置。 iOS 实现按预期工作。</p>
<p>关于如何解决此问题的任何建议？这里似乎是一个 Android 错误或不受欢迎的实现，但仍然......我看到的唯一其他选择是创建我自己的选择器实现，这是可能的并且不难，但不是我的首选......</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>我有一个实现，你可以试试这个方法:</p>
<pre><code>using Android.Views;
using Android.Widget;
using Android.Content;
using Android.App;
using Android.Runtime;
namespace Consulta_Medica_Medico.Droid
{
public class CustomTimePicker : TimePickerRenderer
{
protected override void OnElementChanged (ElementChangedEventArgs<Xamarin.Forms.TimePicker> e)
{
base.OnElementChanged (e);
TimePickerDialogIntervals timePickerDlg = new TimePickerDialogIntervals (this.Context,
new EventHandler<TimePickerDialogIntervals.TimeSetEventArgs> (UpdateDuration),
Element.Time.Hours, Element.Time.Minutes, true);
var control = new EditText (this.Context);
control.Focusable = false;
control.FocusableInTouchMode = false;
control.Clickable = false;
control.Click += (sender, ea) => timePickerDlg.Show ();
control.Text = Element.Time.Hours.ToString ("00") + ":" + Element.Time.Minutes.ToString ("00");
SetNativeControl (control);
}
void UpdateDuration(object sender, Android.App.TimePickerDialog.TimeSetEventArgs e)
{
Element.Time = new TimeSpan (e.HourOfDay, e.Minute, 0);
Control.Text = Element.Time.Hours.ToString ("00") + ":" + Element.Time.Minutes.ToString ("00");
}
}
public class TimePickerDialogIntervals : TimePickerDialog
{
public static int TimePickerInterval = App.curUser.TimeInterval.Minutes;
//private bool _ignoreEvent = false;
public TimePickerDialogIntervals(Context context,
EventHandler<TimePickerDialog.TimeSetEventArgs> callBack, int hourOfDay, int minute, bool is24HourView)
: base(context, (sender, e) => {
try{
switch (App.curUser.TimeInterval.Minutes) {
case 15:
TimePickerInterval = 15;
callBack (sender, new TimePickerDialog.TimeSetEventArgs (e.HourOfDay, e.Minute * TimePickerInterval));
break;
case 20:
TimePickerInterval = 20;
callBack (sender, new TimePickerDialog.TimeSetEventArgs (e.HourOfDay, e.Minute * TimePickerInterval));
break;
case 30:
TimePickerInterval = 30;
callBack (sender, new TimePickerDialog.TimeSetEventArgs (e.HourOfDay, e.Minute * TimePickerInterval));
break;
case 45:
TimePickerInterval = 45;
callBack (sender, new TimePickerDialog.TimeSetEventArgs (e.HourOfDay, e.Minute * TimePickerInterval));
break;
case 0:
callBack (sender, new TimePickerDialog.TimeSetEventArgs (e.HourOfDay, e.Minute));
break;
}
}
catch (Exception ex){
Console.WriteLine(ex.Message);
}
}, hourOfDay, TimePickerInterval == 0 ? minute : minute/TimePickerInterval, is24HourView)
{
}
protected TimePickerDialogIntervals(IntPtr javaReference, JniHandleOwnership transfer) : base(javaReference, transfer)
{
}
public override void SetView(Android.Views.View view)
{
SetupMinutePicker (view);
base.SetView(view);
}
void SetupMinutePicker (Android.Views.View view)
{
var numberPicker = FindMinuteNumberPicker (view as ViewGroup);
if (numberPicker != null) {
numberPicker.MinValue = 0;
if (App.curUser.TimeInterval.Minutes != 0) {
numberPicker.MaxValue = (60 / App.curUser.TimeInterval.Minutes) - 1;
if(App.curUser.TimeInterval.Minutes == 45)
numberPicker.MaxValue = 3;
} else {
numberPicker.MaxValue = 0;
}
switch (App.curUser.TimeInterval.Minutes) {
case 15:
numberPicker.SetDisplayedValues (new String[] {"00","15","30","45"});
break;
case 20:
numberPicker.SetDisplayedValues (new String[] {"00","20","40"});
break;
case 30:
numberPicker.SetDisplayedValues (new String[] {"00","30"});
break;
case 45:
numberPicker.SetDisplayedValues (new String[] {"00","15","30","45"});
break;
case 0:
numberPicker.SetDisplayedValues (new String[] {"00"});
break;
}
}
}
protected override void OnCreate (Android.OS.Bundle savedInstanceState)
{
base.OnCreate (savedInstanceState);
GetButton((int)DialogButtonType.Negative).Visibility = Android.Views.ViewStates.Gone;
this.SetCanceledOnTouchOutside (false);
}
private NumberPicker FindMinuteNumberPicker(ViewGroup viewGroup)
{
for (var i = 0; i < viewGroup.ChildCount; i++)
{
var child = viewGroup.GetChildAt(i);
var numberPicker = child as NumberPicker;
if (numberPicker != null)
{
if (numberPicker.MaxValue == 59)
{
return numberPicker;
}
}
var childViewGroup = child as ViewGroup;
if (childViewGroup != null)
{
var childResult = FindMinuteNumberPicker (childViewGroup);
if(childResult !=null)
return childResult;
}
}
return null;
}
}
}
</code></pre></p>
<p style="font-size: 20px;">关于android - Xamarin.Forms Timepicker IsVisible 属性与自定义渲染器，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/32314484/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/32314484/
</a>
</p>
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