CodeGo.net>如何在Xamarin形式设置MasterDetailPage的宽度

概述我在iOS和android的Xamarin表单上使用MasterDetailPageforapp.但是MasterDetailPage菜单中的宽度太大,我想对其进行调整.如何在Android和iOS上为MasterDetailPage设置自定义宽度？我的MasterDetailPage初始化代码：MyChatsMasterView_myChatsMasterView;

我在iOS和android的Xamarin表单上使用MasterDetailPage for app.

但是MasterDetailPage菜单中的宽度太大,我想对其进行调整.

如何在Android和iOS上为MasterDetailPage设置自定义宽度？

我的MasterDetailPage初始化代码：

            MyChatsMasterVIEw _myChatsMasterVIEw;            MyChatsVIEw _myChatsVIEw;            public MyChatsMasterDetailVIEw(MyChatsMasterVIEw myChatsMasterVIEw, MyChatsVIEw myChatsVIEw)            {                NavigationPage.SetHasNavigationbar(this, false);                InitializeComponent();                this.MasterBehavior = MasterBehavior.Popover;                _myChatsMasterVIEw = myChatsMasterVIEw;                _myChatsVIEw = myChatsVIEw;                Master = _myChatsMasterVIEw;                Detail = _myChatsVIEw;                _myChatsMasterVIEw.SetDetailVIEw(this);            }

解决方法:

我通过从Xamarin.Forms源复制渲染器解决了该问题.
基本上,我需要一个宽度为400 dp的母版,以便在其中正确显示日历.

这是我所做的：

共享图书馆

我创建了一个从MasterDetail页面派生的SplitVIEwPage：

<?xml version="1.0" enCoding="utf-8" ?><MasterDetailPage xmlns="http://xamarin.com/schemas/2014/forms"             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"             x:Class="CompApp.VIEws.SplitVIEwPage">    <MasterDetailPage.Master>        <ContentPage title=" "/>    </MasterDetailPage.Master>    <MasterDetailPage.Detail>        <ContentPage title=" "/>    </MasterDetailPage.Detail></MasterDetailPage>

安卓系统

由于主宽度是内部类’MasterDetailContainer’中的常量,因此我从基类复制了代码(请参见here)
更改为名为“ DroIDMasterDetailContainer.cs”的新类,同时将类的可见性从内部更改为公共.

我对代码进行了两项更改：

>我将const int DefaultMasterSize = 320更改为const int DefaultMasterSize = 400
>我将_childVIEw.ClearValue(Platform.rendererProperty)行注释掉； (第116行,由于无法访问Platform.rendererProperty,因此位于voID disposeChildRenderers()中)

下一步是将MasterDetailRenderer的代码(请参见here)复制到新类(在我的情况下为’SplitVIEwPageRenderer.cs’)

using System;using System.ComponentModel;using System.linq;using System.Threading.Tasks;using AndroID.App;using AndroID.Content;using AndroID.OS;using AndroID.Support.V4.Widget;using AndroID.VIEws;using MyApp.DroID.Renderer;using Xamarin.Forms;using Xamarin.Forms.Platform.AndroID;using Xamarin.Forms.Platform.AndroID.AppCompat;using Acolor = AndroID.Graphics.Drawables.colorDrawable;using AVIEw = AndroID.VIEws.VIEw;[assembly: ExportRenderer(typeof(SplitVIEwPage), typeof(SplitVIEwPageRenderer))]namespace MyApp.DroID.Renderer{public class SplitVIEwPageRenderer : DrawerLayout, IVisualElementRenderer, DrawerLayout.IDrawerListener{    public SplitVIEwPageRenderer(Context context) : base(context)    {    }    //from AndroID source code    const uint DefaultScrimcolor = 0x99000000;    int _currentLockMode = -1;    DroIDMasterDetailContainer _detailLayout;    bool _isPresentingFromCore;    DroIDMasterDetailContainer _masterLayout;    MasterDetailPage _page;    bool _presented;    [Obsolete("This constructor is obsolete as of version 2.5. Please use MasterDetailRenderer(Context) instead.")]    public SplitVIEwPageRenderer() : base(Forms.Context)    {    }    IMasterDetailPageController MasterDetailPageController => _page as IMasterDetailPageController;    public bool Presented    {        get { return _presented; }        set        {            if (value == _presented)                return;            UpdateSplitVIEwLayout();            _presented = value;            if (_page.MasterBehavior == MasterBehavior.Default && MasterDetailPageController.ShouldShowSplitMode)                return;            if (_presented)                OpenDrawer(_masterLayout);            else                CloseDrawer(_masterLayout);        }    }    IPageController MasterPageController => _page.Master as IPageController;    IPageController DetailPageController => _page.Detail as IPageController;    IPageController PageController => Element as IPageController;    public voID OnDrawerClosed(AVIEw drawerVIEw)    {    }    public voID OnDrawerOpened(AVIEw drawerVIEw)    {    }    public voID OnDrawerSlIDe(AVIEw drawerVIEw, float slIDeOffset)    {    }    public voID OnDrawerStateChanged(int newState)    {        _presented = IsDrawerVisible(_masterLayout);        UpdateIsPresented();    }    public VisualElement Element    {        get { return _page; }    }    public event EventHandler<VisualElementChangedEventArgs> ElementChanged;    event EventHandler<PropertyChangedEventArgs> ElementPropertyChanged;    event EventHandler<PropertyChangedEventArgs> IVisualElementRenderer.ElementPropertyChanged    {        add { ElementPropertyChanged += value; }        remove { ElementPropertyChanged -= value; }    }    public SizeRequest GetDesiredSize(int wIDthConstraint, int heightConstraint)    {        Measure(wIDthConstraint, heightConstraint);        return new SizeRequest(new Size(MeasureDWIDth, MeasuredHeight));    }    public voID SetElement(VisualElement element)    {        MasterDetailPage oldElement = _page;        _page = element as MasterDetailPage;        _detailLayout = new DroIDMasterDetailContainer(_page, false, Context) { LayoutParameters = new LayoutParams(VIEwGroup.LayoutParams.WrapContent, VIEwGroup.LayoutParams.WrapContent) };        _masterLayout = new DroIDMasterDetailContainer(_page, true, Context)        {            LayoutParameters = new LayoutParams(VIEwGroup.LayoutParams.WrapContent, VIEwGroup.LayoutParams.WrapContent) { Gravity = (int)GravityFlags.Start }        };        AddVIEw(_detailLayout);        AddVIEw(_masterLayout);        var activity = Context as Activity;        activity.Actionbar.SetdisplayShowHomeEnabled(true);        activity.Actionbar.SetHomebuttonEnabled(true);        UpdateBackgroundcolor(_page);        UpdateBackgroundImage(_page);        OnElementChanged(oldElement, element);        if (oldElement != null)            ((IMasterDetailPageController)oldElement).Backbuttonpressed -= OnBackbuttonpressed;        if (_page != null)            MasterDetailPageController.Backbuttonpressed += OnBackbuttonpressed;        if (Tracker == null)            Tracker = new VisualElementTracker(this);        _page.PropertyChanged += HandlePropertyChanged;        _page.Appearing += MasterDetailPageAppearing;        _page.disappearing += MasterDetailPagedisappearing;        UpdateMaster();        UpdateDetail();        Device.Info.PropertyChanged += DeviceInfoPropertyChanged;        SetGestureState();        Presented = _page.IsPresented;        AddDrawerListener(this);        //if (element != null)        //  element.SendVIEwInitialized(this);        if (element != null && !string.IsNullOrEmpty(element.automationID))            ContentDescription = element.automationID;    }    public VisualElementTracker Tracker { get; private set; }    public voID UpdateLayout()    {        if (Tracker != null)            Tracker.UpdateLayout();    }    public VIEwGroup VIEwGroup => this;    AVIEw IVisualElementRenderer.VIEw => this;    protected overrIDe voID dispose(bool disposing)    {        if (disposing)        {            if (Tracker != null)            {                Tracker.dispose();                Tracker = null;            }            if (_detailLayout != null)            {                _detailLayout.dispose();                _detailLayout = null;            }            if (_masterLayout != null)            {                _masterLayout.dispose();                _masterLayout = null;            }            Device.Info.PropertyChanged -= DeviceInfoPropertyChanged;            if (_page != null)            {                MasterDetailPageController.Backbuttonpressed -= OnBackbuttonpressed;                _page.PropertyChanged -= HandlePropertyChanged;                _page.Appearing -= MasterDetailPageAppearing;                _page.disappearing -= MasterDetailPagedisappearing;                //_page.ClearValue(Platform.rendererProperty);                _page = null;            }        }        base.dispose(disposing);    }    protected overrIDe voID OnAttachedToWindow()    {        base.OnAttachedToWindow();        PageController.SendAppearing();    }    protected overrIDe voID OnDetachedFromWindow()    {        base.OnDetachedFromWindow();        PageController.Senddisappearing();    }    protected virtual voID OnElementChanged(VisualElement oldElement, VisualElement newElement)    {        EventHandler<VisualElementChangedEventArgs> changed = ElementChanged;        if (changed != null)            changed(this, new VisualElementChangedEventArgs(oldElement, newElement));    }    protected overrIDe voID OnLayout(bool changed, int l, int t, int r, int b)    {        base.OnLayout(changed, l, t, r, b);        //Hack to make the split layout handle touches the full wIDth        if (MasterDetailPageController.ShouldShowSplitMode && _masterLayout != null)            _masterLayout.Right = r;    }    async voID DeviceInfoPropertyChanged(object sender, PropertyChangedEventArgs e)    {        if (e.Propertyname == "CurrentOrIEntation")        {            if (!MasterDetailPageController.ShouldShowSplitMode && Presented)            {                MasterDetailPageController.CanChangeIsPresented = true;                //Hack : when the orIEntation changes and we try to close the Master on AndroID                     //sometimes AndroID picks the wIDth of the screen prevIoUs to the rotation                      //this leaves a little of the master visible, the Hack is to delay for 50ms closing the drawer                await Task.Delay(50);                CloseDrawer(_masterLayout);            }            UpdateSplitVIEwLayout();        }    }    voID HandleMasterPropertyChanged(object sender, PropertyChangedEventArgs e)    {        //if (e.Propertyname == Page.TitleProperty.Propertyname || e.Propertyname == Page.IconProperty.Propertyname)            //((Platform)_page.Platform).UpdateMasterDetailToggle(true);    }    voID HandlePropertyChanged(object sender, PropertyChangedEventArgs e)    {        ElementPropertyChanged?.Invoke(this, e);        if (e.Propertyname == "Master")            UpdateMaster();        else if (e.Propertyname == "Detail")        {            UpdateDetail();            //((Platform)_page.Platform).UpdateActionbar();        }        else if (e.Propertyname == MasterDetailPage.IsPresentedProperty.Propertyname)        {            _isPresentingFromCore = true;            Presented = _page.IsPresented;            _isPresentingFromCore = false;        }        else if (e.Propertyname == "IsGestureEnabled")            SetGestureState();        else if (e.Propertyname == Page.BackgroundImageProperty.Propertyname)            UpdateBackgroundImage(_page);        if (e.Propertyname == VisualElement.BackgroundcolorProperty.Propertyname)            UpdateBackgroundcolor(_page);    }    voID MasterDetailPageAppearing(object sender, EventArgs e)    {        MasterPageController?.SendAppearing();        DetailPageController?.SendAppearing();    }    voID MasterDetailPagedisappearing(object sender, EventArgs e)    {        MasterPageController?.Senddisappearing();        DetailPageController?.Senddisappearing();    }    voID OnBackbuttonpressed(object sender, BackbuttonpressedEventArgs backbuttonpressedEventArgs)    {        if (IsDrawerOpen((int)GravityFlags.Start))        {            if (_currentLockMode != LockModeLockedOpen)            {                CloseDrawer((int)GravityFlags.Start);                backbuttonpressedEventArgs.Handled = true;            }        }    }    voID SetGestureState()    {        SetDrawerLockMode(_page.IsGestureEnabled ? LockModeUnlocked : LockModeLockedClosed);    }    voID IVisualElementRenderer.SetLabelFor(int? ID)    {    }    voID SetLockMode(int lockMode)    {        if (_currentLockMode != lockMode)        {            SetDrawerLockMode(lockMode);            _currentLockMode = lockMode;        }    }    voID UpdateBackgroundcolor(Page vIEw)    {        if (vIEw.Backgroundcolor != color.Default)            SetBackgroundcolor(vIEw.Backgroundcolor.ToAndroID());    }    voID UpdateBackgroundImage(Page vIEw)    {        if (!string.IsNullOrEmpty(vIEw.BackgroundImage))            this.SetBackground(Context.GetDrawable(vIEw.BackgroundImage));    }    voID UpdateDetail()    {        Context.HIDeKeyboard(this);        _detailLayout.ChildVIEw = _page.Detail;    }    voID UpdateIsPresented()    {        if (_isPresentingFromCore)            return;        if (Presented != _page.IsPresented)            ((IElementController)_page).SetValueFromrenderer(MasterDetailPage.IsPresentedProperty, Presented);    }    voID UpdateMaster()    {        if (_masterLayout != null && _masterLayout.ChildVIEw != null)            _masterLayout.ChildVIEw.PropertyChanged -= HandleMasterPropertyChanged;        _masterLayout.ChildVIEw = _page.Master;        if (_page.Master != null)            _page.Master.PropertyChanged += HandleMasterPropertyChanged;    }    voID UpdateSplitVIEwLayout()    {        if (Device.Idiom == TargetIdiom.tablet)        {            bool isShowingSplit = MasterDetailPageController.ShouldShowSplitMode                || (MasterDetailPageController.ShouldShowSplitMode && _page.MasterBehavior != MasterBehavior.Default && _page.IsPresented);            SetLockMode(isShowingSplit ? LockModeLockedOpen : LockModeUnlocked);            unchecked            {                SetScrimcolor(isShowingSplit ? color.transparent.ToAndroID() : (int)DefaultScrimcolor);            }            //((Platform)_page.Platform).UpdateMasterDetailToggle();        }    }}}

请注意,我们使用的是之前创建的’DroIDMasterDetailContainer’,而不是对变量_masterLayout和_detailLayout使用内部类’MasterDetailContainer’.

的iOS

基本上是相同的故事：使用MasterDetailRenderer代码(请参见here),创建您自己的类,粘贴代码和一些改编,稍后我们将：

using CompApp.Customs;using MyApp.iOS.Renderer;using System;using System.Collections.Generic;using System.Text;using Xamarin.Forms;using Xamarin.Forms.Platform.iOS;using System.ComponentModel;using CoreGraphics;using MyApp.VIEws;using UIKit;using Xamarin.Forms.Internals;using System.Reflection;[assembly: ExportRenderer(typeof(SplitVIEwPage), typeof(SplitVIEwPageRenderer))]namespace MyApp.iOS.Renderer{public class SplitVIEwPageRenderer : UISplitVIEwController, IVisualElementRenderer, IEffectControlProvIDer{    UIVIEwController _detailController;    bool _disposed;    EventTracker _events;    InnerDelegate _innerDelegate;    public static nfloat MasterWIDth = 400;    EventedVIEwController _masterController;    SplitVIEwPage _masterDetailPage;    bool _masterVisible;    VisualElementTracker _tracker;    Page PageController => Element as Page;    Element ElementController => Element as Element;    protected SplitVIEwPage MasterDetailPage => _masterDetailPage ?? (_masterDetailPage = (SplitVIEwPage)Element);    public VisualElement Element { get; private set; }    public event EventHandler<VisualElementChangedEventArgs> ElementChanged;    UIbarbuttonItem Presentbutton    {        get { return _innerDelegate == null ? null : _innerDelegate.Presentbutton; }    }    public UIVIEw NativeVIEw    {        get { return VIEw; }    }    protected virtual voID OnElementChanged(VisualElementChangedEventArgs e)    {        if (e.oldElement != null)            e.oldElement.PropertyChanged -= HandlePropertyChanged;        if (e.NewElement != null)        {            e.NewElement.PropertyChanged += HandlePropertyChanged;        }        if (UIDevice.CurrentDevice.OrIEntation == UIDeviceOrIEntation.Landscapeleft || UIDevice.CurrentDevice.OrIEntation == UIDeviceOrIEntation.LandscapeRight)        {            PreferreddisplayMode = UISplitVIEwControllerdisplayMode.AllVisible;        }        else if (UIDevice.CurrentDevice.OrIEntation == UIDeviceOrIEntation.Portrait || UIDevice.CurrentDevice.OrIEntation == UIDeviceOrIEntation.PortraitUpsIDeDown)        {            PreferreddisplayMode = UISplitVIEwControllerdisplayMode.PrimaryOverlay;        }        MasterWIDth = 400;        MasterDetailPage.Master.WIDthRequest = 400;        MasterDetailPage.UpdateMasterBehavior();        var changed = ElementChanged;        if (changed != null)            changed(this, e);        UpdateControllers();    }    public SizeRequest GetDesiredSize(double wIDthConstraint, double heightConstraint)    {        return NativeVIEw.GetSizeRequest(wIDthConstraint, heightConstraint);    }    public voID SetElement(VisualElement element)    {        var oldElement = Element;        Element = element;        VIEwControllers = new[] { _masterController = new EventedVIEwController(), _detailController = new ChildVIEwController() };        Delegate = _innerDelegate = new InnerDelegate(MasterDetailPage.MasterBehavior);        Element.Backgroundcolor = color.transparent;        UpdateControllers();        _masterController.WillAppear += MasterControllerWillAppear;        _masterController.Willdisappear += MasterControllerWilldisappear;        PresentsWithGesture = MasterDetailPage.IsGestureEnabled;        OnElementChanged(new VisualElementChangedEventArgs(oldElement, element));        EffectUtilitIEs.RegisterEffectControlProvIDer(this, oldElement, element);        if (element != null)        {            MethodInfo sendVIEwInitialized = typeof(Xamarin.Forms.Forms).getmethod("SendVIEwInitialized", BindingFlags.Static | BindingFlags.NonPublic);            sendVIEwInitialized?.Invoke(element, new object[] { element, NativeVIEw });        }    }    public voID SetElementSize(Size size)    {        Element.Layout(new Rectangle(Element.X, Element.WIDth, size.WIDth, size.Height));    }    public UIVIEwController VIEwController    {        get { return this; }    }    public overrIDe voID VIEwDIDAppear(bool animated)    {        PageController.SendAppearing();        base.VIEwDIDAppear(animated);        ToggleMaster();    }    public overrIDe voID VIEwDIDdisappear(bool animated)    {        base.VIEwDIDdisappear(animated);        PageController?.Senddisappearing();    }    public overrIDe voID VIEwDIDLayoutSubvIEws()    {        if (VIEw.SubvIEws.Length < 2)            return;        var frameBounds = VIEw.Bounds;        var masterBounds = _masterController.VIEw.Frame;        var detailsBounds = _detailController.VIEw.Frame;        nfloat statusbarHeight = UIApplication.SharedApplication.StatusbarFrame.Height;        masterBounds.WIDth = 400;        MasterWIDth = (nfloat)Math.Max(MasterWIDth, masterBounds.WIDth);        if (Xamarin.Forms.Device.Idiom == TargetIdiom.tablet)        {            bool interfaceInLandscape = UIApplication.SharedApplication.StatusbarOrIEntation == UIInterfaceOrIEntation.Landscapeleft || UIApplication.SharedApplication.StatusbarOrIEntation == UIInterfaceOrIEntation.LandscapeRight;            if (UIDevice.CurrentDevice.OrIEntation == UIDeviceOrIEntation.Landscapeleft || UIDevice.CurrentDevice.OrIEntation == UIDeviceOrIEntation.LandscapeRight || interfaceInLandscape)            {                detailsBounds.X = 400;                detailsBounds.WIDth = frameBounds.WIDth - 400;            }            else            {                detailsBounds.X = 0;                detailsBounds.WIDth = frameBounds.WIDth;            }            _detailController.VIEw.Frame = detailsBounds;            _masterController.VIEw.Frame = new CGRect(masterBounds.X, masterBounds.Y, masterBounds.WIDth, masterBounds.Height);            if (!masterBounds.IsEmpty)            {                MasterDetailPage.MasterBounds = new Rectangle(masterBounds.X, masterBounds.Y, masterBounds.WIDth, masterBounds.Height);            }            if (!detailsBounds.IsEmpty)            {                MasterDetailPage.DetailBounds = new Rectangle(detailsBounds.X, detailsBounds.Y, detailsBounds.WIDth, detailsBounds.Height);            }            _masterController.VIEw.SetNeedsLayout();            _detailController.VIEw.SetNeedsLayout();        }        else        {            if (!masterBounds.IsEmpty)            {                MasterDetailPage.MasterBounds = new Rectangle(MasterWIDth, 0, MasterWIDth, masterBounds.Height);            }            if (!detailsBounds.IsEmpty)            {                MasterDetailPage.DetailBounds = new Rectangle(0, 0, detailsBounds.WIDth, detailsBounds.Height);            }        }    }    public overrIDe voID VIEwDIDLoad()    {        base.VIEwDIDLoad();        UpdateBackground();        UpdateFlowDirection();        _tracker = new VisualElementTracker(this);        _events = new EventTracker(this);        _events.LoadEvents(NativeVIEw);    }    public overrIDe voID VIEwWilldisappear(bool animated)    {        if (_masterVisible)            PerformbuttonSelector();        base.VIEwWilldisappear(animated);    }    public overrIDe voID VIEwWillLayoutSubvIEws()    {        base.VIEwWillLayoutSubvIEws();        _masterController.VIEw.Backgroundcolor = UIcolor.White;        CGRect bounds = _masterController.VIEw.Bounds;        CGRect frame = _masterController.VIEw.Frame;        (this.VIEwController as UISplitVIEwController).MinimumPrimaryColumnWIDth = 400;        (this.VIEwController as UISplitVIEwController).MaximumPrimaryColumnWIDth = 400;    }    public overrIDe voID WillRotate(UIInterfaceOrIEntation toInterfaceOrIEntation, double duration)    {        // On IOS8 the MasterVIEwController VIEwAppear/disappear weren't being called correctly after rotation         // We Now close the Master by using the new SplitVIEw API, basicly we set it to hIDden and right back to the normal/automaticMode        if (!MasterDetailPage.ShouldShowSplitMode && _masterVisible)        {            MasterDetailPage.CanChangeIsPresented = true;            PreferreddisplayMode = UISplitVIEwControllerdisplayMode.PrimaryHIDden;            PreferreddisplayMode = UISplitVIEwControllerdisplayMode.automatic;        }        var masterBounds = _masterController.VIEw.Frame;        MessagingCenter.Send<IVisualElementRenderer>(this,  "Xamarin.Updatetoolbarbuttons");        MasterDetailPage.UpdateMasterBehavior();        base.WillRotate(toInterfaceOrIEntation, duration);    }    public overrIDe voID DIDRotate(UIInterfaceOrIEntation fromInterfaceOrIEntation)    {        base.DIDRotate(fromInterfaceOrIEntation);        var masterBounds = _masterController.VIEw.Frame;        MasterWIDth = (nfloat)Math.Max(MasterWIDth, masterBounds.WIDth);        if (!masterBounds.IsEmpty)        {            MasterDetailPage.MasterBounds = new Rectangle(MasterWIDth, 0, MasterWIDth, masterBounds.Height);        }    }    public overrIDe UIVIEwController ChildVIEwControllerForStatusbarHIDden()    {        if (((MasterDetailPage)Element).Detail != null)            return (UIVIEwController)Platform.GetRenderer(((MasterDetailPage)Element).Detail);        else            return base.ChildVIEwControllerForStatusbarHIDden();    }    voID ClearControllers()    {        foreach (var controller in _masterController.ChildVIEwControllers)        {            controller.VIEw.RemoveFromSupervIEw();            controller.RemoveFromParentVIEwController();        }        foreach (var controller in _detailController.ChildVIEwControllers)        {            controller.VIEw.RemoveFromSupervIEw();            controller.RemoveFromParentVIEwController();        }    }    voID HandleMasterPropertyChanged(object sender, PropertyChangedEventArgs e)    {        if (e.Propertyname == Page.IconProperty.Propertyname || e.Propertyname == Page.TitleProperty.Propertyname)            MessagingCenter.Send<IVisualElementRenderer>(this, "Xamarin.Updatetoolbarbuttons");    }    voID HandlePropertyChanged(object sender, PropertyChangedEventArgs e)    {        if (_tracker == null)            return;        if (e.Propertyname == "Master" || e.Propertyname == "Detail")            UpdateControllers();        else if (e.Propertyname == Xamarin.Forms.MasterDetailPage.IsPresentedProperty.Propertyname)            ToggleMaster();        else if (e.Propertyname == Xamarin.Forms.MasterDetailPage.IsGestureEnabledProperty.Propertyname)            base.PresentsWithGesture = this.MasterDetailPage.IsGestureEnabled;        else if (e.Propertyname == "FlowDirection")            UpdateFlowDirection();        MessagingCenter.Send<IVisualElementRenderer>(this, "Xamarin.Updatetoolbarbuttons");    }    voID MasterControllerWillAppear(object sender, EventArgs e)    {        _masterVisible = true;        if (MasterDetailPage.CanChangeIsPresented)            ElementController.SetValueFromrenderer(Xamarin.Forms.MasterDetailPage.IsPresentedProperty, true);    }    voID MasterControllerWilldisappear(object sender, EventArgs e)    {        _masterVisible = false;        if (MasterDetailPage.CanChangeIsPresented)            ElementController.SetValueFromrenderer(Xamarin.Forms.MasterDetailPage.IsPresentedProperty, false);    }    voID PerformbuttonSelector()    {        displayModebuttonItem.Target.PerformSelector(displayModebuttonItem.Action, displayModebuttonItem, 0);    }    voID ToggleMaster()    {        if (_masterVisible == MasterDetailPage.IsPresented || MasterDetailPage.ShouldShowSplitMode)            return;        PerformbuttonSelector();    }    voID UpdateBackground()    {        if (!string.IsNullOrEmpty(((Page)Element).BackgroundImage))            VIEw.Backgroundcolor = UIcolor.FromPatternImage(UIImage.FromBundle(((Page)Element).BackgroundImage));        else if (Element.Backgroundcolor == color.Default)            VIEw.Backgroundcolor = UIcolor.White;        else            VIEw.Backgroundcolor = Element.Backgroundcolor.ToUIcolor();    }    voID UpdateControllers()    {        MasterDetailPage.Master.PropertyChanged -= HandleMasterPropertyChanged;        if (Platform.GetRenderer(MasterDetailPage.Master) == null)            Platform.SetRenderer(MasterDetailPage.Master, Platform.CreateRenderer(MasterDetailPage.Master));        if (Platform.GetRenderer(MasterDetailPage.Detail) == null)            Platform.SetRenderer(MasterDetailPage.Detail, Platform.CreateRenderer(MasterDetailPage.Detail));        ClearControllers();        MasterDetailPage.Master.PropertyChanged += HandleMasterPropertyChanged;        var master = Platform.GetRenderer(MasterDetailPage.Master).VIEwController;        var detail = Platform.GetRenderer(MasterDetailPage.Detail).VIEwController;        _masterController.VIEw.AddSubvIEw(master.VIEw);        _masterController.AddChildVIEwController(master);        _detailController.VIEw.AddSubvIEw(detail.VIEw);        _detailController.AddChildVIEwController(detail);    }    voID UpdateFlowDirection()    {        bool ios9orLater = UIDevice.CurrentDevice.CheckSystemVersion(9, 0);        if (NativeVIEw == null || VIEw == null || !ios9orLater)            return;        VIEw.SemanticContentAttribute = UISemanticContentAttribute.ForceleftToRight;    }    class InnerDelegate : UISplitVIEwControllerDelegate    {        Readonly MasterBehavior _masterPresentedDefaultState;        public InnerDelegate(MasterBehavior masterPresentedDefaultState)        {            _masterPresentedDefaultState = masterPresentedDefaultState;        }        public UIbarbuttonItem Presentbutton { get; set; }        public overrIDe bool ShouldHIDeVIEwController(UISplitVIEwController svc, UIVIEwController vIEwController, UIInterfaceOrIEntation inorIEntation)        {            bool willHIDeVIEwController;            switch (_masterPresentedDefaultState)            {                case MasterBehavior.Split:                    willHIDeVIEwController = false;                    break;                case MasterBehavior.Popover:                    willHIDeVIEwController = true;                    break;                case MasterBehavior.SplitOnPortrait:                    willHIDeVIEwController = !(inorIEntation == UIInterfaceOrIEntation.Portrait || inorIEntation == UIInterfaceOrIEntation.PortraitUpsIDeDown);                    break;                default:                    willHIDeVIEwController = inorIEntation == UIInterfaceOrIEntation.Portrait || inorIEntation == UIInterfaceOrIEntation.PortraitUpsIDeDown;                    break;            }            return willHIDeVIEwController;        }        public overrIDe voID WillHIDeVIEwController(UISplitVIEwController svc, UIVIEwController aVIEwController, UIbarbuttonItem barbuttonItem, UIPopoverController pc)        {            Presentbutton = barbuttonItem;        }    }    voID IEffectControlProvIDer.RegisterEffect(Effect effect)    {        VisualElementRenderer<VisualElement>.RegisterEffect(effect, VIEw);    }    protected overrIDe voID dispose(bool disposing)    {        if (_disposed)        {            return;        }        _disposed = true;        if (disposing)        {            if (Element != null)            {                PageController.Senddisappearing();                Element.PropertyChanged -= HandlePropertyChanged;                if (MasterDetailPage?.Master != null)                {                    MasterDetailPage.Master.PropertyChanged -= HandleMasterPropertyChanged;                }                Element = null;            }            if (_tracker != null)            {                _tracker.dispose();                _tracker = null;            }            if (_events != null)            {                _events.dispose();                _events = null;            }            if (_masterController != null)            {                _masterController.WillAppear -= MasterControllerWillAppear;                _masterController.Willdisappear -= MasterControllerWilldisappear;            }            ClearControllers();        }        base.dispose(disposing);    }}internal class ChildVIEwController : UIVIEwController{    public overrIDe voID VIEwDIDLayoutSubvIEws()    {        foreach (var vc in ChildVIEwControllers)        {            CGRect rect = VIEw.Bounds;            vc.VIEw.Frame = rect;        }    }}internal class EventedVIEwController : ChildVIEwController{    public overrIDe voID VIEwWillAppear(bool animated)    {        base.VIEwWillAppear(animated);        var eh = WillAppear;        if (eh != null)            eh(this, EventArgs.Empty);    }    public overrIDe voID VIEwWilldisappear(bool animated)    {        base.VIEwWilldisappear(animated);        var eh = Willdisappear;        if (eh != null)            eh(this, EventArgs.Empty);    }    public overrIDe voID VIEwDIDLayoutSubvIEws()    {        CGRect rect = VIEw.Bounds;        VIEw.Bounds = rect;        foreach (var vc in ChildVIEwControllers)        {            rect = vc.VIEw.Frame;            vc.VIEw.Frame = rect;            rect = vc.VIEw.Bounds;            vc.VIEw.Bounds = rect;        }    }    public event EventHandler WillAppear;    public event EventHandler Willdisappear;}}

我仅使用tabletMasterDetailRenderer,因为我使用MasterDetailVIEw为平板电脑设备创建了一个特定的视图,该设备在主机内部包含一个日历视图,并在详细信息视图中显示所选条目的详细信息.

如果您需要用于手机,则也可以使用PhoneMasterDetailRenderer进行相同的更改.

总结

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