Xamarin ios 自定义UIView 实现Alert弹窗效果

由于系统自带的AlertView和UIAlertController满足不了项目所需的要求，主要是这两个控件都实现不了，手动添加的三个Button按钮能横排显示在屏幕的中央，所以只能自己定义了！
1.首先新建一个UIView类，起名叫MyPopView
using System;
using System.Drawing;
using CoreGraphics;
using Foundation;
using UIKit;
namespace PoupUIView
{
[Register(“MyPopView”)]
public class MyPopView : UIView
{
public UIView view;
float m_width;
float m_height;
public MyPopView(RectangleF bounds) : base(bounds)
{
this.Frame = bounds;//铺满整个屏幕
}

    public override void LayoutSubviews()
    {
        base.LayoutSubviews();
        //这种写法   不仅大View是透明的，小view也跟着透明了
        //this.BackgroundColor = UIColor.Black;
        //this.Alpha = 0.5f;

        **this.BackgroundColor = UIColor.FromRGBA(0, 0, 0, 0.5f);** //让当前的View透明（遮罩层）

        //动态获取当前屏幕的宽和高（以实现横竖屏幕时弹窗始终显示在屏幕的中央）
        m_width = (float)UIScreen.MainScreen.Bounds.Width;
        m_height = (float)UIScreen.MainScreen.Bounds.Height;

        if (view == null)
        {
            view = new UIView(new CGRect((m_width - 337) / 2, (m_height - 206) / 2, 337, 206));
            view.SizeToFit();
            view.Layer.CornerRadius = 5;
            view.BackgroundColor = UIColor.White;
            view.Alpha = 1.0f;
            this.AddSubview(view);
            AddChildView();
        }       
    }

    private void AddChildView()
    {
        UILabel titleLabel = new UILabel(new CoreGraphics.CGRect(120, 18, 86, 31));
        titleLabel.Text = "编辑批注";
        titleLabel.TextColor = UIColor.Black;
        titleLabel.SizeToFit();
        view.AddSubview(titleLabel);

        UILabel  userInfo = new UILabel(new CoreGraphics.CGRect(45, 57, 242, 21));
        userInfo.Text = "用户：李四时间：2018/3/7/15.00.18";
        userInfo.Font = UIFont.SystemFontOfSize(13);
        userInfo.TextColor = UIColor.Black;
        userInfo.SizeToFit();
        view.AddSubview(userInfo);

        UIProgressView progressView = new UIProgressView(new CoreGraphics.CGRect(45, 98, 247, 9));
        progressView.Progress = 100;
        view.AddSubview(progressView);

        UIButton button1 = new UIButton(new CoreGraphics.CGRect(45, 115, 67, 30));
        button1.SetTitle("播放", UIControlState.Normal);
        button1.TouchUpInside += Button1_TouchUpInside;
        button1.BackgroundColor = UIColor.Gray;

        UIButton button2 = new UIButton(new CoreGraphics.CGRect(132, 115, 67, 30));
        button2.SetTitle("停止", UIControlState.Normal);
        button2.TouchUpInside += Button2_TouchUpInside;
        button2.BackgroundColor = UIColor.Gray;

        UIButton button3 = new UIButton(new CoreGraphics.CGRect(221, 115, 67, 30));
        button3.SetTitle("重录", UIControlState.Normal);
        button3.TouchUpInside += Button3_TouchUpInside;
        button3.BackgroundColor = UIColor.Gray;

        view.AddSubview(button1);
        view.AddSubview(button2);
        view.AddSubview(button3);

        UIButton button4 = new UIButton(new CoreGraphics.CGRect(20, 159, 62, 30));
        button4.SetTitle("移动", UIControlState.Normal);
        button4.SetTitleColor(UIColor.Black, UIControlState.Normal);
        view.AddSubview(button4);
        button4.TouchUpInside += Button4_TouchUpInside;

        UIButton button5 = new UIButton(new CoreGraphics.CGRect(255, 159, 62, 30));
        button5.SetTitle("删除", UIControlState.Normal);
        button5.SetTitleColor(UIColor.Black, UIControlState.Normal);
        view.AddSubview(button5);
        button5.TouchUpInside += Button5_TouchUpInside;
    }

    public override void TouchesBegan(NSSet touches, UIEvent evt)
    {
        //base.TouchesBegan(touches, evt);

        UITouch touch = touches.AnyObject as UITouch;
        if (touch.View == view)
        {
            return;
        }
        this.RemoveFromSuperview();
    }

    private void Button5_TouchUpInside(object sender, EventArgs e)
    {
        Console.WriteLine("您点击了删除！！！");
        // this.Hidden = true;  让当前的大View隐藏
        this.RemoveFromSuperview();   //移除当前的View
    }

    private void Button4_TouchUpInside(object sender, EventArgs e)
    {
        Console.WriteLine("您点击了移动！！！");
    }

    private void Button3_TouchUpInside(object sender, EventArgs e)
    {
        Console.WriteLine("您点击了重录！！！");
    }

    private void Button2_TouchUpInside(object sender, EventArgs e)
    {
        Console.WriteLine("您点击了停止！！！");
    }

    private void Button1_TouchUpInside(object sender, EventArgs e)
    {
        Console.WriteLine("您点击了播放！！！");
    }
}

}
2.在ViewController中引用自己定义的UIView
using System;
using System.Drawing;
using UIKit;
namespace PoupUIView
{
public partial class MainViewController : UIViewController
{
private MyPopView m_mypopView;

    public MainViewController() : base("MainViewController", null)
    {
    }
    **public MyPopView MypopView
    {
        get
        {
            if (m_mypopView == null)
            {
                m_mypopView = new MyPopView(new RectangleF(0, 0, (float)UIScreen.MainScreen.Bounds.Width, (float)UIScreen.MainScreen.Bounds.Height));
            }
            return m_mypopView;
        }
    }**

    public override void DidReceiveMemoryWarning()
    {
        base.DidReceiveMemoryWarning();
    }

    public override void ViewDidLoad()
    {
        base.ViewDidLoad();
        //设置背景色
        this.View.BackgroundColor = UIColor.Yellow;
        popButton.TouchUpInside += PopButton_TouchUpInside;
    }

    private void PopButton_TouchUpInside(object sender, EventArgs e)
    {
        if (MypopView.Hidden)
        {
            MypopView.Hidden = false;
        }
        else
        {
            //this.View.Window.AddSubview(MypopView);
            //在Button的点击事件中添加自定义view
            this.View.AddSubview(MypopView);
        }
    }
}

}

3.程序运行效果截图如下：

4.设置当点击屏幕的空白区域时让弹窗消失
需要重写
public override void TouchesBegan(NSSet touches, UIEvent evt)
{
//base.TouchesBegan(touches, evt);

        UITouch touch = touches.AnyObject as UITouch;
        //这里设置当触摸小view时，不让弹窗消失！
        if (touch.View == view)
        {
            return;
        }
        // this.Hidden = true;  让当前的大View隐藏
        this.RemoveFromSuperview();//否则就将让大View移除

}