Xamarin ios 自定义UIView 实现Alert弹窗效果

水深无声 2022-05-29 02:59 305阅读 0赞

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：

![这里写图片描述][Image 1]

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

[Image 1]: