20200706

wxr

2020-07-06 23c075a9c27946773feccf05abc90489a6bf5203

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using System;
using UIKit;
using CoreGraphics;
 
namespace Shared
{
    /// <summary>
    /// 对话框
    /// </summary>
    public class Alert
    {
        /// <summary>
        /// 当前对话框
        /// </summary>
        UIAlertView myUIAlertView;
 
        /// <summary>
        /// 对话窗
        /// </summary>
        /// <param name="title">标题</param>
        /// <param name="message">信息</param>
        /// <param name="cancelButtonText">取消按键备注，值null表示不显示取消按键</param>
        /// <param name="okButtonText">确认按键备注</param>
        public Alert(string title, string message, string cancelButtonText, string okButtonText)
        {
            myUIAlertView = new UIAlertView { Title = title, Message = message };
            myUIAlertView.Clicked += (s, e) =>
            {
                if (ResultEventHandler != null)
                {
                    if (e.ButtonIndex == 0)
                    {
                        if (flag)
                        {
                            //取消按键
                            ResultEventHandler?.Invoke(this, false);
                        }
                        else
                        {
                            //按了确定
                            ResultEventHandler?.Invoke(this, true);
                        }
                    }
                    else if (e.ButtonIndex == 1)
                    {
                        //按了确定
                        ResultEventHandler?.Invoke(this, true);
                    }
                }
 
            };
            if (cancelButtonText != null)
            {
                myUIAlertView.AddButton(cancelButtonText);
                flag = true;
            }
            myUIAlertView.AddButton(okButtonText);
        }
 
 
        bool flag;
        /// <summary>
        /// 对话窗
        /// </summary>
        /// <param name="title">标题</param>
        /// <param name="message">信息</param>
        /// <param name="okButtonText">确认按键备注</param>
        public Alert(string title,string message,string okButtonText):this(title,message,null,okButtonText)
        {
            
        }
 
        /// <summary>
        /// 结果通知事件，true表示选中按键，false表示取消事件
        /// </summary>
        public Action<Alert, bool> ResultEventHandler;
    
        /// <summary>
        /// 显示当前的界面
        /// </summary>
        public void Show()
        {
            myUIAlertView.Show();
 
            //if (myUIAlertView != null && !myUIAlertView.Visible)
            //{
            //    myUIAlertView.Show();
            //}
        }
 
 
 
        /// <summary>
        /// 关闭当前的界面
        /// </summary>
        public void Dismiss()
        {
            if (myUIAlertView != null )
            {
                myUIAlertView.DismissWithClickedButtonIndex(0, false);
            }
 
        }
 
    }
}