浏览器嵌入，国旗文件

Assets/Scripts/UI/Prefab/Login/LoginRegOptions.cs

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+using Newtonsoft.Json;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using UnityEngine;
+using UnityEngine.EventSystems;
+using UnityEngine.UI;
+
+namespace Assets.Scripts.UI.Prefab.Login
+{
+    public static class DayOptions
+    {
+        private static List<Dropdown.OptionData> SetOptions(int day) 
+        {
+            var op = new Dropdown.OptionDataList();
+            for (int m = 1; m <= day; m++)
+            {
+                op.options.Add(new Dropdown.OptionData(m.ToString()));
+            }
+            return op.options;
+        }
+        public static List<Dropdown.OptionData> dayOption28 = SetOptions(28);
+        public static List<Dropdown.OptionData> dayOption29 = SetOptions(29);
+        public static List<Dropdown.OptionData> dayOption30 = SetOptions(30);
+        public static List<Dropdown.OptionData> dayOption31 = SetOptions(31);
+    }
+    public class CountryModel 
+    {
+        public string country { get;set; }
+        public string abbreviation { get; set; }
+        public string source { get; set; }
+    }
+    public class LoginRegOptions
+    {
+        public List<Dropdown.OptionData> years;
+        public List<Dropdown.OptionData> months;
+        public List<Dropdown.OptionData> days;
+        public List<Dropdown.OptionData> genders;
+        public List<Dropdown.OptionData> countrys;
+        public List<Dropdown.OptionData> units;
+        public int countryDefaultValue;
+        private List<CountryModel> countryList;
+        public LoginRegOptions() 
+        {
+            years = new List<Dropdown.OptionData>();
+            for (int y = 1970; y <= 2021; y++) 
+            {
+                years.Add(new Dropdown.OptionData(y.ToString()));
+            }
+            months = new List<Dropdown.OptionData>();
+            for (int m = 1; m <= 12; m++)
+            {
+                months.Add(new Dropdown.OptionData(m.ToString()));
+            }
+            days = new List<Dropdown.OptionData>();
+            genders = new List<Dropdown.OptionData>() {new Dropdown.OptionData("Male"), new Dropdown.OptionData("FeMale") };
+            var countryJson = Resources.Load<TextAsset>("UI/flags-mini").text;
+            countryList = JsonConvert.DeserializeObject<List<CountryModel>>(countryJson);
+            countrys = countryList.Select(x => new Dropdown.OptionData(x.country)).ToList();
+            countryDefaultValue = countryList.FindIndex(x => x.country == "中国");
+            units = new List<Dropdown.OptionData>() { new Dropdown.OptionData("Metric"), new Dropdown.OptionData("Imperial") };
+        }
+        public Texture GetCountryImage(int index) 
+        {
+            var c = countryList[index];
+            if (c == null) return null;
+            return Resources.Load<Texture>(c.source);
+        }
+        public int GetCountryIndexByCode(string code)
+        {
+            var c = countryList.FindIndex(x => x.abbreviation.ToLower() == code.ToLower());
+            if (c == -1) return countryDefaultValue;
+            return c;
+        }
+        public List<Dropdown.OptionData> GetDayOptions(int year,int month) 
+        {
+            if (new int[] { 1, 3, 5, 7, 8, 10, 12 }.Contains(month))
+            {
+                return DayOptions.dayOption31;
+            }
+            else if (new int[] { 4, 6, 9, 11 }.Contains(month))
+            {
+                return DayOptions.dayOption30;
+            }
+            else if (month == 2)
+            {
+                return DateTime.IsLeapYear(year) ? DayOptions.dayOption29 : DayOptions.dayOption28;
+            }
+            else 
+            {
+                return days;
+            }
+        }
+    }
+}