MonoGame在iOS上缺少数据存储IsolatedStorageSettings类的解决办法
MonoGame的价值在于可以将原XNA游戏移植到iOS和Android平台。移植基础是Xamarin。在Xamarin.iOS缺少System.IO.IsolatedStorage.IsolatedStorageSettings类。这个类通常用来存储游戏数据状态，非常重要。下面提供IsolatedStorageSettings在iOS平台的实现代码：
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using System; using System.Collections; using System.Collections.Generic; using System.IO; using System.Runtime.Serialization; using System.Text; namespace System.IO.IsolatedStorage { public sealed class IsolatedStorageSettings : IDictionary<string, object>, IDictionary, ICollection<KeyValuePair<string, object>>, ICollection, IEnumerable<KeyValuePair<string, object>>, IEnumerable { static private IsolatedStorageSettings application_settings; static private IsolatedStorageSettings site_settings; private IsolatedStorageFile container; private Dictionary<string, object> settings; // SL2 use a "well known" name and it's readable (and delete-able) directly by isolated storage private const string LocalSettings = "__LocalSettings"; internal IsolatedStorageSettings (IsolatedStorageFile isf) { container = isf; if (!isf.FileExists (LocalSettings)) { settings = new Dictionary<string, object> (); return; } using (IsolatedStorageFileStream fs = isf.OpenFile (LocalSettings, FileMode.Open)) { using (StreamReader sr = new StreamReader (fs)) { DataContractSerializer reader = new DataContractSerializer (typeof (Dictionary<string, object>)); try { settings = (Dictionary<string, object>) reader.ReadObject (fs); } catch (Xml.XmlException) { settings = new Dictionary<string, object> (); } } } } ~IsolatedStorageSettings () { // settings are automatically saved if the application close normally Save (); } // static properties // per application, per-computer, per-user public static IsolatedStorageSettings ApplicationSettings { get { if (application_settings == null) { application_settings = new IsolatedStorageSettings ( IsolatedStorageFile.GetUserStoreForApplication ()); } return application_settings; } } // per domain, per-computer, per-user public static IsolatedStorageSettings SiteSettings { get { if (site_settings == null) { site_settings = new IsolatedStorageSettings ( IsolatedStorageFile.GetUserStoreForSite ()); } return site_settings; } } // properties public int Count { get { return settings.Count; } } public ICollection Keys { get { return settings.Keys; } } public ICollection Values { get { return settings.Values; } } public object this [string key] { get { return settings [key]; } set { settings [key] = value; } } // methods public void Add (string key, object value) { settings.Add (key, value); } // This method is emitted as virtual due to: https://bugzilla.novell.com/show_bug.cgi?id=446507 public void Clear () { settings.Clear (); } public bool Contains (string key) { if (key == null) throw new ArgumentNullException ("key"); return settings.ContainsKey (key); } public bool Remove (string key) { return settings.Remove (key); } public void Save () { using (IsolatedStorageFileStream fs = container.CreateFile (LocalSettings)) { DataContractSerializer ser = new DataContractSerializer (settings.GetType ()); ser.WriteObject (fs, settings); } } public bool TryGetValue<T> (string key, out T value) { object v; if (!settings.TryGetValue (key, out v)) { value = default (T); return false; } value = (T) v; return true; } // explicit interface implementations int ICollection<KeyValuePair<string, object>>.Count { get { return settings.Count; } } bool ICollection<KeyValuePair<string, object>>.IsReadOnly { get { return false; } } void ICollection<KeyValuePair<string, object>>.Add (KeyValuePair<string, object> item) { settings.Add (item.Key, item.Value); } void ICollection<KeyValuePair<string, object>>.Clear () { settings.Clear (); } bool ICollection<KeyValuePair<string, object>>.Contains (KeyValuePair<string, object> item) { return settings.ContainsKey (item.Key); } void ICollection<KeyValuePair<string, object>>.CopyTo (KeyValuePair<string, object> [] array, int arrayIndex) { (settings as ICollection<KeyValuePair<string, object>>).CopyTo (array, arrayIndex); } bool ICollection<KeyValuePair<string, object>>.Remove (KeyValuePair<string, object> item) { return settings.Remove (item.Key); } ICollection<string> IDictionary<string, object>.Keys { get { return settings.Keys; } } ICollection<object> IDictionary<string, object>.Values { get { return settings.Values; } } bool IDictionary<string, object>.ContainsKey (string key) { return settings.ContainsKey (key); } bool IDictionary<string, object>.TryGetValue (string key, out object value) { return settings.TryGetValue (key, out value); } private string ExtractKey (object key) { if (key == null) throw new ArgumentNullException ("key"); return (key as string); } void IDictionary.Add (object key, object value) { string s = ExtractKey (key); if (s == null) throw new ArgumentException ("key"); settings.Add (s, value); } void IDictionary.Clear () { settings.Clear (); } bool IDictionary.Contains (object key) { string skey = ExtractKey (key); if (skey == null) return false; return settings.ContainsKey (skey); } object IDictionary.this [object key] { get { string s = ExtractKey (key); return (s == null) ? null : settings [s]; } set { string s = ExtractKey (key); if (s == null) throw new ArgumentException ("key"); settings [s] = value; } } bool IDictionary.IsFixedSize { get { return false; } } bool IDictionary.IsReadOnly { get { return false; } } void IDictionary.Remove (object key) { string s = ExtractKey (key); if (s != null) settings.Remove (s); } void ICollection.CopyTo (Array array, int index) { (settings as ICollection).CopyTo (array, index); } bool ICollection.IsSynchronized { get { return (settings as ICollection).IsSynchronized; } } object ICollection.SyncRoot { get { return (settings as ICollection).SyncRoot; } } IEnumerator<KeyValuePair<string, object>> IEnumerable<KeyValuePair<string, object>>.GetEnumerator () { return settings.GetEnumerator (); } IEnumerator IEnumerable.GetEnumerator () { return settings.GetEnumerator (); } IDictionaryEnumerator IDictionary.GetEnumerator () { return settings.GetEnumerator (); } } } |
还需要引用System.Runtime.Serialization.dll
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