如何在NSUserDefaults中存储自定义对象

好的，所以我一直在做些什么，我意识到我的问题，但我不知道如何解决这个问题。 我已经做了一个自定义的类来保存一些数据。 我为这个class级制作对象，我需要让他们在两节课之间持续。 在我把所有的信息放在NSUserDefaults ，但是这不起作用。

 -[NSUserDefaults setObject:forKey:]: Attempt to insert non-property value '<Player: 0x3b0cc90>' of class 'Player'. 

这是我在NSUserDefaults放入自定义类“Player”时得到的错误消息。 现在，我已经读了，显然NSUserDefaults只存储一些types的信息。 那么如何让我的对象进入NSUSerDefaults ？

我读到应该有一种方法来“编码”我的自定义对象，然后把它，但我不知道如何实现它，帮助将不胜感激！ 谢谢！

****编辑****

好吧，所以我使用下面给出的代码（谢谢！），但我仍然有一些问题。 基本上，代码现在崩溃，我不知道为什么，因为它不会给出任何错误。 也许我错过了一些基本的东西，我太累了，但我们会看到。 这里是我的自定义类“播放器”的实现：

 @interface Player : NSObject { NSString *name; NSNumber *life; //Log of player's life } //Getting functions, return the info - (NSString *)name; - (int)life; - (id)init; //These are the setters - (void)setName:(NSString *)input; //string - (void)setLife:(NSNumber *)input; //number @end 

实施文件：

 #import "Player.h" @implementation Player - (id)init { if (self = [super init]) { [self setName:@"Player Name"]; [self setLife:[NSNumber numberWithInt:20]]; [self setPsnCounters:[NSNumber numberWithInt:0]]; } return self; } - (NSString *)name {return name;} - (int)life {return [life intValue];} - (void)setName:(NSString *)input { [input retain]; if (name != nil) { [name release]; } name = input; } - (void)setLife:(NSNumber *)input { [input retain]; if (life != nil) { [life release]; } life = input; } /* This code has been added to support encoding and decoding my objecst */ -(void)encodeWithCoder:(NSCoder *)encoder { //Encode the properties of the object [encoder encodeObject:self.name forKey:@"name"]; [encoder encodeObject:self.life forKey:@"life"]; } -(id)initWithCoder:(NSCoder *)decoder { self = [super init]; if ( self != nil ) { //decode the properties self.name = [decoder decodeObjectForKey:@"name"]; self.life = [decoder decodeObjectForKey:@"life"]; } return self; } -(void)dealloc { [name release]; [life release]; [super dealloc]; } @end 

所以这是我的课，非常简单，我知道它在制作我的对象。 所以这里是AppDelegate文件的相关部分（我称之为encryption和解密函数）：

 @class MainViewController; @interface MagicApp201AppDelegate : NSObject <UIApplicationDelegate> { UIWindow *window; MainViewController *mainViewController; } @property (nonatomic, retain) IBOutlet UIWindow *window; @property (nonatomic, retain) MainViewController *mainViewController; -(void)saveCustomObject:(Player *)obj; -(Player *)loadCustomObjectWithKey:(NSString*)key; @end 

然后执行文件的重要部分：

  #import "MagicApp201AppDelegate.h" #import "MainViewController.h" #import "Player.h" @implementation MagicApp201AppDelegate @synthesize window; @synthesize mainViewController; - (void)applicationDidFinishLaunching:(UIApplication *)application { NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults]; //First check to see if some things exist int startup = [prefs integerForKey:@"appHasLaunched"]; if (startup == nil) { //Make the single player Player *singlePlayer = [[Player alloc] init]; NSLog([[NSString alloc] initWithFormat:@"%@\n%d\n%d",[singlePlayer name], [singlePlayer life], [singlePlayer psnCounters]]); // test //Encode the single player so it can be stored in UserDefaults id test = [MagicApp201AppDelegate new]; [test saveCustomObject:singlePlayer]; [test release]; } [prefs synchronize]; } -(void)saveCustomObject:(Player *)object { NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults]; NSData *myEncodedObject = [NSKeyedArchiver archivedDataWithRootObject:object]; [prefs setObject:myEncodedObject forKey:@"testing"]; } -(Player *)loadCustomObjectWithKey:(NSString*)key { NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults]; NSData *myEncodedObject = [prefs objectForKey:key ]; Player *obj = (Player *)[NSKeyedUnarchiver unarchiveObjectWithData: myEncodedObject]; return obj; } 

Eeee，对所有的代码抱歉。 只是想帮助。 基本上，应用程序将启动，然后立即崩溃。 我已经缩小到应用程序的encryption部分，这是它崩溃的地方，所以我做错了，但我不知道是什么。 帮助将不胜感激，谢谢！

（我还没有得到解密，因为我还没有得到encryption工作。）

Answer 1

在您的Player类中，实现以下两种方法（用与您自己的对象相关的东西来代替对encodeObject的调用）：

 - (void)encodeWithCoder:(NSCoder *)encoder { //Encode properties, other class variables, etc [encoder encodeObject:self.question forKey:@"question"]; [encoder encodeObject:self.categoryName forKey:@"category"]; [encoder encodeObject:self.subCategoryName forKey:@"subcategory"]; } - (id)initWithCoder:(NSCoder *)decoder { if((self = [super init])) { //decode properties, other class vars self.question = [decoder decodeObjectForKey:@"question"]; self.categoryName = [decoder decodeObjectForKey:@"category"]; self.subCategoryName = [decoder decodeObjectForKey:@"subcategory"]; } return self; } 

从NSUserDefaults读取和写入：

 - (void)saveCustomObject:(MyObject *)object key:(NSString *)key { NSData *encodedObject = [NSKeyedArchiver archivedDataWithRootObject:object]; NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; [defaults setObject:encodedObject forKey:key]; [defaults synchronize]; } - (MyObject *)loadCustomObjectWithKey:(NSString *)key { NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; NSData *encodedObject = [defaults objectForKey:key]; MyObject *object = [NSKeyedUnarchiver unarchiveObjectWithData:encodedObject]; return object; } 

代码无耻借用： nsuserdefaults中的保存类

Answer 2

我创build了一个库RMmapper（ https://github.com/roomorama/RMMapper ），以帮助保存自定义对象到NSUserDefaults更简单，更方便，因为执行encodeWithCoder和initWithCoder是超级无聊！

为了将类标记为可存档，只需使用： #import "NSObject+RMArchivable.h"

将自定义对象保存到NSUserDefaults中：

 #import "NSUserDefaults+RMSaveCustomObject.h" NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults]; [defaults rm_setCustomObject:user forKey:@"SAVED_DATA"]; 

从NSUserDefaults获取自定义obj：

 user = [defaults rm_customObjectForKey:@"SAVED_DATA"]; 

Answer 3

如果有人正在寻找一个迅速的版本：

1）为您的数据创build一个自定义类

 class customData: NSObject, NSCoding { let name : String let url : String let desc : String init(tuple : (String,String,String)){ self.name = tuple.0 self.url = tuple.1 self.desc = tuple.2 } func getName() -> String { return name } func getURL() -> String{ return url } func getDescription() -> String { return desc } func getTuple() -> (String,String,String) { return (self.name,self.url,self.desc) } required init(coder aDecoder: NSCoder) { self.name = aDecoder.decodeObjectForKey("name") as! String self.url = aDecoder.decodeObjectForKey("url") as! String self.desc = aDecoder.decodeObjectForKey("desc") as! String } func encodeWithCoder(aCoder: NSCoder) { aCoder.encodeObject(self.name, forKey: "name") aCoder.encodeObject(self.url, forKey: "url") aCoder.encodeObject(self.desc, forKey: "desc") } } 

2）保存数据使用以下function：

 func saveData() { let data = NSKeyedArchiver.archivedDataWithRootObject(custom) let defaults = NSUserDefaults.standardUserDefaults() defaults.setObject(data, forKey:"customArray" ) } 

3）检索：

 if let data = NSUserDefaults.standardUserDefaults().objectForKey("customArray") as? NSData { custom = NSKeyedUnarchiver.unarchiveObjectWithData(data) as! [customData] } 

注意：这里我保存并检索一个自定义类对象的数组。

Answer 4

拿@ chrissr的答案来说，这个代码可以在NSUserDefaults上实现一个很好的类别来保存和检索自定义对象：

 @interface NSUserDefaults (NSUserDefaultsExtensions) - (void)saveCustomObject:(id<NSCoding>)object key:(NSString *)key; - (id<NSCoding>)loadCustomObjectWithKey:(NSString *)key; @end @implementation NSUserDefaults (NSUserDefaultsExtensions) - (void)saveCustomObject:(id<NSCoding>)object key:(NSString *)key { NSData *encodedObject = [NSKeyedArchiver archivedDataWithRootObject:object]; [self setObject:encodedObject forKey:key]; [self synchronize]; } - (id<NSCoding>)loadCustomObjectWithKey:(NSString *)key { NSData *encodedObject = [self objectForKey:key]; id<NSCoding> object = [NSKeyedUnarchiver unarchiveObjectWithData:encodedObject]; return object; } @end 

用法：

 [[NSUserDefaults standardUserDefaults] saveCustomObject:myObject key:@"myKey"]; 

Answer 5

将您保存的数据/对象同步到NSUserDefaults中

 -(void)saveCustomObject:(Player *)object { NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults]; NSData *myEncodedObject = [NSKeyedArchiver archivedDataWithRootObject:object]; [prefs setObject:myEncodedObject forKey:@"testing"]; [prefs synchronize]; } 

希望这会帮助你。 谢谢

Answer 6

Swift 3

 class MyObject: NSObject, NSCoding { let name : String let url : String let desc : String init(tuple : (String,String,String)){ self.name = tuple.0 self.url = tuple.1 self.desc = tuple.2 } func getName() -> String { return name } func getURL() -> String{ return url } func getDescription() -> String { return desc } func getTuple() -> (String, String, String) { return (self.name,self.url,self.desc) } required init(coder aDecoder: NSCoder) { self.name = aDecoder.decodeObject(forKey: "name") as? String ?? "" self.url = aDecoder.decodeObject(forKey: "url") as? String ?? "" self.desc = aDecoder.decodeObject(forKey: "desc") as? String ?? "" } func encode(with aCoder: NSCoder) { aCoder.encode(self.name, forKey: "name") aCoder.encode(self.url, forKey: "url") aCoder.encode(self.desc, forKey: "desc") } } 

存储和检索：

 func save() { let data = NSKeyedArchiver.archivedData(withRootObject: object) UserDefaults.standard.set(data, forKey:"customData" ) } func get() -> MyObject? { guard let data = UserDefaults.standard.object(forKey: "customData") as? Data else { return nil } return NSKeyedUnarchiver.unarchiveObject(with: data) as? MyObject }