如何在NSUserDefaults中存储自定义对象
好的,所以我一直在做点什么,我意识到我的问题,但我不知道如何解决它。 我已经做了一个自定义类来保存一些数据。 我为这个班级制作对象,我需要让他们在两节课之间持续。 在我将所有信息放入NSUserDefaults
,但这不起作用。
-[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,我已经读过,显然NSUserDefaults
只存储一些类型的信息。 那么如何让我的对象进入NSUSerDefaults
?
我读过,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****
好的,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。 以下是我的Custom类“Player”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,很简单,我知道它在制作我的对象时很有用。 所以这里是AppDelegate文件的相关部分(我称之为加密和解密函数):
@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
然后是实现文件的重要部分:
#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%dn%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,对所有的代码感到抱歉。 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加密部分,这是它崩溃的地方,所以我做错了什么,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,因为我还没有加密工作。)
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内容替代对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中的保存课程
我创建了一个库RMmapper(https://github.com/roomorama/RMMapper),以帮助将自定义对象保存到NSUserDefaults中更简单更方便,因为实现encodeWithCoder和initWithCoder是非常无聊的!
要将类标记为可存档,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中获取自定义obj:
user = [defaults rm_customObjectForKey:@"SAVED_DATA"];
如果有人正在寻找一个快速版本:
1)为您的数据创建一个自定义类
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)保存数据使用以下功能:
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:这里我保存并检索自定义类对象的数组。
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