好吧,所以我一直在四处寻找,我意识到我的问题,但我不知道如何解决它。我制作了一个自定义类来保存一些数据。我为这个类制作对象,我需要它们在会话之间持续存在。在我将所有信息放入 NSUserDefaults
之前,但这不起作用。
-[NSUserDefaults setObject:forKey:]: Attempt to insert non-property value '<Player: 0x3b0cc90>' of class 'Player'.
这是我将自定义类“Player”放入 NSUserDefaults
时收到的错误消息。现在,我读到显然 NSUserDefaults
只存储某些类型的信息。那么我如何将我的对象放入 NSUSerDefaults
中?
我读到应该有一种方法可以“编码”我的自定义对象然后将其放入,但我不确定如何实现它,不胜感激!谢谢!
****编辑****
好的,所以我使用了下面给出的代码(谢谢!),但我仍然遇到一些问题。基本上,代码现在崩溃了,我不知道为什么,因为它没有给出任何错误。也许我错过了一些基本的东西,我太累了,但我们会看到的。这是我的自定义类“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
所以这就是我的课,非常简单,我知道它可以用来制作我的对象。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%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,对不起所有的代码。只是想帮忙。基本上,该应用程序将启动,然后立即崩溃。我已将其范围缩小到应用程序的加密部分,这就是它崩溃的地方,所以我做错了,但我不确定是什么。再次感谢您的帮助,谢谢!
(我还没有开始解密,因为我还没有开始加密工作。)
在您的 Player 类上,实现以下两种方法(将 encodeObject 调用替换为与您自己的对象相关的内容):
- (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;
}
代码厚颜无耻地借自:saving class in nsuserdefaults
Swift 4 引入了 Codable 协议,它为这些类型的任务提供了所有的魔法。只需使您的自定义结构/类符合它:
struct Player: Codable {
let name: String
let life: Double
}
对于存储在默认值中,您可以使用 PropertyListEncoder/Decoder:
let player = Player(name: "Jim", life: 3.14)
UserDefaults.standard.set(try! PropertyListEncoder().encode(player), forKey: kPlayerDefaultsKey)
let storedObject: Data = UserDefaults.standard.object(forKey: kPlayerDefaultsKey) as! Data
let storedPlayer: Player = try! PropertyListDecoder().decode(Player.self, from: storedObject)
它也适用于此类对象的数组和其他容器类:
try! PropertyListDecoder().decode([Player].self, from: storedArray)
Codable
时,您才能免费获得 Codable
行为——否则,您必须自己编写一些编码代码,
Codable
。以此类推,递归。只有在非常自定义的情况下,您才需要编写编码代码。
我创建了一个库 RMMapper (https://github.com/roomorama/RMMapper) 来帮助更轻松、更方便地将自定义对象保存到 NSUserDefaults 中,因为实现 encodeWithCoder 和 initWithCoder 非常无聊!
要将类标记为可归档,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"];
如果有人正在寻找快速版本:
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) 要保存数据,请使用以下功能:
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:这里我保存和检索自定义类对象的数组。
采用@chrissr 的回答并运行它,可以将此代码实现到 NSUserDefaults
上的一个不错的类别中,以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"];
斯威夫特 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
}
init
和 encode
中的变量之前,self
不是必需的。
同步您保存到 NSUserDefaults 中的数据/对象
-(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
不定期副业成功案例分享
NSData *myEncodedObject = [NSKeyedArchiver archivedDataWithRootObject:object];
更改为NSData *encodedObject = [NSKeyedArchiver archivedDataWithRootObject:object];
。变量不匹配。