I apologize for duplicate Question . I am new in ios . I want to store custom objects in userdefaults. I am using objective-c .
Thanks in advance
First you create custom class Like below.
CustomObject.h
#import <Foundation/Foundation.h>
#interface CustomObject : NSObject<NSCoding>
#property(strong,nonatomic)NSString *name;
#end
CustomObject.m
#import "CustomObject.h"
#implementation CustomObject
- (void)encodeWithCoder:(NSCoder *)encoder {
//Encode properties, other class variables, etc
[encoder encodeObject:self.name forKey:#"name"];
}
- (id)initWithCoder:(NSCoder *)decoder {
if((self = [super init])) {
//decode properties, other class vars
self.name = [decoder decodeObjectForKey:#"name"];
}
return self;
}
Then create CustomObject class object and store in NSUserDefaults
Stored your object like this
CustomObject *object =[CustomObject new];
object.name = #"test";
NSMutableArray *arr = [[NSMutableArray alloc]init];
[arr addObject:object];
NSData *encodedObject = [NSKeyedArchiver archivedDataWithRootObject:arr];
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:encodedObject forKey:#"storeObject"];
[defaults synchronize];
get custom object from NSUserDefaults like this
NSData *storedEncodedObject = [defaults objectForKey:#"storeObject"];
NSArray *arrStoreObject = [NSKeyedUnarchiver unarchiveObjectWithData:storedEncodedObject];
for (int i=0; i<arrStoreObject.count; i++)
{
CustomObject *storedObject = [arrStoreObject objectAtIndex:i];
NSLog(#"%#",storedObject.name);
}
In Swift 3
// set a value for key
let encodedData = NSKeyedArchiver.archivedData(withRootObject: #YOUR OBJECT#)
UserDefaults.standard.set(encodedData, forKey: #YOUR KEY#)
// retrieving a value for a key
if let data = UserDefaults.standard.data(forKey: #YOUR KEY#),
let obj = NSKeyedUnarchiver.unarchiveObject(with: data) as? #YOUR OBJECT# {
} else {
print("There is an issue")
}
Related
Alright, so I've been doing some poking around, and I realize my problem, but I don't know how to fix it. I have made a custom class to hold some data. I make objects for this class, and I need to them to last between sessions. Before I was putting all my information in NSUserDefaults, but this isn't working.
-[NSUserDefaults setObject:forKey:]: Attempt to insert non-property value '<Player: 0x3b0cc90>' of class 'Player'.
That is the error message I get when I put my custom class, "Player", in the NSUserDefaults. Now, I've read up that apparently NSUserDefaults only stores some types of information. So how an I get my objects into NSUSerDefaults?
I read that there should be a way to to "encode" my custom object and then put it in, but I'm not sure how to implement it, help would be appreciated! Thank you!
****EDIT****
Alright, so I worked with the code given below (Thank you!), but I'm still having some issues. Basically, the code crashes now and I'm not sure why, because it doesn't give any errors. Perhaps I'm missing something basic and I'm just too tired, but we'll see. Here is the implementation of my Custom class, "Player":
#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
Implementation File:
#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
So that's my class, pretty straight forward, I know it works in making my objects. So here is the relevant parts of the AppDelegate file (where I call the encryption and decrypt functions):
#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
And then the important parts of the implementation file:
#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, sorry about all the code. Just trying to help. Basically, the app will launch and then crash immediatly. I've narrowed it down to the encryption part of the app, that's where it crashes, so I'm doing something wrong but I'm not sure what. Help would be appreciated again, thank you!
(I haven't gotten around to decrypting yet, as I haven't gotten encrypting working yet.)
On your Player class, implement the following two methods (substituting calls to encodeObject with something relevant to your own object):
- (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;
}
Reading and writing from NSUserDefaults:
- (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;
}
Code shamelessly borrowed from: saving class in nsuserdefaults
Swift 4 introduced the Codable protocol which does all the magic for these kinds of tasks. Just conform your custom struct/class to it:
struct Player: Codable {
let name: String
let life: Double
}
And for storing in the Defaults you can use the 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)
It will work like that for arrays and other container classes of such objects too:
try! PropertyListDecoder().decode([Player].self, from: storedArray)
I create a library RMMapper (https://github.com/roomorama/RMMapper) to help save custom object into NSUserDefaults easier and more convenient, because implementing encodeWithCoder and initWithCoder is super boring!
To mark a class as archivable, just use: #import "NSObject+RMArchivable.h"
To save a custom object into NSUserDefaults:
#import "NSUserDefaults+RMSaveCustomObject.h"
NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
[defaults rm_setCustomObject:user forKey:#"SAVED_DATA"];
To get custom obj from NSUserDefaults:
user = [defaults rm_customObjectForKey:#"SAVED_DATA"];
If anybody is looking for a swift version:
1) Create a custom class for your data
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) To save data use following function:
func saveData()
{
let data = NSKeyedArchiver.archivedDataWithRootObject(custom)
let defaults = NSUserDefaults.standardUserDefaults()
defaults.setObject(data, forKey:"customArray" )
}
3) To retrieve:
if let data = NSUserDefaults.standardUserDefaults().objectForKey("customArray") as? NSData
{
custom = NSKeyedUnarchiver.unarchiveObjectWithData(data) as! [customData]
}
Note: Here I am saving and retrieving an array of the custom class objects.
Taking #chrissr's answer and running with it, this code can be implemented into a nice category on NSUserDefaults to save and retrieve custom objects:
#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
Usage:
[[NSUserDefaults standardUserDefaults] saveCustomObject:myObject key:#"myKey"];
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")
}
}
to store and retrieve:
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
}
Synchronize the data/object that you have saved into NSUserDefaults
-(void)saveCustomObject:(Player *)object
{
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
NSData *myEncodedObject = [NSKeyedArchiver archivedDataWithRootObject:object];
[prefs setObject:myEncodedObject forKey:#"testing"];
[prefs synchronize];
}
Hope this will help you. Thanks
In My Modal Object two values are there
I'm trying to store in NSUserDefaults. This is My Code
interface File:
#interface collectionModel : NSObject <NSCoding> {
}
#property(nonatomic,retain) NSString *name;
#property(nonatomic,retain) NSString *author;
Implementation File:
#implementation collectionModel
#synthesize name = _name;
#synthesize author = _author;
- (id)initWithCoder:(NSCoder *)aDecoder {
if (self = [super init]) {
self.name = [aDecoder decodeObjectForKey:#"name"];
self.author = [aDecoder decodeObjectForKey:#"author"];
}
return self;
}
- (void)encodeWithCoder:(NSCoder *)aCoder {
[aCoder encodeObject:_name forKey:#"name"];
[aCoder encodeObject:_author forKey:#"author"];
}
ViewController.M
#import "collectionModel.h"
parsedCollectionArr = [[NSMutableArray alloc] init];
for (NSDictionary *obj in collectionBalk) {
NSString * Name = [obj objectForKey:#"Name"];
NSString * author = [obj objectForKey:#"author"];
collectionModel *dataObj = [[collectionModel alloc] init];
dataObj.name = Name;
dataObj.author = author;
[parsedCollectionArr addObject:dataObj];
}
NSLog(#"parsedCollectionArr count ---->>>> %d",23);
Here I want to store this parsedCollectionArr in NSUserDefaults and retrive from it.can any one help me.
try this..
Create a class like "CollectionModelManager.h and .m"
//For Save CollectionModel
+ (void)saveCollectionModel:(CollectionModel *) collectionModel
{
NSData *encodedData = [NSKeyedArchiver archivedDataWithRootObject:collectionModel];
NSUserDefaults *userDef = [NSUserDefaults standardUserDefaults];
[userDef setObject:encodedData forKey:kCollectionModelKey]; //here kCollectionModelKey is a static string
[userDef synchronize];
}
//For Get CollectionModel
+ (CollectionModel *)getCollectionModel
{
NSUserDefaults *userDef = [NSUserDefaults standardUserDefaults];
CollectionModel *collectionModel = nil;
NSData *encodedData = [userDef objectForKey:kCollectionModelKey]; //Same static string use here kCollectionModelKey
if (encodedData != nil) {
collectionModel = [NSKeyedUnarchiver unarchiveObjectWithData:encodedData];
}
return collectionModel;
}
I have a class called "EntityType" that has a string "name" and I am using NSUserDefaults to save it so I tried this:
if (button.selected)
{
[button setSelected:YES];
[[NSUserDefaults standardUserDefaults]setObject:[NSNumber numberWithBool:YES] forKey:#"buttonSelected"];
}
I want to access the variable from another class and save it inside NSUserDefaults
You have missed sync call.Apply this to save it.
if (button.selected)
{
[button setSelected:YES];
[[NSUserDefaults standardUserDefaults]setObject:[NSNumber numberWithBool:YES] forKey:#"buttonSelected"];
[[NSUserDefaults standardUserDefaults] synchronize];
}
to get it back later
NSNumber* savedValue = [[NSUserDefaults standardUserDefaults]
objectForKey:#"buttonSelected"];
This is if you want to store only the value.
If you want to store your custom object look at this link
How to store custom objects in NSUserDefaults
You can get NSNumber object like,
NSNumber *num = [[NSUserDefaults standardUserDefaults] objectForKey:#"buttonSelected"];
from anywhere in the app.
On your EntityType class, implement the following two methods for encoding and decoding (something relevant to your own object):
- (void)encodeWithCoder:(NSCoder *)encoder {
//Encode properties, other class variables, etc
[encoder encodeObject:self.name forKey:#"name"];
}
- (id)initWithCoder:(NSCoder *)decoder {
if((self = [super init])) {
//decode properties, other class vars
self.name = [decoder decodeObjectForKey:#"name"];
}
return self;
}
Reading and writing from NSUserDefaults:
- (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;
}
Code borrowed from: save class in NSUserDefaults
**ViewController.h**
#import <UIKit/UIKit.h>
#interface ViewController : UIViewController
//here i took one userdefault property
#property(strong,nonatomic)NSUserDefaults *user;
#end
**ViewController.m**
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
//after the property declaration take standard user defaults
_user = [NSUserDefaults standardUserDefaults];
//here i took Bool and key you can take any thing but took my_val
[_user setBool:YES forKey:#"my_val"];
}
// this is button action
- (IBAction)submit:(id)sender
{
//for bool i am checking the condition given above
if ([_user boolForKey:#"my_val"])
{
**enter code here**
NSLog(#"values is set to yes");
}
else
{
**enter code here**
NSLog(#"Value is set to No");
}
}
currently, I try make an music playlist application. I try to save and retrieve playlist data from NSUserDefaults. I have no problem when saving the data but I got an error when retrieving data.
I got:
Terminating app due to uncaught exception 'MPMediaItemCollectionInitException', reason: '-init is not supported, use -initWithItems:
I'm following the answer from Play iPod playlist retrieved from a saved persistentid list but I try to write it in swift.
here is my save function:
func savePlaylist(var mediaItemCollection: MPMediaItemCollection){
var items: NSArray = mediaItemCollection.items
var listToSave: NSMutableArray = NSMutableArray()
for song in items{
var persistentId: AnyObject! = song.valueForProperty(MPMediaItemPropertyPersistentID)
listToSave.addObject(persistentId)
}
var data: NSData = NSKeyedArchiver.archivedDataWithRootObject(listToSave)
NSUserDefaults.standardUserDefaults().setObject(data, forKey: "songsList")
NSUserDefaults.standardUserDefaults().synchronize()
}
and here is my retrieve function:
func setupMusic(){
if NSUserDefaults.standardUserDefaults().objectForKey("songsList") != nil{
var theList: NSMutableArray = NSMutableArray()
var data: NSData = (NSUserDefaults.standardUserDefaults().objectForKey("songsList") as? NSData)!
var decodedData: NSArray = (NSKeyedUnarchiver.unarchiveObjectWithData(data) as? NSArray)!
theList.addObjectsFromArray(decodedData as [AnyObject])
var allTheSongs: NSMutableArray = NSMutableArray()
for var i = 0; i < theList.count; i++ {
var songQuery = MPMediaQuery.songsQuery()
var songs: NSArray = songQuery.items
allTheSongs.addObject(songs)
}
var currentQueue: MPMediaItemCollection = MPMediaItemCollection()
myMusicPlayer?.setQueueWithItemCollection(currentQueue)
}else{
println("fail!!!!!!!!!!!!")
}
}
How can I fix it?
Here is the issue var currentQueue: MPMediaItemCollection = MPMediaItemCollection()
You must init with items
As per the documentation by apple.
init(items:)
Designated Initializer
Initializes a media item collection with an array of media items.
Declaration
Swift
init!(items items: [AnyObject]!)
Parameters
items
The array of items you are assigning to the media item collection.
You have to init with items like
var currentQueue: MPMediaItemCollection = MPMediaItemCollection(items:itemsArray)
I am giving you a very simple way to any kind of object and retrieve from NSUserDefault .
You don't need to use explicitly archive and unarchive .
Just create a category of NSUserDefaults as follow
#import <Foundation/Foundation.h>
#interface NSUserDefaults (AKSNSUserDefaults)
- (void)saveCustomObject:(id<NSCoding>)object
key:(NSString *)key;
- (id<NSCoding>)loadCustomObjectWithKey:(NSString *)key;
#end
#implementation NSUserDefaults (AKSNSUserDefaults)
- (void)saveCustomObject:(id<NSCoding>)object
key:(NSString *)key {
NSData *encodedObject = [NSKeyedArchiver archivedDataWithRootObject:object];
[self setObject:encodedObject forKey:key];
[self synchronize];
}
- (id)loadCustomObjectWithKey:(NSString *)key {
NSData *encodedObject = [self objectForKey:key];
id object = [NSKeyedUnarchiver unarchiveObjectWithData:encodedObject];
return object;
}
#end
and than your NSUserDefaults is ready to store any object . but one thing is need to use NSCoder in your object model .
for example :
#import <Foundation/Foundation.h>
#interface AKSClassA : NSObject<NSCoding>
// declared some property
#property (nonatomic,assign) NSInteger userID;
#property (nonatomic,strong) NSString *userName;
#end
#import "AKSClassA.h"
#implementation AKSClassA
#synthesize userID;
#synthesize userName;
-(id)initWithCoder:(NSCoder *)aDecoder{
if (self = [super init]) {
self. userID = [aDecoder decodeIntegerForKey:#"userID"];
self. userName = [aDecoder decodeObjectForKey:#"userName"];
}
return self;
}
-(void)encodeWithCoder:(NSCoder *)aCoder{
[aCoder encodeInteger:userID forKey:#"userID"];
[aCoder encodeObject:userName forKey:#"userName"];
}
#end
// in some class if you are using classA object member to store and retrieve with value example below
// to save data in NSUserDefaults
AKSClassA *obj =[array1 objectAtIndex:index];
[[NSUserDefaults standardUserDefaults] saveCustomObject:button key:#"userData"];
// to retrieve data
AKSClassA *obj1 = (AKSClassA*)[[NSUserDefaults standardUserDefaults]loadCustomObjectWithKey:#"userData"];
[titleLabel setText:obj1.userName];
Alright, so I've been doing some poking around, and I realize my problem, but I don't know how to fix it. I have made a custom class to hold some data. I make objects for this class, and I need to them to last between sessions. Before I was putting all my information in NSUserDefaults, but this isn't working.
-[NSUserDefaults setObject:forKey:]: Attempt to insert non-property value '<Player: 0x3b0cc90>' of class 'Player'.
That is the error message I get when I put my custom class, "Player", in the NSUserDefaults. Now, I've read up that apparently NSUserDefaults only stores some types of information. So how an I get my objects into NSUSerDefaults?
I read that there should be a way to to "encode" my custom object and then put it in, but I'm not sure how to implement it, help would be appreciated! Thank you!
****EDIT****
Alright, so I worked with the code given below (Thank you!), but I'm still having some issues. Basically, the code crashes now and I'm not sure why, because it doesn't give any errors. Perhaps I'm missing something basic and I'm just too tired, but we'll see. Here is the implementation of my Custom class, "Player":
#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
Implementation File:
#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
So that's my class, pretty straight forward, I know it works in making my objects. So here is the relevant parts of the AppDelegate file (where I call the encryption and decrypt functions):
#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
And then the important parts of the implementation file:
#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, sorry about all the code. Just trying to help. Basically, the app will launch and then crash immediatly. I've narrowed it down to the encryption part of the app, that's where it crashes, so I'm doing something wrong but I'm not sure what. Help would be appreciated again, thank you!
(I haven't gotten around to decrypting yet, as I haven't gotten encrypting working yet.)
On your Player class, implement the following two methods (substituting calls to encodeObject with something relevant to your own object):
- (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;
}
Reading and writing from NSUserDefaults:
- (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;
}
Code shamelessly borrowed from: saving class in nsuserdefaults
Swift 4 introduced the Codable protocol which does all the magic for these kinds of tasks. Just conform your custom struct/class to it:
struct Player: Codable {
let name: String
let life: Double
}
And for storing in the Defaults you can use the 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)
It will work like that for arrays and other container classes of such objects too:
try! PropertyListDecoder().decode([Player].self, from: storedArray)
I create a library RMMapper (https://github.com/roomorama/RMMapper) to help save custom object into NSUserDefaults easier and more convenient, because implementing encodeWithCoder and initWithCoder is super boring!
To mark a class as archivable, just use: #import "NSObject+RMArchivable.h"
To save a custom object into NSUserDefaults:
#import "NSUserDefaults+RMSaveCustomObject.h"
NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
[defaults rm_setCustomObject:user forKey:#"SAVED_DATA"];
To get custom obj from NSUserDefaults:
user = [defaults rm_customObjectForKey:#"SAVED_DATA"];
If anybody is looking for a swift version:
1) Create a custom class for your data
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) To save data use following function:
func saveData()
{
let data = NSKeyedArchiver.archivedDataWithRootObject(custom)
let defaults = NSUserDefaults.standardUserDefaults()
defaults.setObject(data, forKey:"customArray" )
}
3) To retrieve:
if let data = NSUserDefaults.standardUserDefaults().objectForKey("customArray") as? NSData
{
custom = NSKeyedUnarchiver.unarchiveObjectWithData(data) as! [customData]
}
Note: Here I am saving and retrieving an array of the custom class objects.
Taking #chrissr's answer and running with it, this code can be implemented into a nice category on NSUserDefaults to save and retrieve custom objects:
#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
Usage:
[[NSUserDefaults standardUserDefaults] saveCustomObject:myObject key:#"myKey"];
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")
}
}
to store and retrieve:
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
}
Synchronize the data/object that you have saved into NSUserDefaults
-(void)saveCustomObject:(Player *)object
{
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
NSData *myEncodedObject = [NSKeyedArchiver archivedDataWithRootObject:object];
[prefs setObject:myEncodedObject forKey:#"testing"];
[prefs synchronize];
}
Hope this will help you. Thanks