What&#39;s the easiest way to save a `UIColor` into `NSUserDefaults` and then get it back out?

Saving UIColor to and loading from NSUserDefaults

I&#39;ve added `NSUserDefaults` data retrieval to my app, which is pretty nice. But for testing I would like to reset all the data I added to the defaults database, so that everything is in the state when the user launches the app the first time.

I tried to call:

```
[NSUserDefaults resetStandardUserDefaults];
```

but that doesn&#39;t do anything. The defaults are still saved and can be retrieved.

How can I reset the NSUserDefaults data in the iPhone simulator?

How to delete data from NSUserDefaults? There is quite a few answers how to do it in Objective C, but how about Swift?
So I tried this:

    let defaults = NSUserDefaults.standardUserDefaults()
        defaults.removeObjectForKey(&quot;myKey&quot;)
Didn&#39;t work. Maybe what I really want to delete is not NSUserDefaults?
This is how I save data:

    class MySavedData: NSObject, NSCoding {
        var image: String
    
        init(name: String, image: String) {
            self.image = image
        }
    
        required init(coder aDecoder: NSCoder) {
            image = aDecoder.decodeObjectForKey(&quot;image&quot;) as! String
        }
    
        func encodeWithCoder(aCoder: NSCoder) {
            aCoder.encodeObject(image, forKey: &quot;image&quot;)
        }
    }

    class ViewController: &lt;...&gt; {
        var myData = [MySavedData]() //Later myData gets modified and then function save() is called

        func save() {
            let savedData = NSKeyedArchiver.archivedDataWithRootObject(myData)
            let defaults = NSUserDefaults.standardUserDefaults()
            defaults.setObject(savedData, forKey: &quot;myKey&quot;)
        }
    }

**EDIT:** Just to clear some things - data that is being saved is small (not even close to 100kb)

And maybe I am saving data not to NSUserDefaults (I am new to programming), so here is how I get it (load):

    let defaults = NSUserDefaults.standardUserDefaults()
    if let savedData = defaults.objectForKey(&quot;myData&quot;) as? NSData {
        myData = NSKeyedUnarchiver.unarchiveObjectWithData(savedData) as! [UserLogin]
        }


Delete key values for NSUserDefaults in Swift

I have a switch called `soundSwitch`, I&#39;m saving the state of the button using an `userDefault` as such:

    @IBAction func soundsChanged(sender: AnyObject) {
            if soundSwitch.on{
                defaults.setBool(true, forKey: &quot;SoundActive&quot;)
                print(&quot;Sound ON&quot;)
            }else{
                defaults.setBool(false, forKey: &quot;SoundActive&quot;)
                print(&quot;Sound OFF&quot;)
            }
        }

Currently, the actual default value is initially false when the user first launches the application. 

How can I implement the defaults to be true if the user launches the app and they haven&#39;t been configured yet.

I&#39;ve seen methods in `Objective-C`, but nothing in Swift. From what I&#39;ve seen you can do it in the app delegate somehow, or in a `PList` file. How do I do either of those ones?

Swift - How to set initial value for NSUserDefaults

Hi I am trying to use `NSUserDefaults` to save some default values in database. I am able to save the values in the `NSUserDefaults` (even checked it in `NSLog`).
Now I need the values in app delegate when the application is restarted. But I am not getting anything in the `NSUserDefaults`. Following is my code from my class where I save the values in `NSUserDefaults`:

    NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
				
				[prefs setObject:appDel.dictProfile forKey:@&quot;dict&quot;];
				NSLog(@&quot;%@&quot;,[prefs valueForKey:@&quot;dict&quot;]);

Following is my code from App Delegagte:

    NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
	
	NSLog(@&quot;%@&quot;,[prefs valueForKey:@&quot;dict&quot;]);
the above code always returns me null.
Can some one please help me?

Why is NSUserDefaults not saving my values?

I&#39;m using `+[NSUserDefaults standardUserDefaults]` to store application settings. This consists of roughly a dozen string values. Is it possible to delete these values permanently instead of just setting them to a default value?

Clearing NSUserDefaults

I will be storing a few strings (maybe 10-20). I am not sure if I should use NSUserDefaults to save them, or write them out to a plist. What is considered best practice? NSUserDefaults seems like it is less lines of code, therefore quicker to implement.

I&#39;d like to add that these string values will be added/removed by the user.

Should I use NSUserDefaults or a plist to store data?

I have a login-screen in my iOS app.
The username and password will be saved in the `NSUserDefaults` and be loaded into the login-screen again when you enter the app again (of course, `NSUserDefaults` are permanent).

Now, the user have the possibility to disable the username/password saving feature.

So the `NSUserDefaults` will be cleared then.

But In my app I need this username/password for database queries for the user.
So: Where to store the data except `NSUserDefaults`? 
(This place can / should be deleted when the user quit the app or logout).

iOS: How to store username/password within an app?

Alright, so I&#39;ve been doing some poking around, and I realize my problem, but I don&#39;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&#39;t working.

    -[NSUserDefaults setObject:forKey:]: Attempt to insert non-property value &#39;&lt;Player: 0x3b0cc90&gt;&#39; of class &#39;Player&#39;.

That is the error message I get when I put my custom class, &quot;Player&quot;, in the `NSUserDefaults`.  Now, I&#39;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 &quot;encode&quot; my custom object and then put it in, but I&#39;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&#39;m still having some issues.  Basically, the code crashes now and I&#39;m not sure why, because it doesn&#39;t give any errors.  Perhaps I&#39;m missing something basic and I&#39;m just too tired, but we&#39;ll see.  Here is the implementation of my Custom class, &quot;Player&quot;:

    @interface Player : NSObject {
    	NSString *name;
    	NSNumber *life;
    	//Log of player&#39;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 &quot;Player.h&quot;
    @implementation Player
    - (id)init {
    	if (self = [super init]) {
    		[self setName:@&quot;Player Name&quot;];
    		[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:@&quot;name&quot;];
    	[encoder encodeObject:self.life forKey:@&quot;life&quot;];
    }
    
    -(id)initWithCoder:(NSCoder *)decoder
    {
    	self = [super init];
    	if ( self != nil )
    	{
    		//decode the properties
    		self.name = [decoder decodeObjectForKey:@&quot;name&quot;];
    		self.life = [decoder decodeObjectForKey:@&quot;life&quot;];
    	}
    	return self;
    }
    -(void)dealloc {
    	[name release];
    	[life release];
    	[super dealloc];
    }
    @end

So that&#39;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 &lt;UIApplicationDelegate&gt; {
        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 &quot;MagicApp201AppDelegate.h&quot;
        #import &quot;MainViewController.h&quot;
        #import &quot;Player.h&quot;
        
        @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:@&quot;appHasLaunched&quot;];
        	if (startup == nil) {
    //Make the single player 
    		Player *singlePlayer = [[Player alloc] init];
    		NSLog([[NSString alloc] initWithFormat:@&quot;%@\n%d\n%d&quot;,[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:@&quot;testing&quot;];
    }
    
    -(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&#39;ve narrowed it down to the encryption part of the app, that&#39;s where it crashes, so I&#39;m doing something wrong but I&#39;m not sure what.  Help would be appreciated again, thank you!

(I haven&#39;t gotten around to decrypting yet, as I haven&#39;t gotten encrypting working yet.)

How to store custom objects in NSUserDefaults

How to save a string into the `NSUserDefaults`?




Save string to the NSUserDefaults?

Is there a way to see what&#39;s been saved to `NSUserDefaults` directly?  I&#39;d like to see if my data saved correctly.  

Easy way to see saved NSUserDefaults?

I&#39;m working on a small iPhone app, and I am using `NSUserDefaults` as my data persistence.  It only has to keep track of a few things, such as some names and some numbers so I figure I might as well keep it simple.

I found [this page][1] for some reference, but I don&#39;t think it can answer my question.  Basically, I want to be able to check if a value (or a key) already exists in the `NSUserDefaults` and then do something accordingly.

Some examples: The app starts up, if this is the first time it starts up it outputs an alert saying welcome.  To tell if this is first time it has opened it reads the `UserDefaults` and checks.

Example 2:  It says, &quot;Hello [Name]&quot;, where Name is something you have entered.  If you have opened the app and there is no name, it should say &quot;Hello World.&quot;  I need to check if you have entered a name already and act accordingly.  The name would be stored in `NSUserDefaults`.

Some help here?  I&#39;d really appreciate it!

  [1]: http://developer.apple.com/iphone/library/documentation/Cocoa/Reference/Foundation/Classes/NSUserDefaults_Class/Reference/Reference.html

NSUserDefaults - How to tell if a key exists

I thought I knew what was causing this error, but I can&#39;t seem to figure out what I did wrong.

Here is the full error message I am getting:

&lt;pre&gt;
Attempt to set a non-property-list object (
   &quot;&amp;lt;BC_Person: 0x8f3c140&amp;gt;&quot;
) as an NSUserDefaults value for key personDataArray
&lt;/pre&gt;

I have a `Person` class that I think is conforming to the `NSCoding` protocol, where I have both of these methods in my person class:

    - (void)encodeWithCoder:(NSCoder *)coder {
        [coder encodeObject:self.personsName forKey:@&quot;BCPersonsName&quot;];
        [coder encodeObject:self.personsBills forKey:@&quot;BCPersonsBillsArray&quot;];
    }
    
    - (id)initWithCoder:(NSCoder *)coder {
        self = [super init];
        if (self) {
            self.personsName = [coder decodeObjectForKey:@&quot;BCPersonsName&quot;];
            self.personsBills = [coder decodeObjectForKey:@&quot;BCPersonsBillsArray&quot;];
        }
        return self;
    }

At some point in the app, the `NSString` in the `BC_PersonClass` is set, and I have a `DataSave` class that I think is handling the encoding the properties in my `BC_PersonClass`.
Here is the code I am using from the `DataSave` class:

    - (void)savePersonArrayData:(BC_Person *)personObject
    {
       // NSLog(@&quot;name of the person %@&quot;, personObject.personsName);
        
        [mutableDataArray addObject:personObject];
        
        // set the temp array to the mutableData array
        tempMuteArray = [NSMutableArray arrayWithArray:mutableDataArray];
        
        // save the person object as nsData
        NSData *personEncodedObject = [NSKeyedArchiver archivedDataWithRootObject:personObject];
        
        // first add the person object to the mutable array
        [tempMuteArray addObject:personEncodedObject];
        
        // NSLog(@&quot;Objects in the array %lu&quot;, (unsigned long)mutableDataArray.count);
        
        // now we set that data array to the mutable array for saving
        dataArray = [[NSArray alloc] initWithArray:mutableDataArray];
        //dataArray = [NSArray arrayWithArray:mutableDataArray];
        
        // save the object to NS User Defaults
        NSUserDefaults *userData = [NSUserDefaults standardUserDefaults];
        [userData setObject:dataArray forKey:@&quot;personDataArray&quot;];
        [userData synchronize];
    }

I hope this is enough code to give you an idea o what I am trying to do. 
Again I know my problem lie with how I am encoding my properties in my BC_Person class, I just can&#39;t seem to figure out what though I&#39;m doing wrong.

Thanks for the help!






Attempt to set a non-property-list object as an NSUserDefaults

There&#39;s two ways of storing an NSDate in NSUserDefaults that I&#39;ve come across.

Option 1 - setObject:forKey:
----------------------------

    // Set
    NSDate *myDate = [NSDate date];
    [[NSUserDefaults standardUserDefaults] setObject:myDate forKey:@&quot;myDateKey&quot;];

    // Get
    NSDate *myDate = (NSDate *)[[NSUserDefaults standardUserDefaults] objectForKey:@&quot;myDateKey&quot;];

Option 2 - timeIntervalSince1970
--------------------------------------



    // Set
    NSDate *myDate = [NSDate date];
    NSTimeInterval myDateTimeInterval = [myDate timeIntervalSince1970];
    [[NSUserDefaults standardUserDefaults] setFloat:myDateTimeInterval forKey:@&quot;myDateKey&quot;];

    // Get
    NSTimeInterval myDateTimeInterval = [[NSUserDefaults standardUserDefaults] floatForKey:@&quot;myDateKey&quot;];
    NSDate *myDate = [NSDate dateWithTimeIntervalSince1970:myDateTimeInterval];


Pros and Cons
-------------

**Option 1**

This seems to be compact and logical. However, I&#39;ve got worries about this going wrong because of [Date Formatter bugs][1]. 

**Option 2**

This seems to be clumsy. I&#39;m also unsure of the accuracy of it - in one test I did, when I retrieved the date back it was out by 48 seconds, despite the Apple Docs saying that NSTimeInterval has &quot;subsecond accuracy&quot;.

Requirements
------------

Whatever method I choose, it must be:

   1. Precise to within a second.

   2. Readable and reliable.


My Question
-----------

Is the inaccuracy with Option 2 because I&#39;m doing something wrong?

Which out of these two options would you use?

Is there another option that I&#39;m not aware of?

Thanks!


  [1]: http://osdir.com/ml/cocoa-dev/2009-04/msg01935.html

What&#39;s the optimum way of storing an NSDate in NSUserDefaults?

I&#39;m currently working on a iOS app developed in Swift and I need to store some user-created content on the device but I can&#39;t seem to find a simple and quick way to store/receive the users content on the device. 

**Could someone explain how to store and access local storage?**

The idea is to store the data when the user executes an action and receive it when the app starts.

How to save local data in a Swift app?

How can I use UserDefaults to save/retrieve strings, booleans and other data in Swift?

How can I use UserDefaults in Swift?

I&#39;d like to save an `NSMutableDictionary` object in `NSUserDefaults`. The key type in `NSMutableDictionary` is `NSString`, the value type is `NSArray`, which contains a list of object which implements `NSCoding`. Per document, `NSString` and `NSArray` both are conform to `NSCoding`.

I am getting this error: 

&gt; [NSUserDefaults setObject: forKey:]: Attempt to insert non-property value.... of class NSCFDictionary.


Why NSUserDefaults failed to save NSMutableDictionary in iOS?

Are the following two lines equivalent?

1.
    `[[NSUserDefaults standardUserDefaults] removeObjectForKey:@&quot;example key&quot;]`

2.
    `[[NSUserDefaults standardUserDefaults] setObject:nil forKey:@&quot;example key&quot;]`


NSUserDefaults removeObjectForKey vs. setObject:nil

Is this the case? Do NSUserDefaults get reset when you submit an update to an app on the App Store, or are they reset?

My app is crashing when updated but not crashing when downloaded fully - so I&#39;m trying to determine what could possibly be different in the updated session to the freshly downloaded session.

Cheers,
Nick.

Do NSUserDefaults persist through an Update to an app in the Appstore?

I&#39;d like to save some simple data. On the iPhone, I can do it with [`NSUserDefaults`][1] in Objective-C.

What is the similar command here in Android?

I&#39;m just saving a few variables, to be reused as long as the application is installed. I don&#39;t want to use a complicated database just to do that.

[1]: https://developer.apple.com/reference/foundation/nsuserdefaults?language=objc

Android equivalent of NSUserDefaults in iOS

this may sound real NOOB! I want to check if it&#39;s the second time the user enters my application, so to keep the run count I&#39;m using `NSUserDefaults`. I have implemented the following code in my `rootViewController`&#39;s `viewDidLoad` method:

        NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
    
        NSLog(@&quot;hello %ld&quot;, (long)[userDefaults integerForKey:@&quot;runCount&quot;]);
    
        if ([userDefaults integerForKey:@&quot;runCount&quot;] != 1) {
            //not the 2nd run
            [userDefaults setInteger:1 forKey:@&quot;runCount&quot;];
            NSLog(@&quot;not 2nd run&quot;);
        } else {
            //second run or more
            NSLog(@&quot;2nd run&quot;);
        }
    
        [userDefaults synchronize];

everything works fine, but the problem is that when I uninstall(delete and re-install) the application according to [here](https://stackoverflow.com/questions/9163798/is-data-stored-in-nsuserdefaults-persists-through-application-updates-and-on-app) and [here](https://stackoverflow.com/questions/7520800/are-values-stored-in-nsuserdefaults-removed-when-the-app-that-put-them-there-is) the data should be cleared, but it is not and after re-installing the app previous data is still showing up.
I&#39;m running my app on iOS simulator using xCode6-beta and targeting the application on iOS 8

NSUserDefaults not cleared after app uninstall on simulator

When the `rootViewController` of my application is loaded, I want to be able to check whether or not the users login credentials have been saved to `NSUserDefaults`.

Basically, when the user loads the application and he/she doesn&#39;t have her login credentials saved, a `modalAlertView` will be pushed and the user will be able to save their credentials appropriately. This saves those `UITextField` strings to a respective `NSUserDefault` object. However, is it possible, that when this saving is done, I can create an `NSUserDefault` object which is a boolean and change the value to a yes?

Meaning that the boolean is already set to no, and when the user saves their login credentials, it also changes the boolean to a yes?

iOS: Use a boolean in NSUserDefaults

I&#39;m trying to check if the a user default exists, seen below:

    func userAlreadyExist() -&gt; Bool {
        var userDefaults : NSUserDefaults = NSUserDefaults.standardUserDefaults()
        
        if userDefaults.objectForKey(kUSERID) {
            return true
        }
        
        return false
    }

However, no mater what it will always return true even when the object doesn&#39;t exist yet? Is this the right way for checking existence ?

Check if UserDefault exists - Swift

I need create an array to add objects with this format like a dictionary in Swift : [&quot;key1&quot;: &quot;value1&quot;, &quot;key2&quot;: &quot;value2&quot;]
        
When I try to save it with `NSUserDefaults` all is correct, but when read `NSUserDefaults` with the key this crashes. What type of data does my var obj need?

    let def = NSUserDefaults.standardUserDefaults()
    var key = &quot;keySave&quot;
    var element: AnyObject!

    var array1: [AnyObject!] = []
    array1.append([&quot;key1&quot;: &quot;val1&quot;, &quot;key2&quot;: &quot;val2&quot;])
    array1.append([&quot;key1&quot;: &quot;val1&quot;, &quot;key2&quot;: &quot;val2&quot;])

    //save
    var savestring : [AnyObject!]
    savestring = array1
    var defaults = NSUserDefaults.standardUserDefaults()
    defaults.setObject(savestring, forKey: key)
    defaults.synchronize()

    //read
    var obj: [AnyObject!] = []
    if(obj != nil){
        print(&quot;size: &quot;)
        print(obj.count) //vary long value confused..
        element = obj[0]  //crash
        print(element.objectForKey(&quot;key1&quot;))
    }


how to save and read array of array in NSUserdefaults in swift?

I am currently trying to save a custom Swift class to NSUserDefaults. Here is the code from my Playground:

    import Foundation
    
    class Blog : NSObject, NSCoding {
        
        var blogName: String?
        
        override init() {}
        
        required init(coder aDecoder: NSCoder) {
            if let blogName = aDecoder.decodeObjectForKey(&quot;blogName&quot;) as? String {
                self.blogName = blogName
            }
        }
        
        func encodeWithCoder(aCoder: NSCoder) {
            if let blogName = self.blogName {
                aCoder.encodeObject(blogName, forKey: &quot;blogName&quot;)
            }
        }
        
    }
    
    var blog = Blog()
    blog.blogName = &quot;My Blog&quot;

    let ud = NSUserDefaults.standardUserDefaults()    
    ud.setObject(blog, forKey: &quot;blog&quot;)


When I run the code, I get the following error

&gt; Execution was interrupted, reason: signal SIGABRT.

in the last line (`ud.setObject`...)

The same code also crashes when in an app with the message

&gt; &quot;Property list invalid for format: 200 (property lists cannot contain
&gt; objects of type &#39;CFType&#39;)&quot;

Can anybody help? I am using Xcode 6.0.1 on Maverick. Thanks.


Saving custom Swift class with NSCoding to UserDefaults

I would like to print all values I saved via `NSUserDefaults` without supplying a specific Key. 

Something like printing all values in an array using `for` loop. Is there a way to do so?

Is there a way to get all values in NSUserDefaults?

I am new to iPhone development and `objective C`.
I have used `NSUserDefaults` to store some values in my app.
But I don&#39;t know that if there is any limit for storing values in `NSUserDefaults`.
Can anyone help me to know that.

Thanks in advance.

Is there any limit in storing values in NSUserDefaults?

I have a struct that I want to save to UserDefaults. Here&#39;s my struct

    struct Song {
        var title: String
        var artist: String
    }
    
    var songs: [Song] = [
        Song(title: &quot;Title 1&quot;, artist &quot;Artist 1&quot;),
        Song(title: &quot;Title 2&quot;, artist &quot;Artist 2&quot;),
        Song(title: &quot;Title 3&quot;, artist &quot;Artist 3&quot;),
    ]

In another ViewController, I have a UIButton that appends to this struct like

    @IBAction func likeButtonPressed(_ sender: Any) {   
       songs.append(Song(title: songs[thisSong].title, artist: songs[thisSong].artist))
    }

I want it so that whenever the user clicks on that button also, it saves the struct to UserDefaults so that whenever the user quits the app and then opens it agian, it is saved. How would I do this?



Save Struct to UserDefaults

Which is the place I should be storing tokens for when the user logins in to a service? I&#39;m not saving passwords (obviously where I&#39;d use the Keychain) but just the token. A lot of places say just use NSUserDefaults but some people on StackOverflow seem really keen on the Keychain.

Is NSUserDefaults fine?

Storing authentication tokens on iOS - NSUserDefaults vs Keychain?

I am using NSUserDefaults to store some data in my application.

    NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
    [prefs setObject:@&quot;dummy string&quot; forKey:@&quot;lastValue&quot;];
    [prefs synchronize];

For testing purposes I need to see the System Preferences plist file where my NSUserDefaults data is saving on the Mac.

I know where the iOS application user defaults are stored, but I don&#39;t know about mac application. Where is a Mac Application&#39;s NSUserDefaults Data Stored?

Where is a Mac Application&#39;s NSUserDefaults Data Stored?

I&#39;m having a news `ViewController` and a `TeamViewController`. The `TeamViewController` contain a tableView of teamObjects which when selected is added into array. I want to add this array into `NSUserDefaults` so i can access them from the `NewsController` which contain a url request where the teamObjects is needed. However i keep getting:

&gt; &#39;Attempt to insert non-property list object (
      &quot;&lt;Striky.Team: 0x7fd0d171a8c0&gt;&quot;
   ) for key teams&#39;

I&#39;m open for other suggestions if there is better ways than storing it in `NSUserDefaults`


`didSelectRowAtIndexPath` method

    override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
        tableView.deselectRowAtIndexPath(indexPath, animated: true)
        
        
        let team = self.teamArray[indexPath.row] as Team
        var removed = false
        
        for (index, value) in enumerate(self.teamSelected) {
            if (value == team) {
                self.teamSelected.removeAtIndex(index)
                removed = true
            }
        }
        
        if (!removed) {
            self.teamSelected.append(team)
        }
        
        var userDefaults = NSUserDefaults.standardUserDefaults()
        userDefaults.setValue(self.teamSelected, forKey: &quot;teams&quot;)
        userDefaults.synchronize()
        
        tableView.reloadData()
    }


My object

    class Team: NSObject{
        var id: Int!
        var name: NSString!
        var shortname: NSString!

    
        init(id: Int, name:NSString, shortname: NSString) {
            self.id = id
            self.name = name
            self.shortname = shortname

        }
    
    }

Save custom objects into NSUserDefaults

I have a simple object which conforms to the `NSCoding` protocol.

    import Foundation
    
    class JobCategory: NSObject, NSCoding {
        var id: Int
        var name: String
        var URLString: String
        
        init(id: Int, name: String, URLString: String) {
            self.id = id
            self.name = name
            self.URLString = URLString
        }
        
        // MARK: - NSCoding
        required init(coder aDecoder: NSCoder) {
            id = aDecoder.decodeObject(forKey: &quot;id&quot;) as? Int ?? aDecoder.decodeInteger(forKey: &quot;id&quot;)
            name = aDecoder.decodeObject(forKey: &quot;name&quot;) as! String
            URLString = aDecoder.decodeObject(forKey: &quot;URLString&quot;) as! String
        }
        
        func encode(with aCoder: NSCoder) {
            aCoder.encode(id, forKey: &quot;id&quot;)
            aCoder.encode(name, forKey: &quot;name&quot;)
            aCoder.encode(URLString, forKey: &quot;URLString&quot;)
        }
    }

I&#39;m trying to save an instance of it in `UserDefaults` but it keeps failing with the following error.

&gt; Terminating app due to uncaught exception &#39;NSInvalidArgumentException&#39;, reason: &#39;Attempt to insert non-property list object &lt;UserDefaultIssue.JobCategory: 0x1462f960&gt; for key jobCategory&#39;

This is the code where I&#39;m saving in `UserDefaults`.

    enum UserDefaultsKeys: String {
        case jobCategory
    }
    
    class ViewController: UIViewController {
        
        @IBAction func didTapSaveButton(_ sender: UIButton) {
            let category = JobCategory(id: 1, name: &quot;Test Category&quot;, URLString: &quot;http://www.example-job.com&quot;)
            
            let userDefaults = UserDefaults.standard
            userDefaults.set(category, forKey: UserDefaultsKeys.jobCategory.rawValue)
            userDefaults.synchronize()
        }
    }

I replaced the enum value to key with a normal string but the same error still occurs. Any idea what&#39;s causing this?

Attempt to insert non-property list object when trying to save a custom object in Swift 3

I use the NSUserDefaults dictionary to store basic information such as high scores etc so that when the user closes the app data is not lost. Anyways I use:

    NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];

to store data. If I wish to store a new high score for example then I would do:

    [prefs setInteger:1023 forKey:@&quot;highScore&quot;];
    [prefs synchronize];  //this is needed in case the app is closed. 

and later if I wish to retrieve the high score I would do:

    [prefs integerForKey:@&quot;highScore&quot;];


anyways the point is that I store a lot of other things because the `NSUserDefaults enable` you to store `booleans`, `integers`, `objects` etc.   what method would I have to execute to delete all keys so that NSUserDefaults becomes like the fist time I launch the app?

I am looking for something like:

    NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
    [prefs deleteAllKeysAndObjectsInTheDictionary];

or maybe there is a way of getting all keys and I have to loop through each object but I don&#39;t know how to remove them. 


EDIT:


I have tried :

    NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
    [NSUserDefaults resetStandardUserDefaults];
    [prefs synchronize];

and I still am able to retrieve a high score....



Delete all keys from a NSUserDefaults dictionary iOS

What is the difference between:

    [[NSUserDefaults standardUserDefaults] registerDefaults:
      [NSDictionary dictionaryWithObjectAndKey:anObject, @&quot;something&quot;]];

And this:

    [[NSUserDefaults standardUserDefaults] setObject:anObject forKey:@&quot;something&quot;];

What is the use of -[NSUserDefaults registerDefaults:]?

I have two `NSMutableArray`&#39;s. They consist of images or text.
The arrays are displayed via a `UITableView`.
When I kill the app the data within the `UITableView` gets lost.
How to save array in `UITableView` by using `NSUserDefault`?



How to save NSMutablearray in NSUserDefaults

I have this code to remove all `UserDefaults` data from the app:

    let domain = Bundle.main.bundleIdentifier!
    UserDefaults.standard.removePersistentDomain(forName: domain)
         
    print(Array(UserDefaults.standard.dictionaryRepresentation().keys).count)

But I got `10` from the print line. Shouldn&#39;t it be `0`?


How to remove all UserDefaults data ? - Swift

I am using the following code to save an object to UserDefaults (previously NSUserDefaults) using xcode 8:

    let defaults = UserDefaults.standard()
    defaults.set(someObject, forKey: &quot;someObject&quot;)
    print(defaults.object(forKey: &quot;someObject&quot;))

someObject is a dictionary and I am running on the simulator. 

For some reason this is not saving the value and &#39;nil&#39; is printed.  Wondering if it&#39;s a simulator problem. 

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