I have an issue persisting data in local storage for an NSMutableArray containing a list of NSStrings.
I have a save method and a get method both appear to work when the app is running. However, once I close the app and restart the items in the array are gone.
NSMutableArray*ImageTags;
Get Data
-(NSMutableArray*)GetDataNSMutableArray:(NSString*)ItemName
{
NSMutableArray *GetData = [[NSMutableArray alloc] init];
NSUserDefaults *currentDefaults = [NSUserDefaults standardUserDefaults];
NSData *dataRepresentingSavedArray = [currentDefaults objectForKey:ItemName];
if (dataRepresentingSavedArray != nil)
{
NSArray *oldSavedArray = [NSKeyedUnarchiver unarchiveObjectWithData:dataRepresentingSavedArray];
if (oldSavedArray != nil)
GetData = [[NSMutableArray alloc] initWithArray:oldSavedArray];
else
GetData = [[NSMutableArray alloc] init];
}
return GetData;
}
Save Data
-(void)SaveDataNSMutableArray:(NSString*)ItemName:(NSMutableArray*)Data
{
[[NSUserDefaults standardUserDefaults] setObject:[NSKeyedArchiver archivedDataWithRootObject:Data] forKey:ItemName];
}
How items are added
[ImageTags addObject:Control.titleLabel.text]
How array is saved
[super SaveDataNSMutableArray:CVC_ImageURL:ImageTags];
How array is retrieved
ImageTags = [super GetDataNSMutableArray:CVC_ImageURL];
NSUserDefaults always return immutable instances.
Unrelated:
(Conventions says that methodNames should always begin with a small letter).
[[NSUserDefaults standardUserDefaults] synchronize]
To dump all the contents from NSUserDefaults onto persistent store
Your can not store mutable array to user defaults. Store the immutable copy and retrieve that and convert to mutable ones to access during the next launch.
You can do synchronization while saving:
-(void)SaveDataNSMutableArray:(NSString*)ItemName:(NSMutableArray*)Data
{
[[NSUserDefaults standardUserDefaults] setObject:[NSKeyedArchiver archivedDataWithRootObject:Data] forKey:ItemName];
[[NSUserDefaults standardUserDefaults] synchronize] //add this code of a line.
}
Related
I have created application that record sound and display that sound file in tableview. In that application when sound is recorded than it's filepath will store in a array , which array i use to populate my tableview. But my problem is that when i close the application then my array will be empty , and i lost my recorded file.
So now how can i get my recorded file when i open my app second time. I am storing sound file in document directory.
Store array in NSUserDefaults. Retrive and Store the array in NSUserDefaults .. see the example of NSUserDefaults
In AppDelegate.h file just declare variable...
NSUserDefaults *userDefaults;
NSMutableArray *yourArray;
after...
In AppDelegate.m Fille in applicationDidFinishLonching: Method
userDefaults = [NSUserDefaults standardUserDefaults];
NSData *dataRepresentingtblArrayForSearch = [userDefaults objectForKey:#"yourArray"];
if (dataRepresentingtblArrayForSearch != nil) {
NSArray *oldSavedArray = [NSKeyedUnarchiver unarchiveObjectWithData:dataRepresentingtblArrayForSearch];
if (oldSavedArray != nil)
yourArray = [[NSMutableArray alloc] initWithArray:oldSavedArray];
else
yourArray = [[NSMutableArray alloc] init];
} else {
yourArray = [[NSMutableArray alloc] init];
}
[yourArray retain];
after that when you want to insert Data in this UserDefaults Use Bellow Code...
[appDelegate.yourArray addObject:yourDataString];///set your value or anything which you want to store here...
NSData *data=[NSKeyedArchiver archivedDataWithRootObject:appDelegate.yourArray];
[appDelegate.userDefaults setObject:data forKey:#"yourArray"];
[appDelegate.userDefaults synchronize];
i hope this help you...
Hi I have my ALAsset URL save in NSMutableArray,
"ALAsset - Type:Photo, URLs:assets-library://asset/asset.JPG?id=119A0D2D-C267-4B69-A200-59890B2B0FE5&ext=JPG",
"ALAsset - Type:Photo, URLs:assets-library://asset/asset.JPG?id=92A7A24F-D54B-496E-B250-542BBE37BE8C&ext=JPG",
"ALAsset - Type:Photo, URLs:assets-library://asset/asset.JPG?id=77AC7205-68E6-4062-B80C-FC288DF96F24&ext=JPG
I wasnt able to save NSMutableArray in NSUserDefaults due to it having an error Note that dictionaries and arrays in property lists must also contain only property values.
Im thinking of using this :
- (void)encodeWithCoder:(NSCoder *)encoder {
//Encode properties, other class variables, etc
[encoder encodeObject:self.selectedPhotos forKey:#"selectedPhotos"];
}
- (id)initWithCoder:(NSCoder *)decoder {
if((self = [super init])) {
//decode properties, other class vars
self.selectedPhotos = [decoder decodeObjectForKey:#"selectedPhotos"];
}
return self;
}
then save and retrieve it with this code:
- (void)saveCustomObject:(MyCustomObject *)obj {
NSData *myEncodedObject = [NSKeyedArchiver archivedDataWithRootObject:obj];
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:myEncodedObject forKey:#"myEncodedObjectKey"];
}
- (MyCustomObject *)loadCustomObjectWithKey:(NSString *)key {
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSData *myEncodedObject = [defaults objectForKey:key];
MyCustomObject *obj = (MyCustomObject *)[NSKeyedUnarchiver unarchiveObjectWithData: myEncodedObject];
return obj;
}
But I somehow dont quite get it, still crashes in my code. Dont know how. And I wasnt able to save it in NSUserDefaults. Hope someone help. Really been having problem with this a while. Hope someone guide me on the right path of saving and retrieving it the right way from NSUserDefaults. Then back to a NSMutableArray.
The NSUserDefaults only takes a restricted set of classes as objects. See the documentation. You must take care only to store values of these types (NSData, NSString, NSNumber, NSDate, NSArray, or NSDictionary, and of course it applies recursively) in the dictionary.
To store the URLs in the NSUserDefaults, store them as strings, then read them back as URLs. If you need to have the dictionary in the current format, you may have to transform it before saving it.
- (void) saveMyUrls
{
NSMutableArray* urls = [NSMutableArray arrayWithCapacity:self.myUrls.count];
for(NSURL* url in self.myUrls) {
[urls addObject:[url absoluteString]];
}
[[NSUserDefaults standardUserDefaults] setObject:urls forKey:#"myUrls"];
}
- (void) loadUrls
{
NSArray* urls = [[NSUserDefaults standardUserDefaults] objectForKey:#"myUrls"];
self.myUrls = [NSMutableArray arrayWithCapacity:urls.count];
for(NSString* urlString in urls) {
[self.myUrls addObject:[NSURL URLWithString:urlString]];
}
[[NSUserDefaults standardUserDefaults] setObject:urls forKey:#"myUrls"];
}
If you need to save more information than just the URL, let's say a user-specified label, you could save the object as a NSDictionary instead, e.g.
- (void) saveMyUrlsWithLabels
{
NSMutableArray* objs = [NSMutableArray arrayWithCapacity:self.myObjects.count];
for(MyObject* obj in self.myObjects) {
[objs addObject:[NSDictionary dictionaryWithKeys:#"url", #"label"
forObjects:obj.url.absoluteString, obj.userSpecifiedLabel];
}
[[NSUserDefaults standardUserDefaults] setObject:objs forKey:#"myObjects"];
}
Maybe you should do it like this:
- (MyCustomObject *)loadCustomObjectWithKey:(NSString *)key {
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults synchronize]; // note this
NSData *myEncodedObject = [defaults objectForKey:key];
MyCustomObject *obj = nil;
// it would be even better
// to wrap this into #try-#catch block
if(myEncodedObject)
{
obj = (MyCustomObject *)[NSKeyedUnarchiver unarchiveObjectWithData: myEncodedObject];
}
return obj;
}
Also note that if you want to use NSKeyedArchiver and NSKeyedUNarchiver your MyCustomObject class has to conform to NSCoding protocol. Check NSCoding protocol reference and Archives and Serializations Programming Guide.
This is another way to do it and yes you can use NSUserDefaults. Basically you get asset URL, save it and then convert it back to an asset / image
//SET IT
ALAsset *asset3 = [self.assets objectAtIndex:[indexPath row]];
NSMutableString *testStr = [NSMutableString stringWithFormat:#"%#", asset3.defaultRepresentation.url];
//NSLog(#"testStr: %# ...", testStr);
[[NSUserDefaults standardUserDefaults] setObject:testStr forKey:#"userPhotoAsset"];
[[NSUserDefaults standardUserDefaults] synchronize];
//GET IT
NSString *assetUrlStr = [[NSUserDefaults standardUserDefaults] objectForKey:#"userPhotoAsset"];
NSURL* aURL = [NSURL URLWithString:assetUrlStr];
NSLog(#"aURL: %# ...", aURL);
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
[library assetForURL:aURL resultBlock:^(ALAsset *asset)
{
UIImage *copyOfOriginalImage = [UIImage imageWithCGImage:[[asset defaultRepresentation] fullScreenImage] scale:1.0 orientation:UIImageOrientationUp];
imgVwPortrait.image = copyOfOriginalImage;
}
failureBlock:^(NSError *error)
{
// error handling
NSLog(#"failure-----");
}];
For some weird reason golferStats is not storing info correctly...
I cut out a bunch of stuff in this code to the bare basics why is is still not working?
Problem: The last NSLOG returns nil when it should return a huge array...
NSMutableDictionary *golferStats = [[NSMutableDictionary alloc] init];
golferStats = [userDefaults objectForKey:#"golferStats"];
[golferStats setObject:golferTwoIconCounter forKey:golferName]; //golferName is k
[userDefaults setObject:golferStats forKey:#"golferStats"];
[userDefaults synchronize];
NSLog(#"SAVED SCORE CARD");
NSLog(#"%#",[golferStats objectForKey:#"k"]);
NSMutableDictionary *golferStats = [[NSMutableDictionary alloc] init];
golferStats = [userDefaults objectForKey:#"golferStats"];
...
[golferStats release];
You first create an NSDictionary and then you assign over top of it, thus leaking memory and presumably getting nil back from user defaults. setObject:forKey: in the nil dictionary is a no-op, and then you are setting it back into the user defaults.
EDIT:
Try checking if there is a dictionary first:
NSDictionary *golferStats = [userDefaults objectForKey:#"golferStats"];
if (golferStats == nil) {
golferStates = [NSDictionary dictionary]; // this will not leak
}
...
If you want to preserve the existing contents of the dictionary in cases where it already does exist, do this:
NSMutableDictionary *golferStats = [userDefaults objectForKey:#"golferStats"];
if (!golferStats) golferStats = [[[NSMutableDictionary alloc] init] autorelease];
[golferStats setObject:golferTwoIconCounter forKey:golferName];
[userDefaults setObject:golferStats forKey:#"golferStats"];
[userDefaults synchronize];
// no [golferStats release] because of autorelease above
I can't seem to re edit this object in my ios User Defaults. Here is my code...
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setObject:nil forKey:#"savedScoreCards2"];
Before I did this I set the key savedScoreCards to a huge 3-d dictionary, and now when I try to over write it or even set the key to nil that huge 3-d dictionary that I set up a while ago is still there. I can't seem to over write/ replace it will nothing (nil), or another huge 3-d dictionary. Any ideas?
UPDATE:
+ (void)saveCurrentScoreCard
{
//save score card
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
NSMutableDictionary *savedScoreCards = [[NSMutableDictionary alloc] init];
[userDefaults setObject:nil forKey:#"savedScoreCards2"];//reset at beginning
NSMutableArray *golferOneScoresu = [userDefaults arrayForKey:#"golferOneScoresArray"];
NSMutableArray *golferTwoScoresu = [userDefaults arrayForKey:#"golferTwoScoresArray"];
NSMutableDictionary *golferIconsu = [userDefaults objectForKey:#"golferIconsFirstScene"];
NSMutableArray *golferThreeScoresu = [userDefaults arrayForKey:#"golferThreeScoresArray"];
NSMutableArray *golferFourScoresu = [userDefaults arrayForKey:#"golferFourScoresArray"];
NSMutableDictionary *golferIcons2u = [userDefaults objectForKey:#"golferIcons"];
NSMutableArray *golferNamesu = [userDefaults objectForKey:#"golferNames"];
NSMutableArray *golferNames = [[NSMutableArray alloc] initWithArray:golferNamesu copyItems:YES];
NSMutableDictionary *golferIconsSceneOne = [[NSMutableDictionary alloc]initWithDictionary:golferIconsu];
NSMutableDictionary *golferIcons = [[NSMutableDictionary alloc]initWithDictionary:golferIcons2u];
NSMutableArray *golferFourScores = [[NSMutableArray alloc] initWithArray:golferFourScoresu copyItems:YES];
NSMutableArray *golferThreeScores = [[NSMutableArray alloc] initWithArray:golferThreeScoresu copyItems:YES];
NSMutableArray *golferOneScores = [[NSMutableArray alloc] initWithArray:golferOneScoresu copyItems:YES];
NSMutableArray *golferTwoScores = [[NSMutableArray alloc] initWithArray:golferTwoScoresu copyItems:YES];
NSMutableDictionary *currentScoreCard = [[NSMutableDictionary alloc] init];
[currentScoreCard setObject:golferNames forKey:#"golferNames"];
[currentScoreCard setObject:golferIconsSceneOne forKey:#"golferIconsFirstScene"];
[currentScoreCard setObject:golferIcons forKey:#"golferIcons"];
[currentScoreCard setObject:golferOneScores forKey:#"golferOneScoresArray"];
[currentScoreCard setObject:golferTwoScores forKey:#"golferTwoScoresArray"];
[currentScoreCard setObject:golferThreeScores forKey:#"golferThreeScoresArray"];
[currentScoreCard setObject:golferFourScores forKey:#"golferFourScoresArray"];
[savedScoreCards setObject:currentScoreCard forKey:#"1"];
NSLog([golferIconsSceneOne objectForKey:#"30101"]);
[userDefaults setObject:savedScoreCards forKey:#"savedScoreCards2"];
[userDefaults synchronize];
NSLog(#"SAVED SCORE CARD");
}
Use [userDefaults removeObjectForKey:#"savedScoreCards2"] if you're just trying to remove a stored value.
Also call [userDefaults synchronize]; to "flush" your changes immediately. I think the [userDefaults synchronize] is probably what you're missing.
NSUserDefaults do not save automatically when you make a change to them. Try adding this line below the ones you've posted above:
[userDefaults synchronize];
This should save any changes you've made.
As a side note, I'm not sure you can save 'nil' into NSUserDefaults; at its core I believe it's a dictionary, in which nil values cannot be set. So you might try setting an empty object, instead.
Hope this helps, let me know if you need any more information!
I'm creating a very simple bookmarks menu for my app. I just need to save 3 strings for each object.
I was thinking of using core data but I don't want this to be connected with my core database for various reasons. Therefore what other easy options do I have? NSUserDefaults or .plist?
I just need to save the 3 strings for each object then load them into a table view to be viewed.
I'd recommend NSUserDefaults - is certainly easier. I tend to only use plist files for static data that I want to be editable as the developer, but from the application want it to be read-only (such as coordinates for objects on an embedded map image).
From your description, you would probably want to store an NSArray containing NSDictionary.
// Get the user defaults object
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
// Load your bookmarks (editable array)
NSMutableArray *bookmarks = [[NSMutableArray alloc]init];
NSArray *bookmarksLoaded = [userDefaults arrayForKey:#"bookmarks"];
if (bookmarksLoaded != nil) {
[bookmarks initWithArray:bookmarksLoaded];
} else {
[bookmarks init];
}
// Add a bookmark
NSMutableDictionary *bookmark = [NSMutableDictionary new];
[bookmark setValue:#"value" forKey:#"name"];
[bookmark setValue:#"value" forKey:#"description"];
[bookmark setValue:#"value" forKey:#"code"];
[bookmarks addObject:bookmark];
// Save your (updated) bookmarks
[userDefaults setObject:bookmarks forKey:#"bookmarks"];
[userDefaults synchronize];
// Memory cleanup
[bookmarks release];