I am using NSUserDefaults in my application. It was working fine until i was having ios 4.3 and xcode 4.0. But now i have updated to ios 5 and xcode 4.2...
It's giving error!
NSString *storedLanguage = [[NSUserDefaults standardUserDefaults] objectForKey:#"language"];
*** -[NSUserDefaults objectForKey:]: message sent to deallocated instance 0x26e800
I don't know how to resolve it..i have tried all my effort!
Any help will be appreciated!
Thanks
Well from your question its looking like early release of some object.
Cant say where is the problem.
But give a try to this one
NSUserDefaults *defaults = [[NSUserDefaults standardUserDefaults] retain];
NSString * storedLanguage = [NSString stringWithFormat:#"%#",[defaults objectForKey:#"language"]];
[defaults release];
=============================== OR ================================
This one
NSString *sessionId=[NSString stringWithFormat:#"%#",[[NSUserDefaults standardUserDefaults]valueForKey:#"language"]];
They might help you...
Cheers
Please do the same thing said by Naved but with little modification.
NSUserDefaults *defaults = [[NSUserDefaults standardUserDefaults] retain];
NSString * storedLanguage = [defaults objectForKey:#"language"];
[defaults release];
Use a different key for your settings that doesn't collide with reserved (existing but inaccessible) setting names. (e.g. "MyUsersLanguageSettingsKey")
It's working fine now.. Actually there is one thing in ios5. If you release your nsdefaults in one class, you can't use anywhere in the application..
I was releasing the NSDefaults in my appdelegate file. so it was not working in other classes..But it was working in ios4.. I don't know why it was working here?
Thanks to all for giving time!!
Related
I'm having this issue with NSUserDefaults. It is saving the defaults until I kill the app in the background then when I return all the defaults are gone. They are also gone every time a build a new version onto my device. But again, they are there within app so long as I don't kill it in the background. It's working fine in iOS 6. Thoughts?
Take your value in string(or any other as per your requirement) and save the string in user defaults
NSUserDefaults *userdefault=[NSUserDefaults standardUserDefaults];
NSString *str=[NSString stringWithFormat:#"%#",[dicUser objectForKey:#"device_token"]];
[userdefault setObject:str forKey:#"YOURKEY"];
Since you haven't your code, so i am giving example which is perfectly working for me on iOS 7, give it a try. Hopefully works for you too.
For saving boolean value
bool flag = YES;
[[NSUserDefaults standardUserDefaults] setBool:flag forKey:#"flag"];
For retrieving boolean value
bool flag = [[NSUserDefaults standardUserDefaults] boolForKey:#"flag"];
make sure few things like you have declared the userDefaults before using it and if you've taken that in you AppDelegate file then here is a sample code how i am saving values and it works fine so try it this way
APP_DELEGATE.userDefaults = [NSUserDefaults standardUserDefaults];
[APP_DELEGATE.userDefaults setObject:#"unChecked" forKey:#"CheckMark"];
[APP_DELEGATE.userDefaults synchronize];
here APP_DELEGATE is declared like this in my AppDelegate.h file
#define APP_DELEGATE ((AppDelegate*)[[UIApplication sharedApplication] delegate])
hope it helps!
I'm experiencing some strange NSUserDefaults behaviour. I save my data, then synchronize, then do a NSlog of the NSUserDefaults to make sure its saved. The data is shown as saved properly from the NSlog, but when I completely close the app (double click home button and kill the app) when it restarts the value has not changed. Whats even stranger is if I repeat the code several times by saving NSUserDefaults, killing the app, reloading the NSUserDefaults sometimes it gets saved properly and other times it does not.
I read this post Strange NSUserDefaults behavior but I am calling synchronize so I don't think thats my problem.
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
[prefs setObject:#"MyString" forKey:#"testString"];
[[NSUserDefaults standardUserDefaults] synchronize];
NSLog(#"%#", [[NSUserDefaults standardUserDefaults] dictionaryRepresentation]);
Any help is greatly appreciated.
What really confuses me is if the NSLog of standardUserDefaults shows the data is saved why wouldn't it be after the app has been killed???
Thanks
UPDATE
Looks like the issue was with a mixup in mutable and immutable arrays i was saving to NSUserDefaults. I used mutablecopy when I was retrieving the data and seemed to solve the issue.
For getting the value you could use something like this
NSUserDEfaults *ud = [NSUserDefault standarUserDefaults];
[ud objectForKey=#"YourKey"];
If it returns nil it hasn't been saved.
I have an application developed using iOS5. I have used the storyboard to design the whole screens. The problem I am facing right now is that, when the user runs the application for the very first time, I have to show a view for the user to register. I have no clue on earth on how to do it. I have created the registration forms on the storyboard itself.
Can someone put some light on this issue please?
Thankx in advance.
Try this (and also check this):
Set a value after the user starts the application:
[[NSUserDefaults standardUserDefaults] setValue:[NSNumber numberWithInt:1] forKey:#"registered"];
[[NSUserDefaults standardUserDefaults] synchronize];
and then check with this:
NSNumber *numb=[[NSUserDefaults standardUserDefaults] objectForKey:#"registered"];
if ([numb isEqualToNumber:[NSNumber numberWithInt:1]]) {
NSLog(#"registered");
}else{
NSLog(#"not registered");
}
I have written code in -(void)applicationWillEnterForeground:(UIApplication *)application , but my application is not detecting the change made in the settings bundle, new settings work when application restarts, someone please help me how to make changes in application's settings while application is running
Try to -(BOOL)synchronize; the NSUserDefaults.
After setting the values in NSUserDefaults try calling [[NSUserDefaults standardUserDefaults] synchronize]; so that the values get written to disk.
in your applicationWillEnterForeground: methode after this line
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults], add this line
[defaults synchronize];
I want to ship my iPhone app with some preferences but I don't need to create a "Settings App" using a plist and all that. I would like to do this using NSUserDefaults and know how to store and retrieve using this class. However, I'm struggling with how to have an initial set of preferences there when the user loads the app for the first time. Should I retrieve my NSUserDefaults in ViewDidLoad and if they return nil, set them at that point? Or is there a better method?
I'd do it like you proposed. Check whether the user default keys do exist already and if not, create them using default values.
Where you do this check is up to you, but of course it should happen before any part of your app actually needs some of the info. So, like mbehan suggested, you might want to perform that init check within didFinishLaunching of your appdelegate.
There's a method for that:
[[NSUserDefaults standardUserDefaults] registerDefaults:aDictionary];
The method takes a dictionary of keys/values for NSUserDefaults to use if the user hasn't set anything more specific.
You need to call this every time the app starts. Apple suggest:
The contents of the registration domain are not written to disk; you need to call this method each time your application starts. You can place a plist file in the application's Resources directory and call registerDefaults: with the contents that you read in from that file.
I spent some time reviewing the iPhone documentation and multiple posts. I think the following is adequate for most purposes if you do not want to create settings for your app in the Settings application.
Here is a code snippet that you can drop in AppDelegate didFinishLaunching:
NSString *test = #"Test";
NSString *testKey = #"TestKey";
NSString *test2 = #"Test2";
NSString *test2Key = #"Test2Key";
NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:test,testKey,test2,test2Key,nil];
[[NSUserDefaults standardUserDefaults] registerDefaults:dict];
/*
Alternative if we want to create default values in a file called Defaults.plist in Resources folder
[[NSUserDefaults standardUserDefaults] registerDefaults:[NSDictionary dictionaryWithContentsOfFile:[[NSBundle mainBundle] pathForResource:#"Defaults" ofType:#"plist"]]];
To set the preference within the app:
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:#"MyNewTest" forKey:#"TestKey"];
To retrieve the preference within the app:
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSString *results = [defaults stringForKey:#"TestKey"];
Can also use the following syntax:
intForKey:
floatForKey:
boolForKey:
objectForKey:
Returns Objective-C object like NSString, NDDate, or NSNumber
If the object is not a string, may need to specify the value, such as
Label.text = [[defaults objectForKey:#"TestPreferenceStoredAsNumber"]stringValue];
*/
Place the following in AppDelegate applicationWillTerminate and applicationDidEnterBackground:
[[NSUserDefaults standardUserDefaults]synchronize];
Then to view the preferences, place this code in a convenient spot:
// View all keys and values in Console
NSLog(#"%#", [[NSUserDefaults standardUserDefaults] dictionaryRepresentation]);