In my App, I am trying to implement SettingView by NSUserDefault. So, I wrote program code as follows:
Method example of saving user setting:
+ (void)setUserAutoPlaySetting:(BOOL)setting {
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setBool:setting forKey:kAutoPlaySettingKey];
[userDefaults synchronize];
}
This method is received user setting as BOOL and saves by NSUserDefault.
I confirmed my App save user setting on simulator but not on real Device.
In addition, this method is enable to save NO but disable to save YES on a real device.
Can anyone please tell how can I overcome this problem? Thanks.
Related
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.
Greetings,
I am a new programmer in iphone development . i am making an application with Open Erp i require to a login page which occur only the first time the app is run and also a settings page to change it when required.
I have used NSUSerDefaults to access variables around classes but not sure how to save it and log in automatically the second time the app is run.
I appreciate any help available .
Thank you
You can set object for key in NSUserDefaults as
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setObject:username forKey:#"userName"];
and to get from defaults use -
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
NSString *user_name = [userDefaults objectForKey:#"userName"];
when you launch your app check for userdefauls for pre saved username if it is nil then display login view otherwise display view that you want.
So I have an iphone app that presents a modal view when it starts if the user has not registered. Once they register, it saves a user ID into NSUserDefaults. When the app starts at a later time, it needs to load this user id in the appdelegate file.
//Registration.m
NSUserDefaults *savedUID = [NSUserDefaults standardUserDefaults];
[savedUID setObject:UID forKey:#"user_id"];
//AuctionTracAppDelegate.m
NSUserDefaults *savedID = [NSUserDefaults standardUserDefaults];
NSString *uidString = [savedID stringForKey:#"user_id"];
My problem is that when I try to load this value at a separate execution, the object I saved is always null. I know for a fact that it is saving the string object correctly. Also, this weird behavior JUST surfaced. This exact code was working earlier, then after working on a totally unrelated file, this code fails. I'm clueless as to what happened. Any hints?
I believe that you need to call the synchronize method.
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:#"dict"];
NSLog(#"%#",[prefs valueForKey:#"dict"]);
Following is my code from App Delegagte:
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
NSLog(#"%#",[prefs valueForKey:#"dict"]);
the above code always returns me null.
Can some one please help me?
If you terminate your app by pressing the home button (in the Simulator or on the device), your NSUserDefaults will get saved.
If you terminate your app by pressing "Stop" in Xcode (in the Simulator or on the device), your NSUserDefaults might get saved, but there's a good chance they won't. NSUserDefaults persists any changes periodically, and if you terminate the process before they've been persisted, they'll be gone. You can force the save by calling:
[[NSUserDefaults standardUserDefaults] synchronize];
Addendum:
In iOS4 (this answer was originally written when iOS3 was the public release), your NSUserDefaults may not get saved when pressing the home button. Manually calling [[NSUserDefaults standardUserDefaults] synchronize] in applicationDidEnterBackground: should ensure that your NSUserDefaults are saved correctly (this should really be a built-in behaviour IMO).
This code works fine for me .
NSUserDefaults *standardUserDefaults = [NSUserDefaults standardUserDefaults];
if (standardUserDefaults) {
[standardUserDefaults setObject:myString forKey:#"Prefs"];
[standardUserDefaults synchronize];
}
You didn't say whether you are running on a device or in the simulator, but if you restart the application in the simulator, all preferences will be reset between launches if you launch from Xcode. The preferences will only be preserved if you relaunch from the simulator itself.
In my case I was saving and retrieving a string. When I synchronized after saving and then retrived in another thread, it was not working properly. The problem was solved by synchronizing both after saving and before retreiving.
to save some variables of my apps I use:
-(void)applicationWillTerminate:(UIApplication *)application {
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
[prefs setFloat: self.viewController.sLabel.contentOffset.y forKey:#"floatKey"];
[prefs setObject:self.viewController.newText forKey:#"stringVal"];
[prefs synchronize];
}
and to retrieve them, via a button, I do the following:
-(IBAction) riprendi:(id) sender {
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
float myFloat = [prefs floatForKey:#"floatKey"];
//some actions here
}
Everything is working on the simulator. However, using it on a real iPhone, the variables' saving and retrieving works just if you press the Home button, exiting the app and opening again but NOT if you switch off/on the iPhone. In this case, the variables get simply lost once you re-open the app...
What am I missing?? This is actually driving me crazy :(
Thank you so much ;)
Fabio
If you mean hitting the lock button on the top of the phone by saying "switching on/off", then it won't work, because locking the phone does not cause an application to quit.
Your applicationWillTerminate: method is only called when you exit you're application to the home screen or to some other application. When the user presses the Sleep button, applicationWillResignActive: will be send to your application-delegate.
Apple's iPhone OS Programming Guide has a section on handling interruptions.
According to Apple's documentation
"NSUserDefaults caches the information to avoid having to open the user’s defaults database each time you need a default value."
If you want to make sure things are saved you should call "synchronize" on your prefs.