EDIT: On change language to Hindi...i want to change the value of saved NSUserdefault as well! how do i do it?
I have create a singleton class which save the value for e.g.:
singleton.userStatus=NSLocalizedString(#"yes", nil);
I have set
"yes" = #"YES";
in hindi
"yes" = #"हाँ";
in my NSLocalizedString
and
[[NSUserDefaults standardUserDefaults] setObject:singleton.userStatus forKey:#"USER_STATUS"];
Now i am comparing it
NSString *checkStatus = [[NSUserDefaults standardUserDefaults] objectForKey:#"USER_STATUS"]; // i have set its default value YES
if ([checkStatus isEqualToString:NSLocalizedString(#"yes", nil)])
{
// not comes here
}
else
{
//
}
Related
I have two methods in my .m file .And i want to access by different values but in my Facebook variable gives nil value but if i use only one line and remove second line of object for key then it work fine for one method .
How i do this which work for my both methods
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[[NSUserDefaults standardUserDefaults] synchronize];
user=[defaults objectForKey:#"userid"];
facebook=[defaults objectForKey:#"FACEBOOKprofile"];
facebook =[defaults objectForKey:#"VLCC"];
if ([facebook isEqualToString:#"VLCCFACEBOOK"])
{
[self FacebookRecord];
}
else if([facebook isEqualToString:#"VLCC"])
{
[self VlccRecord];
}
assume that
Choice-1
// for accessing the both condition in same time
Initially Store the UserDefault value based on your method.
if you are access with facebook , on that time store the string like
[[NSUserDefaults standardUserDefaults] setObject:"VLCCFACEBOOK" forKey:#"FACEBOOKprofile"];
[[NSUserDefaults standardUserDefaults] synchronize];
if you are access with VLCC , on that time store the string like
[[NSUserDefaults standardUserDefaults] setObject:"VLCC" forKey:#"VLCCprofile"];
[[NSUserDefaults standardUserDefaults] synchronize];
and retrieve the both and check like
if ([[[NSUserDefaults standardUserDefaults]
objectForKey:#"FACEBOOKprofile"]isEqualToString:#"VLCCFACEBOOK"])
{
[self FacebookRecord];
}
if([[[NSUserDefaults standardUserDefaults]
objectForKey:#"VLCCprofile"] isEqualToString:#"VLCC"])
{
[self VlccRecord];
}
Choice-2
// for accessing single condition on single time
if you are access with facebook , on that time store the string like
[[NSUserDefaults standardUserDefaults] setObject:"VLCCFACEBOOK" forKey:#"FACEBOOKprofile"];
[[NSUserDefaults standardUserDefaults] synchronize];
if you are access with VLCC , on that time store the string like
[[NSUserDefaults standardUserDefaults] setObject:"VLCC" forKey:#"FACEBOOKprofile"];
[[NSUserDefaults standardUserDefaults] synchronize];
and retrieve the both and check like
if ([[[NSUserDefaults standardUserDefaults]
objectForKey:#"FACEBOOKprofile"]isEqualToString:#"VLCCFACEBOOK"])
{
[self FacebookRecord];
}
else if([[[NSUserDefaults standardUserDefaults]
objectForKey:#"FACEBOOKprofile"] isEqualToString:#"VLCC"])
{
[self VlccRecord];
}
In your code, the [self VlccRecord] method will always get called because you are overwriting the facebook variable.
facebook=[defaults objectForKey:#"FACEBOOKprofile"];
facebook =[defaults objectForKey:#"VLCC"];
If you are looking to append the two strings : Then use the stringbyAppendingString method.
int a = 10;
a = 20;
print >> a; //20
int a = 10;
print1 >> a; //10
a = 20;
print2 >> a; //20
Here,
a = facebook;
print1 = [self FacebookRecord];
print2 = [self VlccRecord];
I believe you'll understand.
I have a UILabel called 'labelA'. In this label is the letter 'A'.
When I am using NSUserDefault and start my app, the label is empty, but I don't know why?
Here is my ViewController.m file:
- (void)viewDidLoad {
NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
self->labelA.text = [defaults objectForKey:#"labelAtext"]; }
- (void)defaults {
NSString *textLabelA = labelA.text;
NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:textLabelA forKey:#"labelAtext"];
[defaults synchronize];
}
Here is my NSString in the ViewController.h file
NSString *textLabelA =#"A";
When i load my app without NSUserDefault the labelA.text = A.
does anybody know what's my problem. Thanks a lot :-)
Your method defaults is not being called anywhere, so the text value is never stored in NSUserDefaults.
[self defaults]; // This needs to be called somewhere before you try and access NSUserDefaults.
You should also be accessing self using dot notation, not ->
self.labelA.text = [defaults objectForKey:#"labelAText"];
-> is for dereferencing a struct in C, for more information - What is "->" in Objective C?
When you use UserDefaults. You should first test if you get a value as if the value doesnt exist you need to set it or not.
NSString * myPreference = #"labelAtext";
- (void)viewDidLoad {
NSUserDefaults* userDefault = [NSUserDefaults standardUserDefaults];
id labelValue = [userDefault objectForKey:myPreference];
if (labelValue) // if preference exist
self.labelA.text = labelValue; // set ur label
else
[self storeDefaultValue]; // you store a default value
}
- (void)storeDefaultValue
{
NSString *myDefaultValue = nil;
if ([self.labelA.text isNotEqualToString:#""]) // if ur label not empty
myDefaultValue = self.labelA.text;
else
myDefaultValue = #"Not Available"; // or whatever defaults value you want
NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:myDefaultValue forKey:myPreference];
[defaults synchronize];
}
What do you really want to achieve as I don't really understand whats the point of storing a value in preference as soon as you load your app. Give more details on what is your goal.
This question already has answers here:
Saving application data state on exit
(3 answers)
Closed 8 years ago.
How can I save a value of a variable in objective-c, for example a BOOL, and when I return for the app the value of my variable is the last value setted?! For exemple:
BOOL *firstAccess;
firstAccess = TRUE;
I finish the app and return, and i wished that my variable were TRUE, again.
Thanks
You can use NSUserDefaults to save data permanently:
BOOL firstAccess;
/// ...
[[NSUserDefaults standardUserDefaults] setBool:firstAccess forKey:#"FIRSTACCESS"];
To retrieve the value:
firstAccess = [[NSUserDefaults standardUserDefaults] boolForKey:#"FIRSTACCESS"];
See the documentation for NSUserDefaults for more information.
You can store the BOOL value in NSUserDefaults:
#define MYFirstAccessKey #"firstAccessKey"
+ (void)initialize {
// Set the default value. This is returned if nothing has been written for the key.
[[NSUserDefaults standardUserDefaults] registerDefaults:#{ MYFirstAccessKey : #YES }];
}
- (void)someMethod {
// Read the value.
BOOL firstAccess = [[NSUserDefaults standardUserDefaults] boolForKey:MYFirstAccessKey];
if (firstAccess) {
// ... do stuff ...
}
// ... later ...
// Set value.
[[NSUserDefaults standardUserDefaults] setBool:NO forKey:MYFirstAccessKey];
[[NSUserDefaults standardUserDefaults] synchronize]; // Write to disk now.
}
I have the following code below which uses a stepper to set the value of the myLabel.
I have it set to store the value to NSUserDefaults.
1) I also need to set the stepper value to the same figure as that which I have put into the label. Can someone advise how to do this please? (I have added a comment to the code where I feel this should be.)
2) I would also like to check before loading the saveString that it is actually set, and if not, set a default value. Could you also advise how to achieve this?
Thanks.
- (void)viewWillAppear:(BOOL)animated
{
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSString *loadString = [defaults objectForKey:#"saveString"];
self.myLabel.text = loadString;
// Need to set the stepper value to that in loadString
}
- (IBAction)stepChanged:(id)sender {
NSString *saveString = [NSString stringWithFormat:#"%d",
[[NSNumber numberWithDouble:[(UIStepper *)sender value]] intValue]];
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:saveString forKey:#"saveString"];
[defaults synchronize];
self.myLabel.text = saveString;
}
I have updated the code as follows:-
- (void)viewWillAppear:(BOOL)animated
{
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSNumber *loadNumber = [defaults objectForKey:#"saveNumber"];
self.myLabel.text = [NSString stringWithFormat:#"%#",loadNumber];
UIStepper *stepper = [[UIStepper alloc] init];
stepper.value = [NSNumber numberWithDouble:loadNumber];
}
- (IBAction)stepChanged:(id)sender {
NSNumber *saveNumber = [NSNumber numberWithDouble:[(UIStepper *)sender value]];
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:saveNumber forKey:#"saveNumber"];
[defaults synchronize];
self.myLabel.text = [NSString stringWithFormat:#"%#",saveNumber];
}
However, the line 'stepper.value = [NSNumber numberWithDouble:loadNumber];' errors with the error 'Sending 'NSNumber *__strong" to a parameter of incompatible type 'double''. I think the stepper will only accept a double, but am unsure what I am doing wrong to set it.
What I need to achieve is the following:-
1) Have a default value set in NSUserDefaults for saveNumber, which will be used until a variation is made by the user.
2) on load or view appearing, use saveNumber to set the value of both stepper.value and myLabel.
3) ensure that when changed with the stepper, the value is updated in myLabel, and NSUserDefaults saveNumber is also updated.
Can anyone advise where I am going wrong, and help correct my code please?
Further, something I just realised as I am typing this is that in the final app, I will have this setting on a different viewController to the one that will use the NSUserDefaults savedNumber value. With this in mind, can you also let me know how to ensure that savedNumber is available not only to this viewController, but any other one I require the values on?
Many thanks.
Regarding question 1:
Just make one instance variable int stepper; (in your .h)
then in viewWillAppear set this variable as you do at the moment; and set
stepper = [defaults integerForKey:#"stepper"];
In your IBAction just call
stepper++;
self.myLabel.text = [NSString stringWithFormat:#"%i",stepper];
and save it in your NSUserDefaults.
Regarding question 2: NSUserDefaults offers the possibility to register defaults for certain keys, have a look at this:
NSDictionary *defaults = [NSDictionary dictionaryWithObjectsAndKeys:
#"test", #"key",
nil];
[[NSUserDefaults standardUserDefaults] registerDefaults:defaults];
If there is nothing set in the NSUserDefaults, the objectForKey method will return nil, so your loadString will be nil.
Now, you could convert the value you saved from a string into a number, something like [loadString floatValue];, but a probably better way would be to store an NSNumber into the userDefaults with the correct value, and recreate your label text with stringWithFormat method.
I am making a game in Xcode which in includes a scoring system in each level. Here I have some code that gets an NSString (passedValue1) by using a delegate.
Then i add the code to receive the value in my viewDidLoad and display my value in a UILabel
-(void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib
// Do any additional setup after loading the view, typically from a nib
NSString *key=#"labelKey";
if(passedValue1){
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
NSObject * object = [prefs valueForKey:key];
if(object != nil){
NSUserDefaults *defults = [NSUserDefaults standardUserDefaults];
[defults setValue:passedValue1 forKey:key];
[defults synchronize];
}
else{
NSUserDefaults *defults = [NSUserDefaults standardUserDefaults];
NSInteger readScore=[[[NSUserDefaults standardUserDefaults] valueForKey:key] integerValue];
NSInteger newValue=readScore+[passedValue1 integerValue];
[defults setValue:[NSString stringWithFormat:#"%d",newValue] forKey:key];
[defults synchronize];
}
}
label.text = [[NSUserDefaults standardUserDefaults]objectForKey:key];
}
Once I have displayed the value I then save it into a label using a NSUserDefault. However, once I have replayed my game and have another score value I would like to add the new passedValue1 value to the currently saved value...
For example:
say I play my level and I get the score value of 10. The value is then saved and I replay my level. I would then like to take the saved value and add it to the value i just scored. So thats say the second value I have scored is 20. I would then like my code to add them together and give me a value of 30.
can anyone help because the code I'm using does not correctly do the function that I want to do which is add the previous and the currently passed value.
What is wrong with my code??
Thanks in advance.
You shouldn't use valueForKey: for this (it's not what you might think it is, see Key-Value Coding). Instead, you should use objectForKey: or in your case integerForKey:.
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSInteger value = [defaults integerForKey:key];
value += [passedValue1 integerValue];
[defaults setInteger:value forKey:key];
BOOL success = [defaults synchronize];
It seems that you got your if condition wrong, it should be
if (object == nil) { // <-- you have object != nil here !
// save new value
} else {
// read old value, add something, save new value
}