This question already has answers here:
iOS: Use a boolean in NSUserDefaults
(6 answers)
Closed 7 years ago.
view and viewcontroller are separate. I am already tried NSUserDefaults it's not working.
[[NSUserDefaults standardUserDefaults] setValue:BOOLCondition forKey:#"YES"];
[[NSUserDefaults standardUserDefaults] synchronize];
it's say impact conversion of bool to id is disallowed with arc
how to pass that bool value
***** view to viewcontroller not viewcontroller to viewcontroller
Use the below code to store BOOL value in NSUserDefaults
BOOL BOOLCondition = YES; or BOOL BOOLCondition = NO;
[[NSUserDefaults standardUserDefaults] setBool:BOOLCondition forKey:#"YES"];
[[NSUserDefaults standardUserDefaults] synchronize];
I always do this to store a BOOL value, because I prefer better to work objects directly:
BOOL _myBool = TRUE; // or FALSE...
[[NSUserDefaults standardUserDefaults] setValue:#(_myBool) forKey:#"boolValue"];
[[NSUserDefaults standardUserDefaults] synchronize];
and restoring back the stored value:
BOOL _boolValue = [[[NSUserDefaults standardUserDefaults] valueForKey:#"boolValue"] boolValue]; // will be FALSE if the value is `nil` for the key
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.
This question already has answers here:
Clearing NSUserDefaults
(15 answers)
Closed 7 years ago.
I am using NSUserDefaults lots of time in my app to store some values, but on "refresh button" i want to clear all stored values, Is there any way to clear all NSUserDefaults values?
You can remove all stored value using below code see here for more details
- (void)removeUserDefaults
{
NSUserDefaults * userDefaults = [NSUserDefaults standardUserDefaults];
NSDictionary * dict = [userDefaults dictionaryRepresentation];
for (id key in dict) {
[userDefaults removeObjectForKey:key];
}
[userDefaults synchronize];
}
Or in shortest way
[[NSUserDefaults standardUserDefaults] setPersistentDomain:[NSDictionary dictionary] forName:[[NSBundle mainBundle] bundleIdentifier]];
Swift
let defaults = UserDefaults.standard
defaults.dictionaryRepresentation().keys.forEach { (key) in
defaults.removeObject(forKey: key)
}
You can clear your user defaults by using following statements -
NSString *appDomain = [[NSBundle mainBundle] bundleIdentifier];
[[NSUserDefaults standardUserDefaults] removePersistentDomainForName:appDomain];
You can call a selector on the refresh button and keep the above statements in it, as-
- (void) refreshUserDefaults
{
NSString *appDomain = [[NSBundle mainBundle] bundleIdentifier];
[[NSUserDefaults standardUserDefaults] removePersistentDomainForName:appDomain];
}
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 use this code to save:
[[NSUserDefaults standardUserDefaults] setValue:#"vruch" forKey:#"nastoikaIP"];
[[NSUserDefaults standardUserDefaults] synchronize];
and this code to load:
NSString* automanual = [[NSUserDefaults standardUserDefaults]
valueForKey:#"nastroikaIP"];
if ([automanual isEqualToString:#"vruch"]) {
autovruch.selectedSegmentIndex = 1;
[self obnovittext];
}
You should not use the method setValue: (from the NSKeyValueCoding protocol) but setObject: (from the NSUserDefaults class) to store the string.
[[NSUserDefaults standardUserDefaults] setObject:#"vruch" forKey:#"nastroikaIP"];
[[NSUserDefaults standardUserDefaults] synchronize];
You can retrieve the string using the method stringForKey:
NSString* automanual = [[NSUserDefaults standardUserDefaults] stringForKey:#"nastroikaIP"];
Finally, note that it is generally better to define constants for the keys you use in NSUserDefaults to avoid any mistyping errors, which may be hard to debug when they happen.
Edit
It looks like you already did a mistyping error nastoikaIP != nastroikaIP. Notice the missing/extra r letter.
Your saving a string so you need to setObject rather than setValue
[[NSUserDefaults standardUserDefaults] setObject:#"vruch" forKey:#"nastoikaIP"];
[[NSUserDefaults standardUserDefaults] synchronize];
and change it for the loading aswell
NSString* automanual = [[NSUserDefaults standardUserDefaults] objectForKey:#"nastroikaIP"];
if ([automanual isEqualToString:#"vruch"]) {
autovruch.selectedSegmentIndex = 1;
[self obnovittext];
}
This question already has answers here:
Closed 11 years ago.
Possible Duplicate:
How can I save and load the alpha values of a UIButton in an app?
I would like to save the state of the UIButton (e.g. its alpha value and whether it is hidden or not) and this would then load up when the user quits and reloads the app.
I've tried some bits of code with NSUserDefaults but with no luck.
Could somebody help with some sample code so that I can save and load the button's state?
Thanks,
James
Related to Shaharyar's answer (i don't know how to comment):
in this case you need to use NSNumber.
[[NSUserDefaults standardUserDefaults] setValue:[NSNumber numberWithFloat:SOME_FLOAT] forKey:KEY];
because float is not an object, but NSNumber is one.
EDITED:
1) To make sure your defaults are created after the application runs at first time:
in your AppDelegate's initialize-method:
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSDictionary *appDefaults = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithFloat:SOME_FLOAT], #"YOUR_KEY",
nil];
[defaults registerDefaults:appDefaults];
2) Updating defaults after:
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
[prefs setFloat:FLOAT_VALUE forKey:#"YOUR_KEY"];
[prefs synchronize];
3) Read defaults:
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
float FLOAT_VALUE = [prefs floatForKey:#"YOUR_KEY"];
Can you post some of the code?
NSUserDefaults is the place to store such information..
Assumption:
Did you make a call to [NSUserDefaults synchronize] after setting the values?
Code:
// Setting a value
[[NSUserDefaults standardUserDefaults] setValue:VALUE forKey:KEY];
[[NSUserDefaults standardUserDefaults] synchronize];
// Getting a value
NSString *var1 = [[NSUserDefaults standardUserDefaults] valueForKey:KEY];
In your case it would be:
// Setting a value
[[NSUserDefaults standardUserDefaults] setFloat:VALUE forKey:KEY];
[[NSUserDefaults standardUserDefaults] synchronize];