I have the following code for saving a value and an string. I want to use If statement to check my value.
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:#"Baseball bat" forKey:#"Weaponsname"];
NSInteger Attack1 = [defaults integerForKey:#"Attack"];
NSString *Weapon = [defaults stringForKey:#"Weaponsname"];
if([Weapon isEqual: #"Baseball bat"]){
[defaults setInteger:(Attack1+50) forKey:#"Attack"];
NSLog(#"Baseball bat");
}
[defaults synchronize];
So if i have the Baseball bat, the Attack should increase by 50. But it doesn't.
What wrong with the code?
Thanks
For string comparison you should use the isEqualToString method found in the NSString class.
if ([Weapon isEqualToString:#"Baseball bat"]) { ... }
Related
I need two NSMutableArray that will contain NSString.
These arrays are:
ListOFUserNames=[NSMutableArray array];
SituationstoName =[NSMutableArray array];
I have two different sets of strings that go into each mutable array.
After named gets added to Listofusernames
Situation gets added to SituationstoName
[ListOFUserNames addObject:AfterNamed];
[SituationstoName addObject:Situation];
I am trying to save listofusernames and situationstoname with their respective strings.
NSUserDefaults *something = [NSUserDefaults standardUserDefaults];
[something setObject:ListOFUserNames forKey:#"somedata"];
[something synchronize];
NSUserDefaults *something2 = [NSUserDefaults standardUserDefaults];
[something2 setObject:SituationstoName forKey:#"somedata2"];
[something2 synchronize];
In the method that loads them, nothing comes out.
The code for that method is:
NSUserDefaults *somet = [NSUserDefaults standardUserDefaults];
NSUserDefaults *somet2 = [NSUserDefaults standardUserDefaults];
ListOFUserNames = [somet objectForKey:#"somedata"] ;
SituationstoName = [somet2 objectForKey:#"somedata2"] ;
[somet synchronize];
[somet2 synchronize];
The problem is that it is not loading the strings that are saved in the mutable arrays.
//initialise array
NSMutableArray *listOFUserNames=[[NSMutableArray alloc] init];
NSMutableArray *situationstoName =[[NSMutableArray alloc] init];
//add content in the array
[listOFUserNames addObject:AfterNamed];
[situationstoName addObject:Situation];
(Before storing also check if your array contains objects or is empty.)
//Store these array in `NSUserDefaults`
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setObject:listOFUserNames forKey:#"NameData"];
[userDefaults setObject:situationstoName forKey:#"SituationData"];
[userDefaults synchronize];
//Access data where ever you want to be
//(listOFUserNames and situationstoName must be array)
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
listOFUserNames = [userDefaults objectForKey:#"NameData"] ;
situationstoName = [userDefaults objectForKey:#"SituationData"] ;
Here is the NSUserdefaults code.
-(IBAction)SaveButton:(id)sender {
NSUserDefaults *defaults=[NSUserDefaults standardUserDefaults];
NSString* Assignment0Text = screen0.text;
[defaults setObject:Assignment0Text forKey:#"Assignment0Text"];
[defaults synchronize];
}
-(IBAction)LoadButton:(id)sender {
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSString* temp0 = [defaults objectForKey:#"Assignment0Text"];
screen0.text = temp0;
}
This code above means that the program only saves and loads the string value inside the textfield/label.
My question is, how can I modify this code so that the NSUserDefaults can save and load the value of a variable (in this case int & float), not the text inside the textfield/label? So that when I load the program, all the integer/float values are the same. Not what's written in the text inside the textfield/label are the same. All that the screen is showing is a float number with variable called runningtotal.
screen0.text = [NSString stringWithFormat:#"%2.2f", runningtotal];
if I understand your question correctly, you should use wrappers for variables like int:
int value = 5;
[defaults setObject:#(value) forKey:#"Assignment0Number"];
the magic is the NSUserDefaults can not store non-object values like 5. You need to create NSObject object, store the value within it, and then save this object into the NSUserdefaults. That is what happens when I write '#(value)'.
If to be more precise, #(value) is literal for [NSNumber numberWithInt:value], and since NSNumber is the object and subclass of NSObject, the value can be stored now.
EDIT:
here is what you probably want (I assume that runningtotal is the class variable):
-(IBAction)SaveButton:(id)sender {
NSUserDefaults *defaults=[NSUserDefaults standardUserDefaults];
[defaults setObject:#(runningtotal) forKey:#"Assignment0Text"];
[defaults synchronize];
}
-(IBAction)LoadButton:(id)sender {
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSNumber* temp0 = [defaults objectForKey:#"Assignment0Text"];
runningtotal = [temp0 intValue];
}
I have an app already in the AppStore that uses NSUserDefaults. Some of the defaults are Default settings that I go ahead and set when the app is first launched, and then the user is allowed to change them later if they wish. So, in my AppDelegate appDidFinishLaunchingWithOptions I put:
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
if (! [defaults boolForKey:#"notFirstRun"]) {
[defaults setBool:YES forKey:#"notFirstRun"];
[defaults setInteger:0 forKey:#"verseKey"];
[defaults synchronize];
}
The issue I am having now is I want to add some more Default settings in the NSUserDefault category, so I want to make it look like this:
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
if (! [defaults boolForKey:#"notFirstRun"]) {
[defaults setBool:YES forKey:#"notFirstRun"];
NSString *smalltitle = #"4";
NSString *smallarticle = #"3";
[defaults setObject:smalltitle forKey:#"Title"];
[defaults setObject:smallarticle forKey:#"Article"];
[defaults setInteger:0 forKey:#"verseKey"];
[defaults synchronize];
}
I know that this will cause an issue for those who have already downloaded the app, and are merely updating it. They will not run that code because the notFirstRun Bool has already been set to YES. Any thoughts on what I should do here?
The proper solution is to not actually populate NSUserDefaults with default values. Instead, use the registerDefaults: method.
At app startup you do:
NSUserDefaults *default = [NSUserDefaults standardUserDefaults];
[defaults registerDefaults:#{
#"Title" : #"4",
#"Article" : #"3",
#"verseKey" : #0
}];
That's it. Call this every time the app is run. These defaults are not actually persisted. The value is only returned if there isn't already an explicit value for the key. You can update these defaults all you want without affecting any existing values.
Make a new notFirstRun Boolean value (i.e. notFirstRunTwo). That will be 'NO' for existing users, too.
I suggest to do the following :
check userdefaults for stored app version if it is equal to the current or not , if not.
store the current app version and do your first launch initialization
the code
`
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSString *appVersion = [NSString stringWithFormat:#"%#",[[NSBundle mainBundle] objectForInfoDictionaryKey:#"CFBundleShortVersionString"]];
if (! [defaults objectForKey:appVersion ])
{
/// store the current version and then do your first run functions
[defaults setObject:[NSNumber numberWithInt:1] forKey:appVersion];
/// here do your first run
......
}`
Trying to save button state as hidden when navigating off the view controller.
under IBAction
btnonce.hidden = YES;
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setValue:Act1Button.hidden forKey:#"isHidden"];
Calling it in ViewDidLoad
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
btnonce.hidden = [userDefaults valueForKey:#"isHidden"];
I'm getting the error: Implicit conversion of "BOOL" (aka signed char) to ID is disallowed with ARC
How to rectify this?
For saving the Bool value in NSUserDefaults use this code
[defaults setBool:Act1Button.hidden forKey:#"isHidden"];
For retrieving use this
btnonce.hidden = [userDefaults boolForKey:#"isHidden"];
I set up multiple NSUserDefaults in my app that work for the most part. The NSUserDefaults are called from one ViewController and implemented at another (such as in a game with a level select). This seems to work well, until the user presses the back button on the level select screen. When they try to go back to the level select viewController, the NSUserDefaults are not loaded onto the screen.
Here is my code:
LevelSelectViewController:
- (void)viewDidLoad
{
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults synchronize];
[super viewDidLoad];
}
- (void)Level1DidFinish:(Level1 *)controller
{
[self dismissModalViewControllerAnimated:YES];
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
NSInteger rank = [userDefaults integerForKey:#"levelRank"];
{
if (rank == 1) {
button2.hidden = NO;
}
}
}
Level1ViewController:
{
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setInteger:1 forKey:#"levelRank"];
}
You need to call [userDefaults synchronize] after setting a value for a key. The automatic synchronization happens quite rarely, so in this case, while one completes a level, the sync won't have yet happened.
So modify your code like this:
Level1ViewController:
{
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setInteger:1 forKey:#"easyRank"];
[userDefaults synchronize];
}
Your first issue is you are creating an instance of userDefaults, but are not setting any values. So calling synchronize here is actually doing nothing:
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults synchronize];
After you set a your Integer, then you need to call synchronize:
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setInteger:1 forKey:#"easyRank"];
[userDefaults synchronize];
You're setting values for two different keys. What are you expecting to happen?
Either Level1ViewController needs to set a value for levelRank or LevelSelectViewController needs to read the value for the easyRank key.