I would like to know how can I send a Float value in a UIlabel in Today extension ?
I try this code:
NSUserDefaults *sharedDefaults = [[NSUserDefaults standardUserDefaults] initWithSuiteName:#"group.mywidget"];
myfloat = [[sharedDefaults objectForKey:#"float_widget"]floatValue];
[sharedDefaults synchronize];
And to receive the value i use this code:
NSUserDefaults *defaults = [[NSUserDefaults alloc] initWithSuiteName:#"group.mywidget"];
NSInteger number = [defaults floatForKey:#"float_widget"];
self.numberLabel.text = [NSString stringWithFormat:#"%f", (float)number];
Can you help me please ? thanks
Declare defaults
NSUserDefaults *defaults= [[NSUserDefaults alloc] initWithSuiteName:#"group.mywidge"];
Set
[defaults setFloat:50.5 forKey:"thisKey"];
Read
float myfloat = [defaults floatForKey:"thisKey"];
Also you should note that there should be app group named group.mywidge in capabilities of the main app and the extension
Related
I want to save high score using
synchronize
in my app,but i get gibberish number. Here what i got :
GameScene.m
if (highScore <score) {
highScore = score;
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
[prefs setInteger:highScore forKey:#"highScore"];
[[NSUserDefaults standardUserDefaults] synchronize];
}
GameOver.m
NSUserDefaults *prefs =[NSUserDefaults standardUserDefaults];
NSString *rezult =[prefs stringForKey:#"highScore"];
SKLabelNode *highscorelabel = [SKLabelNode labelNodeWithFontNamed:#"Menlo-Bold"];
highscorelabel.text =[NSString stringWithFormat:#"%ld",(long)rezult];
highscorelabel.position = CGPointMake(CGRectGetMidX(self.frame), 280);
highscorelabel.fontSize = 45;
highscorelabel.zPosition = 5;
[self addChild:highscorelabel];
Why I'm getting wrong value and how to fix this problem?
You're getting a wrong value because rezult is a NSString, you should change this:
NSString *rezult =[prefs stringForKey:#"highScore"];
to this:
NSInteger rezult = [prefs integerForKey:#"highScore"];
try to don't init another nsuserdefaults every time just use
[[NSUserDefaults standardUserDefaults] setValue:surname.text forKey:#"Nume"]; to write
[[NSUserDefaults standardUserDefaults] valueForKey:#"Name"] to read
AND MAKE SURE YOU USE THE SAME OBJECT TYPE!
I have two completely separate tasks being carried out but somehow they seem to connect.
In ViewController 1, I have:
NSString *foo = #"foo";
NSUserDefaults *default1 = [NSUserDefaults standardUserDefaults]
[default1 setObject:foo forKey:#"foo"];
[default1 synchronize];
and when I do:
NSLog(#"%#", [[NSUserDefaults standardUserDefaults] objectForKey:#"foo"]);
The value printed is what I expect it to be.
In ViewController 2, I have:
NSString *bar = #"bar";
NSUserDefaults *default2 = [NSUserDefaults standardUserDefaults]
[default2 setObject:bar forKey:#"bar"];
[default2 synchronize];
And same again when I NSLog it, the value is what I expect it to be.
But somehow when i try to print object #"foo" again it gives me the value for the second object, in this case #"bar"
Any guidance on why my original value is being overridden by the second value even tough the variable/key names are different in the 2 classes?
You are doing this for both:
[foo setObject:bar forKey:#"bar"];
Shouldn't it be:
[defaults1 setObject:foo forKey:#"foo"];
And
[defaults2 setObject:bar forKey:#"bar"];
There is however, a greater problem:
NSString *foo = #"foo";
NSUserDefaults *default1 = [NSUserDefaults standardUserDefaults];
[default1 setObject:foo forKey:#"foo"];
[default1 synchronize];
NSLog(#"%#", [[NSUserDefaults standardUserDefaults] objectForKey:#"foo"]);
NSString *bar = #"bar";
NSUserDefaults *default2 = [NSUserDefaults standardUserDefaults];
[default2 setObject:bar forKey:#"bar"];
[default2 synchronize];
NSLog(#"%#", [[NSUserDefaults standardUserDefaults] objectForKey:#"bar"]);
Will work properly, however you're creating defaults1 and defaults2 which are both instances of standard defaults, so:
NSUserDefaults * defaults1 = [NSUserDefaults standardUserDefaults];
NSUserDefaults * defaults2 = [NSUserDefaults standardUserDefaults];
[NSUserDefaults standardUserDefaults];
Are all pointers to the standardUserDefaults singleton. So they are identical instances. You could simply do:
NSUserDefaults *standardDefaults = [NSUserDefaults standardUserDefaults];
NSString *foo = #"foo";
[standardDefaults setObject:foo forKey:#"foo"];
NSString *bar = #"bar";
[standardDefaults setObject:bar forKey:#"bar"];
[standardDefaults synchronize];
NSLog(#"%#", [[NSUserDefaults standardUserDefaults] objectForKey:#"foo"]);
NSLog(#"%#", [[NSUserDefaults standardUserDefaults] objectForKey:#"bar"]);
You can print out the entire set of user defaults with code like this
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSDictionary *dictionary = [defaults dictionaryRepresentation];
NSLog( #"%#", dictionary );
Note that Apple puts lots of garbage in the user defaults, so you'll have to scroll to the end to see foo and bar. I'm guessing that you have a typo in code that you haven't shown us, and either foo is being overwritten, or foo simply isn't being displayed properly.
The current code in your question (after 1 edit) is all good and should work correctly.
I am building an application in which I want to save some user data by using NSUserDefaults, and it is a property of one of my controllers as following:
#property (nonatomic, strong) NSUserDefaults *userPreference;
#synthesize userPreference = _userPreference;
And I am trying to save something called a scale that should be a float, so I do something like this in the getter to put in some default values of scale in case user did not enter one:
if (!_userPreference) {
_userPreference = [NSUserDefaults standardUserDefaults];
}
if (![_userPreference floatForKey:#"scale"]) {
// if user has not entered this info yet
// also 0 is not a valid value so I can do this
[_userPreference setFloat:100.0 forKey:#"scale"]; // let default scale be 100.0
[_userPreference synchronize];
}
However, when I later on query this, no matter what I set in the default value, the following command:
[self.userPreference floatForKey:#"scale"];
always return 1. I am not sure what is happening. Am I not creating the NSUserDefaults correctly?
Thank you in advance!
if you want to use NSUserDefaults, do not create any variables or #propertys. Just use
[[NSUserDefaults standardUserDefaults] setFloat:forKey:]
[[NSUserDefaults standardUserDefaults] synchronize];
to save your data and
[[NSUserDefaults standardUserDefaults] floatForKey:]
for fetching data.
Store using
[_userPreference setObject:[NSNumber numberWithFloat:100.0] forKey:#"Scale"];
[_userPreference synchronize];
and retrieve it using
float value = [[_userPreference objectForKey:#"Scale"] floatValue];
Have you tried this to set the float value:
[_userPreference setObject:[NSNumber numberWithFloat:100.0f] forKey#"scale"];
and the following to retrieve:
CGFloat scale = [[_userPreference objectForKey#"scale"] floatValue];
Change your if condition to this:
if ([_userPreference floatForKey:#"scale"] == 0.0f ) {
NSUserDefaults will always return 0.0f if no value is set for the key. Since you are saying that "also 0 is not a valid", you can safely use this approach
try this
-(void) saveFloatToUserDefaults:(float)x forKey:(NSString *)key {
NSUserDefaults * userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setFloat:x forKey:key];
[userDefaults synchronize];
}
-(float) retriveFromUserDefaultsForKey:(NSString *)key {
NSUserDefaults * userDefaults = [NSUserDefaults standardUserDefaults];
return [userDefaults floatForKey:key];
}
[self saveFloatToUserDefaults:6.55 forKey:#"myFloat"];
float x = [self retriveFromUserDefaultsForKey:#"myFloat"];
Hi I am using uislider and get the values in label. now i try to save the slider values. I don't know how to do this. If anybody knows please share the code. This is my code for slider changed.
-(IBAction)sliderChanged:(id)sender
{
UISlider *slider = (UISlider *)sender;
if((int)slider.value % 10 == 0)
{
sliderLabel.text = [[NSString alloc] initWithFormat:#"Value of:%d", (int)slider.value];
}
}
You can use NSUserDefault for storing the slider value.
NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:sliderLabel.text forKey:#"Slider"];
[defaults synchronize];
You can retrieve the data like:
NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
NSString *strValue = [defaults objectForKey:#"Slider"];
myLabel.text = strValue != nil ? strValue : #"No Value";
The above code is saving the sliderLabel to the NSUserDefault. If you want to store the slider value in the form of float then use:
[defaults setObject:[NSNumber numberWithFloat:slider.value] forKey:#"Slider"];
Retreive it like:
NSNumber *strValue = [defaults objectForKey:#"Slider"];
NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:[NSNumber numberWithFloat:slider.value] forKey:#"sliderValue"];
I believe you should store the value as a float (the original type for a UISlider value), it's just cleaner, and you'll probably want to reuse the float value to set back your slider when reopening the screen with something like:
NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
[self.slider setValue:[[defaults objectForKey#"sliderValue"] floatValue]];
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];