I've made a simple save and load app for contacts (first name, second name and phone number) using NSUserDefaults but i need to show this information in a scroll view. could someone please guide me how to do this? code for each IBAction is this:
//this is to save a contact - where does it go? trying to figure that out...
- (IBAction)save:(id)sender {
NSString*saveString = firstName.text;
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:saveString forKey:#"saveString"];
[defaults synchronize];
this is to load the last contact that was saved. where does it load from, i don't know. how to add to it dynamically, need to figure that out. how to log everything on a UIScrollView, pls advise!
- (IBAction)load:(id)sender {
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSString *loadString = [defaults objectForKey:#"saveString"];
[firstName setText:loadString];
NSLog(#"%#", theArray);
basically i need to make a simple phoneBook app for class and make the contact show up as a button on a scroll view once saved. everything works fine except for making contact show up as a button!
Related
I have a check box type application, kinda like notes on the iPhone. When the user closes the application and double tabs the home button and deletes the application from the background, the things they have typed also get deleted or reset. I was thinking of calling
[self saveContext];
But that didn't work. WHat should I be calling?
You can usual use something such as NSUserDefaults to save information. Or, you can go another route and save the information in a data structure and write that to a file. There are many easy ways of doing this. For instance, if you want to preserve a checked value, you could do the following:
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setBool:YES forKey:"checked"];
[defaults synchronize];
Very simple, and then can be queried across app exits, like so:
if( [defaults boolForKey:"checked"] ) {
//do stuff here
}
i have been working on a app, and needed to store a string. I used this code to set the default:
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setValue:CertificateKey.stringValue forKey:#"SavedKey"];
[[NSUserDefaults standardUserDefaults] synchronize];
NSLog(#"%#",[defaults objectForKey:#"SavedKey"]);
I loged it, so i know it saved...well, it showed me the value.
When i open my application, I use this to retrieve the default:
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[CertificateKey setStringValue:[defaults objectForKey:#"SavedKey"]];
[CertificateKey setTitleWithMnemonic:[defaults objectForKey:#"SavedKey"]];
[[NSUserDefaults standardUserDefaults] synchronize];
Why will it not get the default value? Did i not completely save it?
Don't quit the application by pressing the stop button in xcode. Instead, quit it by right clicking on the application icon and selecting "Quit".
Edit
Maybe the first time that you execute the application, you want to save some defaults but you don't want to set them the second+ time that the application runs.
For this purpose in some class initialize method register the defaults, like this:
+ (void) initialize
{
NSUserDefaults* defaults= [NSUserDefaults standardUserDefaults];
[defaults registerDefaults: #{} ];
// This case it's an empty dictionary, but you can put whatever you want inside it.
// just convert it to data if it's not an object storable to a plist file.
}
Also, you're using setValue:forKey: , that method is inherited from NSObject. Use setObject:forKey: .
And use finalize if you want to save the defaults at the end:
- (void) finalize
{
// Save the defaults here
}
You might have a problem because you are creating an instance of NSUserDefaults. From what I understand you are supposed to access it like so: [[NSUserDefaults standardUserDefaults] setValue:#"Pikachu" forKey:#"Best Pokemon Ever"]; [[NSUserDefaults standardDefaults] objectForKey:#"Best Pokemon Ever"]; Rather than actually creating an instance of it.
This is supposed to save the value of two UISwitches to NSUserDefaults and then set the switches on load based on the values saved to the defaults. I've been at this for hours but I can't seem to get it to work. Any help would be greatly appreciated.
The toggles are in a View that I'm using for settings. There are only two toggles, so I want to use NSUserDefaults. Toggles default to OFF. I want to toggle to ON and have that change be saved so that I can change the User experience based on the toggle's value. Then, when the User opens the settings again, I want them to display their current saved state.
I think that the value is being saved, but it is not being applied to the Switches when I reenter the Settings View.
- (IBAction)setBeadVibratorBySwitchState:(id)sender
{
if (setBeadVibrator.selected == YES) {
NSUserDefaults *beadSettings = [NSUserDefaults standardUserDefaults];
[beadSettings setBool:NO forKey:#"beadSwitchStatus"];
[beadSettings synchronize];
}
if (setBeadVibrator.selected == NO) {
NSUserDefaults *beadSettings = [NSUserDefaults standardUserDefaults];
[beadSettings setBool:YES forKey:#"beadSwitchStatus"];
[beadSettings synchronize];
}
NSLog(#"Bead Executed");
}
- (IBAction)setDecadeVibratorBySwitchState:(id)sender
{
if (setDecadeVibrator.selected == YES) {
NSUserDefaults *decadeSettings = [NSUserDefaults standardUserDefaults];
[decadeSettings setBool:NO forKey:#"decadeSwitchStatus"];
[decadeSettings synchronize];
}
if (setDecadeVibrator.selected == NO){
NSUserDefaults *decadeSettings = [NSUserDefaults standardUserDefaults];
[decadeSettings setBool:YES forKey:#"decadeSwitchStatus"];
[decadeSettings synchronize];
}
NSLog(#"Decade Executed");
}
- (void)viewDidLoad
{
[super viewDidLoad];
setBeadVibrator.selected = [[NSUserDefaults standardUserDefaults] boolForKey:#"beadSwitchStatus"];
setDecadeVibrator.selected = [[NSUserDefaults standardUserDefaults] boolForKey:#"decadeSwitchStatus"];
}
NSUserDefaults can only store objects of type NSData, NSString, NSNumber, NSDate, NSArray, or NSDictionary. So, I suggest that you put the state of the switch in an NSString and put that string in the NSUserDefaults. Than when you retrieve the info from the NSUserDefaults, you can use an if statement to set the value of the boolean again.
If you are using UISwitch, you should set the on property, instead of selected.
setBeadVibrator.on = [[NSUserDefaults standardUserDefaults] boolForKey:#"beadSwitchStatus"];
setDecadeVibrator.on = [[NSUserDefaults standardUserDefaults] boolForKey:#"decadeSwitchStatus"];
see UISwitch Class Reference
I would suggest that you put the NSLog statements in the if-statements to see if they are really saved. If not, your UISwitches may not be configured properly with the UIControlEventValueChanged event.
You can read up more from Apple doc. Here is a very detailed website on using UISwitches.
I'm having trouble getting some informations written in my .plist, and NSUser Defaults Files.
For the .plist i've already posted but, nothing seems to be wrong:
How to update an array set into the .plist dictionary
And for the NSUser Default, i'm doing something like this:
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSMutableArray *userSettings = [[NSMutableArray alloc]initWithArray:[[defaults objectForKey:#"userSettings"]mutableCopy]];
[userSettings addObject:userSettingsArray];//adding an array into my userSettingsArray (declared higher in the code)
[defaults setValue:userSettings forKey:#"userSettings"];
[defaults synchronize];
I was wandering, is there any option in Xcode allowing , or not, the user to write into the app folders?
I'm a little stuck here
Thank you for your help,
Tim
Use
[defaults setObject:userSettings forKey:#"userSettings"];
instead of
[defaults setValue:userSettings forKey:#"userSettings"];
I found the solution to my problem:
I entered the datas from the IBOutlet like this
[self.tempUserSettings insertObject:self.firstName atIndex:1];
instead of this:
[self.tempUserSettings insertObject:self.firstName.text atIndex:1];
so the datas were wrong, and so and so.....
Thank you for you help, learned a lot from those .plist and NSUserDefault
I'm having a problem with NSUserDefaults. I'm saving a name, then trying to access it later in the code from another view controller, but it seems that my key is empty or not saved as when I display the string from the key my label is blank.
-(void) saveName {
NSString *name = nameField.text;
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:name forKey:#"playersName"];
[defaults synchronize];
}
-(void) viewDidLoad // method called later on in code from different viewcontroller
{
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSString *name = [defaults objectForKey:#"playersName"];
playerName.text = name; // player name == myLabel
if ([[NSUsersDefaults standardUserDefaults] objectForKey:#"playersName"] == nil) {
playerName.text =#" blank";
}
}
My string doesn't seem to be saving to userdefaults as the #"blank" string keeps showing up with my label. I'm not too familiar with NSUserDefaults so any help is much appreciated.
A few things to note when using NSUserDefaults:
calls to syncrhonize method is not necesary and will only make it slower if your program is multi threaded.
Check if the key that you use is being used by other libraries in your project
Check if the value that you set to the key is not nil
Try to use stringForKey: or boolForKey: instead of objectForKey:
I had troubles a few times with NSUserDefaults but in the end it's usually my code that's problematic.
I would suggest you to check whether your '(void) saveName' method is being called or not... Put some breakpoint and see the result