This is the most simple solution I’ve found: //–Init int myvar = 12; //–SAVE Data SharedPreferences preferences = context.getSharedPreferences(“MyPreferences”, Context.MODE_PRIVATE); SharedPreferences.Editor editor = preferences.edit(); editor.putInt(“var1”, myvar); editor.commit(); //–READ data myvar = preferences.getInt(“var1”, 0); Where ‘context’ is the current context (e.g. in an activity subclass could be this).
Yes, both lines of code are equivalent, both will result in nil read id obj = [[NSUserDefaults standardUserDefaults] objectForKey:@”example key”]; NSUserDefaults will return nil if the key was not found. I would recommend to use the removeObjectForKey instead of setting it to nil. here is how to test if setting key value to nil removed … Read more
I found out one alternative, before save, I encode the root object (NSArray object) using NSKeyedArchiver, which ends with NSData. Then use UserDefaults save the NSData. When I need the data, I read out the NSData, and use NSKeyedUnarchiver to convert NSData back to the object. It is a little cumbersome, because i need to … Read more
ref: NSUserdefault objectTypes Swift 3 and above Store UserDefaults.standard.set(true, forKey: “Key”) //Bool UserDefaults.standard.set(1, forKey: “Key”) //Integer UserDefaults.standard.set(“TEST”, forKey: “Key”) //setObject Retrieve UserDefaults.standard.bool(forKey: “Key”) UserDefaults.standard.integer(forKey: “Key”) UserDefaults.standard.string(forKey: “Key”) Remove UserDefaults.standard.removeObject(forKey: “Key”) Remove all Keys if let appDomain = Bundle.main.bundleIdentifier { UserDefaults.standard.removePersistentDomain(forName: appDomain) } Swift 2 and below Store NSUserDefaults.standardUserDefaults().setObject(newValue, forKey: “yourkey”) NSUserDefaults.standardUserDefaults().synchronize() Retrieve var returnValue: [NSString]? … Read more
You are needlessly complicating things. Why are you converting the date to a time interval (then the time interval to a different primitive)? Just [sharedDefaults setObject:theDate forKey:@”theDateKey”] and be done with it. NSDate is one of the “main types” supported by the PLIST format (dates, numbers, strings, data, dictionaries, and arrays), so you can just … Read more
The simplest solution for storing a few strings or common types is UserDefaults. The UserDefaults class provides convenience methods for accessing common types such as floats, doubles, integers, Boolean values, and URLs. UserDefaults lets us store objects against a key of our choice, It’s a good idea to store these keys somewhere accessible so we … Read more
The code you posted tries to save an array of custom objects to NSUserDefaults. You can’t do that. Implementing the NSCoding methods doesn’t help. You can only store things like NSArray, NSDictionary, NSString, NSData, NSNumber, and NSDate in NSUserDefaults. You need to convert the object to NSData (like you have in some of the code) … Read more
objectForKey: will return nil if it doesn’t exist.
NSString *valueToSave = @”someValue”; [[NSUserDefaults standardUserDefaults] setObject:valueToSave forKey:@”preferenceName”]; [[NSUserDefaults standardUserDefaults] synchronize]; to get it back later NSString *savedValue = [[NSUserDefaults standardUserDefaults] stringForKey:@”preferenceName”];
You can print all current NSUserDefaults to the log: Just keys: NSLog(@”%@”, [[[NSUserDefaults standardUserDefaults] dictionaryRepresentation] allKeys]); Keys and values: NSLog(@”%@”, [[NSUserDefaults standardUserDefaults] dictionaryRepresentation]);