I am assuming an array, but it will work with dictionaries too. Userdefaults, Core Data and Plists can all be read/write but if you use a plist you need to pay attention in what dir you put it. See the plist part down below. Core Data I think it’s way too much overkill, it’s just … Read more
Swift 5.2 or later Note that this will save only the RGBA CGFloat values as Data inside the property list. This will use 32 bytes (raw data) instead of 424 bytes needed when using the standard approach with NSKeyedUnarchiver (NSCoding): extension Numeric { var data: Data { var bytes = self return Data(bytes: &bytes, count: … Read more
I try to write a quick and simple list of common use cases, because as @rmaddy says this answer could fill a book chapter: NSUserDefaults: stores simple user preferences, nothing too complex or secure. If your app has a setting page with a few switches, you could save the data here. Keychain (see SSKeychain for … Read more
The following code should help you resolve your problem: import UIKit class ViewController: UIViewController { var food: [String] { get { if let returnValue = NSUserDefaults.standardUserDefaults().objectForKey(“food”) as? [String] { return returnValue } else { return [“muesli”, “banana”] //Default value } } set { NSUserDefaults.standardUserDefaults().setObject(newValue, forKey: “food”) NSUserDefaults.standardUserDefaults().synchronize() } } override func viewDidLoad() { super.viewDidLoad() print(food) … Read more
You can use these rules of thumb to decide what storage model will work for your app. If the data fits in memory entirely and is relatively unstructured, use plist If the data fits in memory entirely and has tree-like structure, use XML If the data does not fit in memory and has a structure … Read more
The difference is that the first code-snippet you register defaults that will be used when the user has not made any changes to the “property”. So if you want to provide let’s say a “property” with the key name ‘Welcome message’, you could instead of having the property returning nil insert a default message ‘Welcome … Read more
If you have a look at the NSUserDefaults documentation you will see a method – (NSDictionary *) dictionaryRepresentation. Using this method on the standard user defaults, you can get a list of all keys in the user defaults. You can then use this to clear the user defaults: – (void)resetDefaults { NSUserDefaults * defs = … Read more
With watch OS2 you can no longer use shared group containers. Apple Docs: Watch apps that shared data with their iOS apps using a shared group container must be redesigned to handle data differently. In watchOS 2, each process must manage its own copy of any shared data in the local container directory. For data … Read more
If you terminate your app by pressing the home button (in the Simulator or on the device), your NSUserDefaults will get saved. If you terminate your app by pressing “Stop” in Xcode (in the Simulator or on the device), your NSUserDefaults might get saved, but there’s a good chance they won’t. NSUserDefaults persists any changes … 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