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What can you store in UserDefaults?
You can use UserDefaults to store any basic data type for as long as the app is installed. You can write basic types such as Bool , Float , Double , Int , String , or URL , but you can also write more complex types such as arrays, dictionaries and Date – and even Data values.
Where are the NSUserDefaults values stored?
All the contents saved by NSUserDefaults is saved inside a plist file that can be found under Library -> Preferences -> $AppBundleId.
Are UserDefaults thread safe?
The UserDefaults class is thread-safe.
What is plist in Swift?
A property list, commonly abbreviated as plist, is an XML file that contains basic key-value data. You can use a plist in your iOS apps as a simple key-value data store.
What is NSDictionary?
The NSDictionary class declares the programmatic interface to objects that manage immutable associations of keys and values. Each entry consists of one object that represents the key and a second object that is that key’s value. Within a dictionary, the keys are unique.
How much data we can store in UserDefaults?
extension UserDefaults { /*! NSUserDefaultsSizeLimitExceededNotification is posted on the main queue when more data is stored in user defaults than is allowed. Currently there is no limit for local user defaults except on tvOS, where a warning notification will be posted at 512kB, and the process terminated at 1MB.
Is NSFileManager thread safe?
Instances ofNSFileManager are considered thread-safe when created using [[NSFileManager alloc] init]. This means that if your application ends up using the NSFileManager singleton from more than one thread you may get some unexpected results or even end up with corrupted files in your file system.
What is PlistBuddy?
DESCRIPTION. The PlistBuddy command is used to read and modify values inside of a plist. Unless specified by the -c switch, PlistBuddy runs in interactive mode. The following commands are used to manipulate plist data: Help Prints this information. Exit Exits the program.
How are user defaults stored in nsuserdefaults?
Provides access to the user defaults. There are two kinds of user defaults, persistent and volatile. Persistent user defaults are stored after you make changes to them, while volatile settings are transient, they might be created on demand, and will cease existence when the application terminates or the object is disposes.
What are the methods of nsuserdefaults in Apple?
The NSUserDefaults class provides convenience methods for accessing common types such as floats, doubles, integers, Boolean values, and URLs. These methods are described in Setting Default Values.
What does nsuserdefaults do on an iPhone?
The NSUserDefaults class provides a programmatic interface for interacting with the defaults system. The defaults system allows an app to customize its behavior to match a user’s preferences. For example, you can allow users to specify their preferred units of measurement or media playback speed.