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#Save dictionary array in user defaults swift how to#
#Save dictionary array in user defaults swift full#

Let bookiesData = try! PropertyListEncoder().encode(bookies) Once the struct is Codable, you can convert one of them, or even an array of them, into a property list via JSONEncoder or PropertyListEncoder: import Foundationīookie(name: "mbro12", nameId: "id1", bookId: "b1", picture: Data()),īookie(name: "mayoff", nameId: "id2", bookId: "b2", picture: Data())

If all of the struct's stored properties conform to Codable, then you can ask Swift to generate everything needed to make the struct itself conform to Codable just by declaring the conformance.

One way is to stop using a tuple and use a struct instead. A Data is a property list, and there are several ways to convert things to Data. The values in UserDefaults must be property lists, so you need to convert each tuple to a property list.

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#Save dictionary array in user defaults swift how to#

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#Save dictionary array in user defaults swift full#

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This means you can either accept the optionality, or typecast it to a non-optional type and use the nil coalescing operator to handle missing values. When retrieving objects, the result is optional. Let useTouchID = defaults.bool(forKey: "UseTouchID") With that in mind, you can read values back like this: let age = defaults.integer(forKey: "Age")

object(forKey:) returns AnyObject? so you need to conditionally typecast it to your data type.

double(forKey:) returns a double if the key existed, or 0.0 if not.

float(forKey:) returns a float if the key existed, or 0.0 if not.

bool(forKey:) returns a boolean if the key existed, or false if not.integer(forKey:) returns an integer if the key existed, or 0 if not.You need to know what these default values are so that you don't confuse them with real values that you set. When it comes to reading data back, it's still easy but has an important proviso: UserDefaults will return a default value if the setting can't be found. As an advance warning, you might find some old tutorials recommend calling the synchronize() method to force your data to save, but Apple has asked us not to do that for some years now.Īs mentioned, you can use UserDefaults to store arrays and dictionaries, like this: let array = ĭt(array, forKey: "SavedArray") When you set values like that, they become permanent – you can quit the app then re-launch and they'll still be there, so it's the ideal way to store app configuration data. Here's an example of setting some values: let defaults = UserDefaults.standardĭt("Paul Hudson", forKey: "Name")ĭt(Date.now, forKey: "LastRun") This system, called UserDefaults can save integers, booleans, strings, arrays, dictionaries, dates and more, but you should be careful not to save too much data because it will slow the launch of your app. All iOS apps have a built in data dictionary that stores small amounts of user settings for as long as the app is installed.