User defaults swift 3 update how to#
User defaults swift 3 update code#

We could further improve the solution by adding convenience properties for each of the settings, but that is beyond the scope of this post. The second print statement confirms that the reset() method works as expected. We then invoke the reset() method to clear the user's defaults database. The first print statement confirms that this works. We use the Keys enum to set the value of the allowDownloadsOverCellular key to true. Run the contents of the playground and inspect the output in the console. We invoke the removeObject(forKey:) method on the UserDefaults instance, passing in the raw value of the case.

We use the forEach(_:) method to loop over the array of cases. We ask the Keys enum for the array of cases using the allCases computed property. The implementation requires a single line of code. With the Keys enum in place, we can implement an instance method with name reset(). This computed property returns an array that includes every case the Keys enum defines. Why is this necessary? If we conform the Keys enum to the CaseIterable protocol, a computed property with name allCases automatically becomes available. First, Inset Grouped tableViews have additional alignment properties If you use. We conform the Keys enum to the CaseIterable protocol. The Keys enum manages the keys used to store data in the user's defaults database. For example, with a Interface Builder binding. The default value is written to the actual UserDefaults and can be used elsewhere.

In the extension, we create a enum with name Keys and String as the raw value. Key< T > ( name: String, default: T, suite: UserDefaults.

We start by defining an extension for the UserDefaults class. There are several solutions to accomplish this. For that to work, you need to carefully keep track of the data you store in the user's defaults database. The removeObject(forKey:) method also works fine if you need to remove multiple key-value pairs. The output in the console confirms that the removeObject(forKey:) method works as advertised. To remove a key-value pair from the user's defaults database, you need to invoke removeObject(forKey:) on the UserDefaults instance. It doesn't clear or reset the user's defaults database. The output in the console confirms that the resetStandardUserDefaults() method has no effect.

User defaults swift 3 update code#

Create a playground, add the following code snippet, and run the contents of the playground. The description of the method says 'This method has no effect and shouldn't be used.' Let's put that to the test. The method is named resetStandardUserDefaults(). The documentation of the UserDefaults class lists a method in the Legacy section that seems to do the trick.

What options do you have to reset the user's defaults database in Swift? Reset Standard User Defaults Wraps platform-specific persistent storage for simple data (NSUserDefaults on iOS and macOS, SharedPreferences on Android, etc.). How do you clear the user's defaults database? The UserDefaults class doesn't offer this functionality. Depending on its permissions, an authorized app may be able to obtain information from and use your account in various ways, such as reading your Tweets, seeing. But UserDefaults was written for NSString and friends all of which are 100 interchangeable with Swift their equivalents which is why this code works. From time to time, however, you need to perform a task that is less trivial. I'm rewriting parts of an app, and found this code: fileprivate let defaults = UserDefaults.The UserDefaults class has a fairly extensive API that should meet most of your needs. What is the iPhone's default keyboard animation rate?.How is a rounded rect view with transparency done on iphone?.

User defaults swift 3 update how to#

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But when I try to pull the value back from UserDefaults, it's 0.0. I have gone through and printed each variable individually to make sure they all have data and all the way to latestBottle everything is fine.

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