如何在 iPhone 模拟器中重置 NSUserDefaults 数据？

Question

I've added NSUserDefaults data retrieval to my app, which is pretty nice. But for testing I would like to reset all the data I added to the defaults database, so that everything is in the state when the user launches the app the first time.

I tried to call:

[NSUserDefaults resetStandardUserDefaults];

but that doesn't do anything. The defaults are still saved and can be retrieved.

Answer 1

You want NSUserDefaults removePersistentDomainForName . This will remove all user defaults for the application:

NSString *appDomain = [[NSBundle mainBundle] bundleIdentifier];
[[NSUserDefaults standardUserDefaults] removePersistentDomainForName:appDomain];

For more information on the NSUserDefaults class see the Apple docs .

Alternately, if all you are concerned with is data in the iOS Simulator, you can do that via iOS Simulator > Reset Content and Settings .

Answer 2

The easiest way is to remove the app from the simulator-- just like you'd remove it from a real phone, by tapping (clicking) and holding until the icons start vibrating. That removes all app data, and the next time you install from Xcode it's like the first time.

If you have other app data you need to keep, you have a couple of options.

One way would be to have some debug code that calls removeObjectForKey: on each of your defaults keys.

The other is to find the directory where the simulator copy is installed, and remove the file containing the preferences. Use this to find the app:

ls -ld ~/Library/Application\ Support/iPhone\ Simulator/User/Applications/*/*.app

The full path to your app will contain directory whose name is a UUID. In that directory, look in Library/Preferences for the preferences file. Remove that, and user preferences are gone.

Answer 3

您可能会发现您为应用程序的用户默认设置“写入”的内容都在文件中，删除此 .plist 文件有效：

user name/Library/Preferences/com.theAppYouAreHandling.plist

Answer 4

在 Swift 2.0 中，以下 1 行将重置应用程序的所有 NSUserDefaults：

NSUserDefaults.standardUserDefaults().removePersistentDomainForName(NSBundle.mainBundle().bundleIdentifier!)

Answer 5

实际上，这可能并不适用于所有情况，但由于我在模拟器中没有保留任何有价值的信息，我只是从模拟器本身的 iPhone 菜单中重置内容和设置。

Answer 6

Til Xcode 6 and iOS 8 Simulator the location of the plist file changed.

I found the *.plist in the following directory:

[1] /Users/SOME-USERNAME/Library/Developer/CoreSimulator/Devices/SOME-DEVICE-ID/data/Library/Preferences/SP.UserDefaultsTest.plist

Deleting the located file from path [1] manually and the NSUserDefaults are gone.

Answer 7

Here's the swift version:

let domainName = NSBundle.mainBundle().bundleIdentifier!       
NSUserDefaults.standardUserDefaults().removePersistentDomainForName(domainName)

Answer 8

在模拟器顶部菜单中：

Simulator -> Reset Content and Settings...

Answer 9

You can use removePersistentDomainForName method available with NSUserDefaults Class.

Syntax :

- (void)removePersistentDomainForName:(NSString *)domainName

Example :

NSString *strAppBundleId = [[NSBundle mainBundle] bundleIdentifier];
[[NSUserDefaults standardUserDefaults] removePersistentDomainForName:strAppBundleId];

Answer 10

If you're doing this in a unittest, you may want to keep the state of your app in the current simulator instead of inadvertently wiping it every time you also run your unittests. One way to do this is to simply hang on to the old values for your app domain in setUp() and then restore them in tearDown() :

class MyClass_Tests: XCTestCase {
    static let domainName = Bundle.main.bundleIdentifier!
    static var oldUserDefaults: [String : Any]?

    override class func setUp() {
        super.setUp()
        // Hang onto this so we don't inadvertently wipe the app's state while running tests.
        oldUserDefaults = UserDefaults.standard.persistentDomain(forName: domainName)
    }

    override class func tearDown() {
        // Restore the old values.
        UserDefaults.standard.setPersistentDomain(oldUserDefaults!, forName: domainName)
        super.tearDown()
    }

    override func setUp() {
        super.setUp()
        // Wipe the state for each test.
        UserDefaults.standard.removePersistentDomain(forName: MyClass_Tests.domainName)
    }

    override func tearDown() {
        super.tearDown()
    }
}