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I check other questions in the stack overflow, however, the problem is I really download some sqliteBrowser, and can not find my project sqlite. Somebody told me that the path is "/Users/My_Name/Libray/Developer/CoreSimulator/Devices".

I find some many folders in the Devices, but which one is my project belongs to? All the folder's name is like "9EF3A7FD-5F1E-4134-A602-307739CEEE07", I was so confused.

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You can debugPrint the path where the sqlite file is created in your AppDelegate if you are using the default template from xcode, you will find the line

let url = self.applicationDocumentsDirectory.URLByAppendingPathComponent("Whatever.sqlite")

put a

debugPrint(url)

after that and let the simulator tell you where to look.

The directories' names are UUIDs representing the different simulator instances you have been using over time.

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I add "debugPrint(url)" in my AppDelegate, however, I didn't see the output in the console?
My bad; I assumed you were actually using core data. The store is initialized lazily. As soon as you use Core Data features in the app, it should pop up. As a quick workaround, add debugPrint(self.persistentStoreCoordinator) in application:didFinishLaunchingWithOptions:.
Thank you so much! You really solve me my headache problem!!
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In Swift 3, I add this print statement:

print(container.persistentStoreDescriptions)

inside the lazy declaration of persistentContainer, right before returning the container. 

lazy var persistentContainer: NSPersistentContainer = { let container = NSPersistentContainer(name: "App_Name") container.loadPersistentStores(completionHandler: { (storeDescription, error) in if let error = error as NSError? { fatalError("Unresolved error \(error), \(error.userInfo)") } }) print(container.persistentStoreDescriptions) return container }()
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