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How to quit cocoa app when window close using swift This code is tested on xcode 8.2 with swift 3.0.1 on macbook pro running MacOS Sierra 10.12.2. Handing it needs three steps. Arguments are not case sensitive. Arguments with spaces should be quoted. Options: -a Match argument string with any of the application's name, displayed name, short name, or title. E.g.: `quit 'microsoft word'` and `quit -a word` will both quit Microsoft Word, because the app calls itself 'Word' in the menu bar. Making a Quit app in SwiftUI noob edition. Open source projects and anything else related to iOS, macOS, watchOS, or tvOS development. Swift or Objective-C. The macOS is popular for its seamless operations and simple but it also has some issues which every OS ever has frozen apps. Yes, macOS also get stuck sometimes when the app freezes. If it even happened to you then here is a quick guide to tell you how you can force quit those apps. How to fix overheating issue on Mac. Using Apple Menu. How to Quit Apps in macOS. If you want to actually close an application, click File Quit in the menu bar, or press Cmd+Q while using the application. It’s that simple. It will take a bit of getting used to at first, but soon this will become second nature. Alternatively, you can right-click its dock icon, then click “Quit”.

In this article, I would like to showcase the basics of iOS data persistence with Swift, by presenting a general overview of what’s possible. Data persistence is the mechanism of storing any type of data to disk so that the same data can be retrieved without being altered when the user opens the app next time. While you could save the same data on a server, in this tutorial we are going to describe all the ways to store data locally in iOS apps.

For example, we are saving to disk all the stocks & cryptocurrencies in your watchlist, for our Finance App Template. We are using NSUserDefaults to persist the users’ settings in all of our templates.

By default, all the variables and constants that you allocate in Swift are stored in memory, so they get lost when users quit the app. Different types of data can be saved to the device locally, using different tools (Swift APIs). To achieve that in Swift that we can use the following technologies (Swift APIs):

UserDefaults
Keychain
Saving files to disk
Core Data
SQLite
Property Lists

In this article, we are going to describe in details these Swift technologies, as well as how to pick the the one that best fits your needs. All of them have powerful benefits, but they come with different trade offs, so it can be tricky to choose the right one, especially if you’re new to iOS.

UserDefaults

UserDefaults as name specific can be used to store default information about the application or its users. For example, the user should be able to specify the default playback speed or currency that you should display when presenting some stock data. These preferences should be application specific and should be persistent between app launches.

UserDefaults is an NSObject subclass that gives us synchronous reads and writes (on cache level) and asynchronous persistence level.

UserDefaults Example

Advantages

UserDefaults is easy to use, with a simple API
Thread safe (you can read and write values from any thread), without worrying about synchronization
UserDefaults is shared between the app and the app extensions

Limitations

It is possible to easily override the value for this same key (key collisions)
UserDefaults is not encrypted
Unit testing user defaults can occur with some false positives.
UserDefaults can be altered globally, from anywhere in the app, so you can run in inconsistent states easily

Keychain

Apple Keychain is a very popular and functional Swift tool that every iOS and MacOS user is using. It can be used to save passwords, secure notes, certificates, etc. In general, Keychain is an encrypted database with quite a complicated and robust API.

Use Keychain when you need to save sensitive user data, such as passwords or login credentials. For example, we are using Keychain to implement the persistent login feature in all of our Swift App Templates.

On the following Swift snippet, we can see a simple query that allows reading a password from Keychain for a given account, inside a given service: Isight app for mac.

Saving passwords is even more complicated as the native Keychain API does not distinguish between adding an item and updating an item. Taking into consideration all that stuff, in general, it’s a good idea to use some external libraries with some handy APIs like Locksmith or KeychainAccess for that purpose.

Advantages

All items saved in keychain are encrypted (Keychain is the most secure data persistence layer in iOS)
There is a lot of open source wrappers with user-friendly Swift APIs
Once again security
Thread safety

Limitations

There is no handy and old-fashioned Keychain API, so you usually end up depending on an open-source project
Hard to unit test, unless you create your own wrapper around it
Speed: Reading or saving a lot of information into Keychain can be slow
Not recommended for storing large objects

Swift Macos App

CoreData

Age of empires iii for mac. CoreData is persistence and/or in-memory cache framework that consists of a very powerful set of other tools that can be used within the app. In most common examples CoreData is used as a wrapper for the SQLite database and it’s used to save and present any type of user data.

Functionalities

Query-free SQL database wrapper
Easy to read data on the main thread
Easy to use background thread data saving
Easy to setup in-memory database (e.g. for caching, or unit testing)
Out of the box support for automatic migrations of the database between app releases
Easy to setup database modeling tool (with Interface Builder)

Core Data Example

To setup CoreData in the app, we need to do the following steps:

Create DataModel object
Create Entities inside the DataModel tool
Create CoreData stack
Fetch NSManagedObjectContext

Let’s create a DataModel. Apple recommends using the application name as DataModel name.

Now, we can create a CoreData stack. The stack should store NSPersistentContainer, and give access to mainContext (which is a NSManagedObjectContext object) – this one should be used for fetching the data and to create background contexts which are responsible for saving the data.

Loading an array of pills:

To save a new Pill entity, we need to perform the following steps:

context.perform is a requirement for being thread-safe because all operations of the given context need to be performed on the context queue.
let entity = Pill.entity() is creating the entity, which is required to create an empty database row
Then we can create a Pill object Pill(entity: entity, insertInto: context)
last, but not least, try context.save is saving the context and informing other contexts that database changes were performed

Core Data Advantages

CoreData is simple to set up and use
Lots of additional tools provided by Apple for fetching data (https://developer.apple.com/documentation/coredata/nsfetchedresultscontroller)
Speed & Performance: Possibility to be a cache when setup `in memory `
Out-of-the-box database migrations (simple one)

Core Data Limitations

Quite advanced threading policy
Being fo

Macos Quit App Swift