Xcode

When using Xcode 11 to create a new iOS project, if you still create the root view controller in AppDelegate class’s – func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool function as usual, you will find there is a compile time error which said Value of type ‘AppDelegate’ has no member ‘window’. And […]

When you develop an iOS app, you sometimes need to simulate memory warning notifications to test your iOS app in high memory pressure conditions. Xcode simulator just provides such a tool for you to trigger memory warning notifications. Then you can test your source code in ViewController class’s didReceiveMemoryWarning function. This article will tell you

When you develop an iOS app, you may need to add some resource files ( such as image files, audio files, data files, etc) into it. And when you installed an iOS app binary file, you can open it in the macOS finder by right click the app binary file then click the Show Package

Xcode build directory is used to save iOS app binary files when you build your Xcode app. Xcode provides you several ways to specify the build output directory location. It can be a unique subfolder or a shared subfolder in Xcode derived data directory ( in this case all the Xcode projects use one build

When I use Xcode 10.3 to open an old Xcode project, I encounter the below error messages. The error message said unable to log in with the current apple account, and no profiles for the project were found. You can find the error message by clicking the project name in the Xcode project left side

Xcode uses workspace and projects to manage swift source code. When you develop an iOS app, you should first create a workspace, and then create and add a new project into it. You can also add existing projects into the Xcode workspace. This article will tell you how to do it.

After you create a swift project in Xcode and write some swift source code, you must want to debug your iOS app to help you to find out and fix errors that exist in your app. Debug and find error messages in Xcode is very easy, this article will tell you how to do it.

This article will tell you what is Xcode Library, Assistant Editor, and Inspector. It will also tell you how to display Xcode Library, Assistant Editor, and Inspector window when you need them. Because for Xcode beginners, you may find you can not find them at some time.