When you develop an iOS app use swift in Xcode, the project template commonly creates a default UIViewController class defined in ViewController.swift file. This UIViewController class is used as a controller of the MVC pattern to respond to the app’s main window view’s event.
How To Present / Dismiss UIView Controller Programmatically In Swift Read More »
If you are a beginner of iOS swift programming, you may be confused by some strange swift operator, such as _, !, ?, ??. This article will tell you what dose those strange swift operator means one by one.
What Does Operator _ , ! , ? , ?? Means In Swift Read More »
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
How To Simulate Memory Warning In Xcode 10 iOS Simulator Read More »
When you develop an iOS app, you may want your app to support iPhone, iPad only, or support both of them. And in some cases, if your UI layout is very complex, you can make your iOS app layout fixed by showing the app only in one orientation ( for example Portrait or Landscape orientation
How To Set iOS App Supported Devices And Orientation In Xcode Target Or Programmatically Read More »
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
How To Add Resource Files Into Xcode Project And iOS App Read More »
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
How To Configure Xcode Default, Workspace, Project Build Directory Location Read More »
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
After I upgrade my Xcode to version 10.3, I found all the iOS simulators which I used before have lost. And when I build or run the iOS app in Xcode, it will use a Generic iOS Device only, but I do not have a real iOS device connected to my Mac computer at all,
How To Download iOS Simulator To Fix Xcode Error Can’t Select iOS Simulator Read More »
When I develop iOS app use Xcode and build my iOS app, I suddenly meet an error which said failed to create provisioning profile. there are no devices registered in your account on the developer website. Plug in and select a device to have XCode register it. This error confused me a lot of times.
When i upgrade my Xcode to version 10.3 and build my iOS project, i meet an error message like this Failed to find or create execution context for description ‘<IBCocoaTouchPlatformToolDescription: 0x7fe0cfa54080> System content for IBCocoaTouchFramework-ElevenAndLater <IBScaleFactorDeviceTypeDescription: 0x7fe0cfa63cb0> scaleFactor=2x’. These intermediate objects were non-nil:. This error confused me a lot of time. But finally i find