There are already apps like Duet that allow iPhone or iPad to be used as an extended screen of MacBook, butRelated NewsIt is said that Apple may add a similar feature in macOS 10.15, allowing users to directly "cast" the MacBook screen display content to the iOS device through an application function called "Sidecar".
The specific details of the "Sidecar" application function cannot be confirmed at present, but it is possible that it will be similar to apps such as Duet, allowing MacBook models to project the screen image onto iOS devices via wired or wireless means, and can further be operated through finger touch or Apple Pencil. This means that for content creators using MacBook models, this function will allow iPads that support Apple Pencil to be directly turned into handwriting tablets, and even allow text workers to use it as an extended screen.
In addition to being used as an extended screen, Apple also plans to make Sidecar's app functionality more intuitive to use with a simple tap. It will also automatically align display windows, making it easier to compare content displayed on different screens. Such apps will also allow iPads or iPhones to have more diverse app modes and enhance the integration between MacBooks and iOS devices, allowing Apple products to offer greater productivity.
Apple is expected to announce this feature as early as WWDC 2019. Given that Duet was developed by a former Apple engineer, it is unclear whether Apple values this type of functional application. Perhaps there is some degree of cooperation between Apple and Duet?
