![]() The third component of the MVC paradigm, the model layer, varies according to your app type and design. In a well-designed app, you typically see a one-to-one relationship between a window and its controller. In Cocoa, a window is an instance of the NSWindow class, and the associated controller object is an instance of the NSWindowController class. Regardless of which category an app falls into, nearly every macOS app makes use of the Model-View-Controller (MVC) relationship, a core design pattern. Multi-window document-based like TextEdit.Single-window library-style “shoebox” like Photos.macOS apps fall into one of the following categories: They define the area on the screen that the app is currently responsible for, and allow users to interact using a well-understood multi-tasking paradigm. Windows are the “containers” for the user interfaces presented by all macOS apps. The original tutorial was written by Gabriel Miro. Update note: This Windows and WindowController Tutorial for macOS has been updated to Xcode 8 and Swift 3 by Warren Burton.
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