Introduction to PyObjC Core

PyObjC is a bridge between Python and Objective-C, allowing you to call Objective-C APIs from Python. This is crucial for macOS applications, making Python a powerful language for developing macOS software. In this blog post, we will delve into `pyobjc-core` and explore dozens of useful APIs with code snippets. We will also create a sample app utilizing the introduced APIs.

API Examples

1. Calling Objective-C Methods

 
  from Foundation import NSObject

  class MyClass(NSObject):
      def init(self):
          self = super(MyClass, self).init()
          if self is None: return None
          return self

  obj = MyClass.alloc().init()
  

2. Working with NSString

 
  from Foundation import NSString

  py_string = "Hello, PyObjC!"
  ns_string = NSString.stringWithString_(py_string)
  print(ns_string)
  print(ns_string.lowercaseString())
  

3. Using NSArray

 
  from Foundation import NSArray

  py_list = ["apple", "banana", "cherry"]
  ns_array = NSArray.arrayWithArray_(py_list)
  print(ns_array)
  print(ns_array.objectAtIndex_(1))
  

Building a Simple macOS App

Let’s create a basic macOS application using PyObjC.

1. Define the Application Delegate

 
  from Cocoa import NSApplication, NSApp, NSObject, NSWindow, NSWindowStyleMask

  class AppDelegate(NSObject):
      def applicationDidFinishLaunching_(self, notification):
          self.create_menu()
          self.create_window()

      def create_menu(self):
          NSApp.mainMenu().addItem_(self.create_menu_item())

      def create_menu_item(self):
          menu_item = NSApplication.sharedApplication()
          return menu_item

      def create_window(self):
          self.window = NSWindow.alloc().initWithContentRect_styleMask_backing_defer_(
              ((200, 500), (600, 400)),
              NSWindowStyleMask.titled | NSWindowStyleMask.closable,
              2,
              False
          )
          self.window.setTitle_("My Simple App")
          self.window.makeKeyAndOrderFront_(None)
  

2. Run the Application

 
  if __name__ == "__main__":
      app = NSApplication.sharedApplication()
      delegate = AppDelegate.alloc().init()
      app.setDelegate_(delegate)
      app.run()
  

That’s it! You have created a simple macOS application using PyObjC. This application sets up a basic window and a menu item.

Exploring the `pyobjc-core` library can greatly enhance your ability to create efficient and powerful macOS applications using Python. We hope this guide has been a valuable resource and inspires you to dive deeper into macOS development with PyObjC.

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