Hold down Ctrl , drag into the text view until it highlights, and then release the mouse. A small window with the list of Outlets will show. Select the text outlet:. With two lines of code and the default functionality provided by Cocoa, you have created a mini word processor! Modal windows are the attention seekers of the window world. Once presented, they consume all events until they are dismissed. The save and open panels that all macOS apps use are good examples of modals.

Sheet modals appear from the top of the window that presents them. The save alert in BabyScript is an example. Drag a new Window Controller from the Object Library into the canvas. Select the Window from the new Window Controller Scene and use the Size Inspector to set its width to and height to With the window still selected, select the Attributes Inspector and uncheck the Close, Resize and Minimize controls. Then, set its title to Word Count. Having minimize and resize buttons in the title bar would be strange.

Now, select the View from the new View Controller Scene and use the Size Inspector to set its width to and height to Line them up like the image below. Select the Attributes Inspector. Now change the alignment of all the labels to right justified. Select the proxy icon for the word count view controller and open the Identity Inspector.

Open WordCountViewController. The dynamic modifier makes the two properties compatible with Cocoa Bindings. Then open the Bindings inspector and do the following:.

Repeat the same for the paragraph count numeric label, but this time use paragraphCount into the Model Key Path. Select the Window Controller of the Word Count window. You now have the storyboard components for the Word Count window ready and waiting. You are almost done. So, hang in there! In WordCountViewController. In this method you simply stop the modal session you started earlier. A modal session must always be explicitly stopped to return the app to normal operations. Release the mouse and select dismissWordCountWindow: from the presented list:.

Still in Main. Select showWordCountWindow: from the list. Here, you connected the menu item to the first responder, not directly to showWordCountWindow in ViewController. Here is the final version of BabyScript. For a better understanding of Cocoa and how it works with the types of apps mentioned at the beginning, check out the Mac App Programming Guide. If you would like to see the complete version, with saving and opening documents working, download this more complete app.

It gives you an idea of how little work is needed to implement a complete document based app. Full access to the largest collection of Swift and iOS development tutorials anywhere!

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He creates interesting tools for Xcode development and Ernesto is a Mac and iOS developer from Spain. Fahim is a developer with over 25 years of experience in developing in over a dozen different languages. Fahim's current focus Michael is an Independent Software Developer with over 30 years of programming experience. With a free raywenderlich.

This content has been archived. Note : The origin for Cocoa views is the bottom left corner. So, Y values increase with distance from the bottom edge. This is in contrast to iOS where the view origin is at top-left.

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Note : macOS remembers window positions between app launches. In order to see the changes you make, you need to close the window s , and then build and run. Note : Cocoa Bindings is a super useful technique for UI development. If you want to learn more about it, have a look at our Cocoa Bindings on macOS tutorial. Core Concepts macOS Tutorials.

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Tech Editor. Fahim Farook Fahim is a developer with over 25 years of experience in developing in over a dozen different languages. Michael Briscoe Michael is an Independent Software Developer with over 30 years of programming experience.

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Team Lead. In this Windows and WindowController Tutorial for macOS, learn how to create a document based Cocoa app using modal windows and Sierra new tabbed interface. Show Comments. Create your free learning account today! Get Started. The legacy garbage collector is still available on Mac OS X version In , the LLVM compiler introduced Automatic Reference Counting ARC , which replaces the conventional garbage collector by performing static analysis of Objective-C source code and inserting retain and release messages as necessary.

Cocoa consists of three Objective-C object libraries called frameworks. Frameworks are functionally similar to shared libraries , a compiled object that can be dynamically loaded into a program's address space at runtime, but frameworks add associated resources, header files, and documentation.

The Cocoa frameworks are implemented as a type of bundle , containing the aforementioned items in standard locations. A key part of the Cocoa architecture is its comprehensive views model. This is organized along conventional lines for an application framework, but is based on the Portable Document Format PDF drawing model provided by Quartz. This allows creating custom drawing content using PostScript -like drawing commands, which also allows automatic printer support and so forth.

Since the Cocoa framework manages all the clipping, scrolling, scaling and other chores of drawing graphics, the programmer is freed from implementing basic infrastructure and can concentrate on the unique aspects of an application's content. The Smalltalk teams at Xerox PARC eventually settled on a design philosophy that led to easy development and high code reuse.

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Named model-view-controller MVC , the concept breaks an application into three sets of interacting object classes:. Cocoa's design is a fairly, but not absolutely strict application of MVC principles. Under OpenStep, most of the classes provided were either high-level View classes in AppKit or one of a number of relatively low-level model classes like NSString.

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No stock class represented a "document," for instance. During the transition to Cocoa, the model layer was expanded greatly, introducing a number of pre-rolled classes to provide functionality common to desktop applications. In Mac OS X These classes are considered part of the Cocoa Bindings system, which also makes extensive use of protocols such as Key-Value Observing and Key-Value Binding.

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  • The term 'binding' refers to a relationship between two objects, often between a view and a controller. Bindings allow the developer to focus more on declarative relationships rather than orchestrating fine-grained behavior. With the arrival of Mac OS X In effect, the framework greatly simplifies the process of making changes to application data, undoing changes when necessary, saving data to disk, and reading it back in.

    In providing framework support for all three MVC domains, Apple's goal is to reduce the amount of boilerplate or "glue" code that developers have to write, freeing up resources to spend time on application-specific features. In most object-oriented languages, calls to methods are represented physically by a pointer to the code in memory.

    This restricts the design of an application since specific command handling classes are needed, usually organized according to the chain-of-responsibility pattern. While Cocoa retains this approach for the most part, Objective-C's late binding opens up more flexibility. Under Objective-C, methods are represented by a selector , a string describing the method to call. When a message is sent, the selector is sent into the Objective-C runtime, matched against a list of available methods, and the method's implementation is called.

    Since the selector is text data, this lets it be saved to a file, transmitted over a network or between processes, or manipulated in other ways. The implementation of the method is looked up at runtime, not compile time. There is a small performance penalty for this, [5] but late binding allows the same selector to reference different implementations.