By Leader S.

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Note XCPlayground only works for NSView- and UIView-based subviews. XCShowView If you are developing a custom view and would like to show the results, you can call this method to display what the view looks like; it takes an identifier that is displayed at the top of the view so you know which view is being displayed. XCShowView(identifier : String, view : NSView) XCShowView(identifier : String, view : UIView) XCCaptureValue You are developing your program and you want to display some values; you can use this function to display the values.

We will be using playgrounds throughout this book whenever we need to demonstrate some code. It is much easier than edit-compile-run-loop. We will also discuss the parts of the playground and what functionality they provide—and how to become really good at using playgrounds. Getting Started with a Playground If you don’t have Xcode running, launch it; you will be greeted with the Welcome to Xcode screen. One of the options is to create a playground. Select the Get started with a playground to create a new playground.

The compiler will report an error because Swift is a strongly typed language; it means that every variable must have a type associated with it. This will take care of lots of runtime errors that are associated with type conversation/coercion. When you are editing your code, if there is an error on the line, the editor will display a stop icon on the left of the line numbers. If you need to see the error message, you click on the icon so the error appears as shown in Figure 2-4. Figure 2-4. Missing Type Error CHAPTER 2: The Swift Playground in Xcode 19 To give a type to a variable in Swift, you add the type after the variable name, separated by a colon.

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1-differentials on 1-cells: a further study by Leader S.

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