Mastering Swift 2 Programming (Video 25)

This video tutorial explains how to bridge Swift and Objective-C, focusing on exposing Swift code to Objective-C. It covers creating an Objective-C project, adding a Swift file, configuring build settings, and calling Swift code from Objective-C. The tutorial also discusses access modifiers and how to manage visibility between the two languages.

What is the default behavior of a Swift class that subclasses NSObject in terms of Objective-C exposure?

• Only its methods are exposed to Objective-C.

• The entire class is exposed to Objective-C by default.

• It is not exposed to Objective-C at all.

• Only its properties are exposed to Objective-C.

Which keyword can be used to explicitly expose Swift properties and methods to Objective-C?

• @visible

• @expose

• @objc

• @public

What is the first step in creating an Objective-C project that runs Swift code?

• Create a new Swift file.

• Open Xcode and create a new project.

• Configure build settings.

• Set up a bridging header manually.

What should you do when prompted to create a bridging header while adding a Swift file?

• Click 'Create'.

• Click 'Don't Create'.

• Ignore the prompt.

• Manually create a bridging header.

Which build setting must be enabled to allow Objective-C compatibility?

• Install Objective-C Compatibility Header

• Enable Objective-C Bridging

• Enable Swift Optimization

• Swift Code Optimization

What access modifier should be used to make a Swift class visible to Objective-C?

• Internal

• Protected

• Private

• Public

How can you print a Swift message variable to the console from Objective-C?

• Use NSLog with the message variable.

• Directly print the variable in Swift.

• Use a bridging function to print.

• Use a custom Objective-C function.