Join Scott Gardner for an in-depth discussion in this video Reference selectors and key paths, part of Swift 3 Essential Training: Beyond the Basics.
- [Instructor] In Swift, prior to Version 2.2,…referencing the selector name of properties and methods…was done using string literals.…This was prone to bugs due to typos in the strings.…Selector expressions were introduced…from methods in Swift 2.2.…The primary reason to use selectors,…is to enable interoperability with object to CAPI…that relies on Objective-C's dynamic runtime,…such as, to implement target action…or handle notifications from NSNotification center.…
I'm starting out with a definition…of a view controller subclass of UIViewController.…It implements a data property,…which is a set of type string and a method…handleKeyboardDidChangeFrameNotification,…which would be used to update the UI…in response to receiving the system notification…UIKeyboardDidChangeFrame,…such as, from showing or hiding the keyboard.…In order to add this view controller…as an observer of the UIKeyboardDidChangeFrameNotification,…I'll call NotificationCenter's addObserver method…that takes a selector, notification name, and object.…
- Adding source files, resources, links, and literals
- Adding pages to a playground
- Using overflow operators and bitwise operators
- Using ranges with strings
- Creating complex sequences
- Chaining higher-order functions
- Defining lazy properties
- Using failable initializers
- Mutating methods
- Working with singletons
- Nesting function types
- Creating error types and recursive enumerations
- Extending concrete types
- Referencing selectors and key paths
- Working with protocol-oriented programming
- Defining class-only protocols and optional protocols
- Using option sets, type checking, and casting operators
Skill Level Intermediate
Core Data for iOS and macOS Enterprise Developerswith Jon Bott1h 46m Intermediate
Distributing Your iOS App for Testing with TestFlightwith Ron Buencamino35m 10s Intermediate
iOS App Development: Test-Driven Developmentwith Harrison Ferrone2h 14m Intermediate
3. Strings and Characters
4. Sequences and Collections
5. Control Flow
6. Value and Reference Types
9. Access Control
Understand access control3m 47s
Next steps1m 2s
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