Tauseef FayyazA to Z
Glossary
Every concept in this sheet, plus the smaller terms it uses. Select a concept to open its card.
A
- Actors, MainActor and Sendable
- An
actorprotects its state so only one task touches it at a time. - async/await and Task
- An
asyncfunction can suspend while waiting.
C
- Closures and capture lists
- Closures are functions without a name that capture surrounding values.
D
- Declarative UI
- You describe what the screen should look like for the current state, and the framework works out what to change on screen.
E
- Enums with associated values
- Swift enums can carry data with each case, such as
.loaded([Post]). - Error handling with throws
- A function marked
throwscan fail; callers usetryinsidedoandcatch.
H
- Hot reload and previews
- Tools that show code changes in a running app or an editor preview within a second or two, without rebuilding the whole app.
L
- Lazy lists
- A lazy list only builds the rows currently on screen, plus a few ahead, and recycles them as you scroll.
- let, var and type inference
letdeclares a constant andvara variable.
O
- Optionals and unwrapping
- An optional
String?either holds a value ornil.
P
- Platform design guidelines
- Material Design 3 is Google's design system for Android, and the Human Interface Guidelines are Apple's rules for iOS.
- Protocols and extensions
- A protocol lists requirements a type promises to meet, like
IdentifiableorCodable.
R
- Rows, columns and stacks
- The basic layout containers place children horizontally, vertically or on top of each other, with spacing and alignment options.
S
- Safe areas and screen sizes
- Safe areas, or insets, are the parts of the screen not covered by the notch, status bar, camera cutout or gesture bar.
- Structs versus classes
- Structs are value types: assigning one makes an independent copy.
- Swift collections
- Array, Dictionary and Set are value types: assigning one copies it, cheaply, with copy on write.
- Swift Package Manager
- Apple's dependency manager, built into Xcode.
T
- Text input and forms
- A text field shows a value from state and reports every change back.
- Theming and dark mode
- A theme defines colours, typography and shapes in one place.
V
- View modifiers
- A modifier such as
.padding()or.font(.headline)returns a new view that wraps the original.