Swift 面试题与答案
问题 26. What is the purpose of the 'static' keyword in Swift?
The 'static' keyword in Swift is used to define type-level properties and methods that are associated with the type itself, rather than an instance of the type.
问题 27. Explain the concept of type casting in Swift.
Type casting is the process of converting one type to another, and it can be done in Swift using 'as', 'as?', and 'as!' operators.
问题 28. What is the Swift Package Manager (SPM) used for?
Swift Package Manager is a tool for managing the distribution of Swift code as source or binary packages.
问题 29. How do you create a custom delegate in Swift?
To create a custom delegate in Swift, define a protocol, adopt it in the delegating class, and use optional delegate methods to notify the delegate of events.
问题 30. What are the key differences between Swift and Objective-C?
Swift is a modern, safer, and more concise language compared to Objective-C. It introduces optionals, type inference, generics, and is memory-safe with Automatic Reference Counting (ARC).
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