What are some of the main advantages of Swift over Objective-C?
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Swift is easier to read Objective-C is constrained by C conventions, and arguably cannot be updated unless C itself is updated. By doing away with many legacy conventions like semicolons and parentheses for conditional expressions, Swift is simpler, easier to read, and more expressive.
Swift is safer Although a message sent to a nil object is perfectly acceptable in Objective-C and is treated as a no-op, Swift's explicitness about dealing with potentially nil values (Optionals) allows programmers to write cleaner, more transparent, and safer code. Finally, Swift’s strongly typed nature is another point in its favor.
Swift is less verbose I don't think I have to explain this one. If you've used Objective-C, you'll know what I mean (no need for header files, automatically generated memberwise initializers for structs, syntax is simpler, etc).
Swift is faster Swift's performance has been greatly improved by dropping legacy C conventions. With Apple’s continued support, this will likely only improve over time.
Swift has fewer namespace collisions Since Objective-C does not have formal support for namespaces, it‘s common to use a prefix for all class names to avoid conflict with external dependencies and modules. However, Swift provides implicit namespacing which sidesteps this problem without the need for prefixing class names.
Swift has greater ARC support With Swift, Automatic Reference Counting (ARC) is supported across all procedural and object-oriented code paths. Objective-C, on the other hand, only supports ARC within its object-oriented code and Cocoa APIs; it is not yet available for other APIs, like Core Graphics, and procedural C code.
Swift goes beyond iOS
Swift is truly cross-platform - not only can you use Swift to develop applications for iOS, iPadOS, tvOS, and macOS, but you can also use Swift for server-side development too (see Vapor).