seniorSwift
How does Swift handle bridging between Objective-C and Swift at runtime?
Updated May 17, 2026
Short answer
Swift uses bridging layers to convert between Objective-C runtime objects and Swift types.
Deep explanation
Bridging occurs via runtime metadata translation. NSString becomes String, NSArray becomes Array. Objective-C dynamic messaging is mapped to Swift method calls. Bridging introduces overhead and requires careful memory management.
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