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Reddit mentions of iOS and macOS Performance Tuning: Cocoa, Cocoa Touch, Objective-C, and Swift (Developer's Library)
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Reddit mentions: 2
We found 2 Reddit mentions of iOS and macOS Performance Tuning: Cocoa, Cocoa Touch, Objective-C, and Swift (Developer's Library). Here are the top ones.
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Practically, you can use Swift for anything where you would use Objective-C, but there are a few situations you might use Objective-C and a few times you must Objective-C.
However even with the above, Swift is a better choice for new development. Apple has decided Swift is the future and is heavily investing in it. Performance is improving with Swift, the language is generally source code compatible for the last two years at least, and every year, more of the few remaining Objective-C only APIs have a Swift overlay.
if you're really worried about efficiency you might want to check iOS and macOS Performance Tuning. As everyone else said, there's very little relation between lines of code and performance. If you're getting an awful performance in your app it might be due to methods messing with other threads or poorly designed repetitive tasks.