Swift の Attribute

概述1. @attribute name@attribute name(attribute arguments)2. if #available(platform name version, ..., *) { statements to execute if the APIs are available} else { fallback statements to exe

1. @attribute name@attribute name(attribute arguments)2. if #available(platform name version,...,*) {    statements to execute if the APIs are available} else {    fallback statements to execute if the APIs are unavailable}Excerpt From: Apple Inc. “The Swift Programming Language (Swift 3.1).” iBooks.

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