Swift 关键字

Swift Keywords

环境
Swift 5

Keywords used in declarations:

associatedtype, class, deinit, enum, extension, fileprivate, func, import, init, inout, internal, let, open, operator, private, precedencegroup, protocol, public, rethrows, static, struct, subscript, typealias, and var.

Keywords used in statements:

break, case, catch, continue, default, defer, do, else, fallthrough, for, guard, if, in, repeat, return, throw, switch, where, and while.
Keywords used in expressions and types: Any, as, catch, false, is, nil, rethrows, self, Self, super, throw, throws, true, and try.

Keywords used in patterns:

_.

Keywords that begin with a number sign (#):

#available, #colorLiteral, #column, #dsohandle, #elseif, #else, #endif, #error, #fileID, #fileLiteral, #filePath, #file, #function, #if, #imageLiteral, #keyPath, #line, #selector, #sourceLocation, and #warning.

Keywords reserved in particular contexts:

associativity, convenience, didSet, dynamic, final, get, indirect, infix, lazy, left, mutating, none, nonmutating, optional, override, postfix, precedence, prefix, Protocol, required, right, set, some, Type, unowned, weak, and willSet. Outside the context in which they appear in the grammar, they can be used as identifiers.

参考资料
swift 官网