rawValue 用于swift中的enum(枚举)，用于取枚举项的原始值，例如：
enum Category: String, CaseIterable, Codable, Hashable {
case featured = "Featured"
case lakes = "Lakes"
case rivers = "Rivers"
case mountains = "Mountains"
}
Category.lakes.rawValue 就是 "Lakes"
rawValue 用于swift中的enum(枚举)，用于取枚举项的原始值，例如：
enum Category: String, CaseIterable, Codable, Hashable {
case featured = "Featured"
case lakes = "Lakes"
case rivers = "Rivers"
case mountains = "Mountains"
}
Category.lakes.rawValue 就是 "Lakes"
本文标题：Swift中rawValue的作用
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