swift 重载自定义操作符

关键字 infix operatore

infix operator <-->//: AdditionPrecedence
extension String {
 
    static func <-->(_ content: String, _ comment: String) -> String {

        return NSLocalizedString(content, comment: "")
    }
    
    func localization(_ comment: String? = nil) -> String {
        return NSLocalizedString(self, comment: comment ?? "")
    }
    
    /// 项目中采用这个方法简化NSLocalizedString方法
    var l: String {
        get {
            return NSLocalizedString(self, comment: "")
        }
    }
}