swift scheme参数解析

找了好久没有找到，就自己整理了一份贴上，拿走拿走

写在字符串扩展里

extension String {
    public var parametersFromQueryString : [String: String]? {
        guard let components = URLComponents(url: (URL(string: self))!, resolvingAgainstBaseURL: true),
              let queryItems = components.queryItems else { return nil }
        return queryItems.reduce(into: [String: String]()) { (result, item) in
            result[item.name] = item.value
        }
    }
}