这种方法实现简单，但需要在每个 iOS 调用点手动处理类型转换。
Share this on Hacker News.，这一点在im钱包官方下载中也有详细论述
With a built-in lightbar, a three-mode camping light that packs into the top of the power station, 768Wh and 1200W rated power, and enough ports to plug in up to 10 devices at once, the Solix C800x makes a great companion for off-grid living. You can charge it up with a traditional outlet, a solar panel (sold separately), or a car port for convenience. And since it's just 24 pounds, it's easy to take with you on the move.，更多细节参见旺商聊官方下载
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