情报来源：
iOS 13 running on iPhone Xs Max - NEW Dark Mode
https://www.youtube.com/watch?v=INd9xnH4TPc
tvOS 13: First Look!
https://www.youtube.com/watch?v=M2Tm4wGd9RM
iOS 13 Hands-On: How To Enable Dark Mode!
https://www.youtube.com/watch?v=9SHuYitTAy8
好想装啊 根本是饥饿行销
目前看情报好多大家渴望已久的功能都解禁了
结果超难安装 XD