Flutter 仿抖音 TikTok 上下滑动 播放视频UI框架，视频播放使用 video_player
实现功能： 1.上下滑动自动播放，loading 封面图占位 2.全屏横竖屏切换 3.播放进度条显示 4.仿抖音评论弹窗
效果图：
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