The purpose of the LGSemiModalNavController is to allow you to show a view controller a dynamically set height over another view controller.
The effect this custom transition gives off is that a view partially springs up from the bottom of the screen and into place. The view that gets sprung over, gets scaled down by a customizable amount.
lgsemimodalnavcontroller的目的是允許你顯示一個視圖控制器動態設置高度在另一個視圖控制器。
這個自定義轉換的效果是，一個視圖部分從屏幕底部彈出并進入。被激活的視圖會被可定制的數量縮小。
