一、调用系统键盘

预制件：MRTK/SDK/Experimental/MixedRealityKeyboard/Prefabs/MRKeyboardInputField_TMP.prefab
预制件：MRTK/SDK/Experimental/MixedRealityKeyboard/Prefabs/MRKeyboardInputField_UGUI.prefab

手动调用系统键盘

TouchScreenKeyboard keyboard = TouchScreenKeyboard.Open("", TouchScreenKeyboardType.Default, false, false, false, false);

二、调用预制键盘

示例场景：MRTK/Examples/Experimental/NonNativeKeyboard/Scenes/NonNativeKeyboardExample.unity
预制件：MRTK/SDK/Experimental/NonNativeKeyboard/Prefabs/NonNativeKeyboard.prefab