访问原生 iPhone、Android、Windows Phone 和 Windows 应用商店应用程序屏幕键盘的接口，在其他平台上不可用。
此接口可以显示不同类型的键盘：ASCII、
数字、URL、Email 和其他。
显示的键盘可能会遮挡
部分用户界面，在显示键盘时，
需要确保不会遮挡用户界面
部分。TouchScreenKeyboard.visible 和 TouchScreenKeyboard.area 应
用于确定键盘是否显示（激活）以及使用
哪部分屏幕。
Windows 应用商店应用程序：在通用 Windows 10 应用程序中，只有具有触摸输入支持的基于 XAML 的应用程序才支持触摸屏幕键盘。
| area | 返回被键盘覆盖的屏幕部分。 |
| hideInput | 当键盘在屏幕上时是否隐藏键盘上的文本输入字段？ |
| isSupported | 是否支持触摸屏幕键盘。 |
| visible | 只要屏幕上有完全可见的键盘，就返回 true。 |
| active | 键盘可见还是滑入屏幕位置？ |
| canGetSelection | 指定 TouchScreenKeyboard 是否支持 selection 属性。（只读） |
| canSetSelection | 指定 TouchScreenKeyboard 是否支持 selection 属性。（只读） |
| characterLimit | 键盘输入字段可以输入的字符数限制。0 = 无限。 |
| selection | 获取或设置目前正在编辑的字符串中的所选文本的字符范围。 |
| status | 返回屏幕键盘的状态。（只读） |
| targetDisplay | 指定软件键盘将显示在哪个显示屏上。 |
| text | 返回键盘的输入字段显示的文本。 |
| type | 返回键盘的 TouchScreenKeyboardType。 |
| Open | 在屏幕上打开操作系统提供的原生键盘。 |
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