Developer Docs - Mobile Docs - Text Editor
Inherits from Xamarin.Forms.Editor
Like the Text Box, the Text Editor allows the user to enter text into a form. While the Text Box only allows a single line of text, the Text Box allows the user to enter multiple lines of text.
Unlike the related input in HTML, you cannot specify the height in lines of text. Instead you will need to specify the height in pixels.
If you want to set initial text that contains new line characters, you will need to either encode them as an XML escape sequence or use the alternate assignment method. The escape sequences for Carriage Return and Line Feed respectively are 
 and 
.
Properties
Example
As you can see, in the above example we used the inline method to specify the default multi-line text value. Another method to achieve the same exact result that may be a bit easier to read/write, especially if you are hard coding the value in XAML.
Whichever method you choose, you will need to ensure that you have encoded any XML characters, such as <, >, or &.