Customization: InputViewStyle
The InputViewStyle structure describes the parameters of the message input element


Description of InputViewStyle parameters:
- viewBackColor: UIColor - background color of the message input element (gray in the pic)
 - textBackColor: UIColor - background color of the message input text (white in the pic)
 - textColor: UIColor - text color
 - placeholderTextColor: UIColor - placeholder text color
 - font: UIFont - text font
 - textHeightMin: CGFloat - minimum text height
 - textHeightMax: CGFloat - maximum text height
 - textMargin: UIEdgeInsets - external indents of the message text relative to the background of the text
 

inputTextViewBorderWidth: CGFloat - the width of the background message text frame
inputTextViewBorderColor: UIColor - background border message text color
- inputTextViewRadius: CGFloat - the radius of the background rounding message text
 - inputTextViewMargin: UIEdgeInsets - outer indents of the message text background. Top and bottom indents are taken into account
 

- heightAssetsCollection: CGFloat - collection height with photo/video
 
topMarginAssetsCollection: CGFloat - outer top indent of the collection with photo/video to the message input field