// font for chat
let inputDefaultFont = UIFont.systemFont(ofSize: 14, weight: .regular)
// font for send button
let sendButtonDefaultFont = UIFont.systemFont(ofSize: 14, weight: .medium)
let customFont = UIFont(name: "{Custom Font}", size: 16)
// font for chat and send button
ShopLive.setChatViewFont(inputBoxFont: customFont, sendButtonFont: customFont)