I have intregrated mesibo chat sdk in flutter framework all is working good but can't able to have contact letter image after enabling the useLetterTitleImage = true . Can any body can tell what function add for contact image android it is working but getting issue on ios i am sharig file and screen shot as well 
Code :
import UIKit
import mesibo
import MesiboUI
class SecondViewController: UIViewController,MesiboDelegate {
override func viewDidLoad() {
super.viewDidLoad()
let ui = Mesibo.getInstance().getUiOptions()
UINavigationBar.appearance().tintColor = UIColor.white
ui?.contactPlaceHolder = nil
ui?.mStatusBarColor = 0xf000000
ui?.mToolbarColor = 0xf000000
ui?.enableBackButton = false
ui?.useLetterTitleImage = true
ui?.emptyUserListMessage = "NO MESSAGES"
Mesibo.getInstance()?.setUiOptions(ui!)
navigationController?.navigationItem.setHidesBackButton(true, animated:false)
navigationController?.pushViewController(MesiboUI.getViewController(navigationController?.delegate), animated: false)
Mesibo.getInstance()?.addListener(self)
}
override func didMove(toParent parent: UIViewController?) {
super.didMove(toParent: parent)
if parent == nil {
debugPrint("Back Button pressed.")
}
}
private func add(asChildViewController viewController: UIViewController) {
// Add Child View Controller
addChild(viewController)
// Add Child View as Subview
view.addSubview(viewController.view)
// Configure Child View
viewController.view.frame = view.bounds
viewController.view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
// Notify Child View Controller
viewController.didMove(toParent: self)
}
func mesibo_(onConnectionStatus status: Int32) {
print("Connection status: %d", status);
}
func mesibo_(onMessageStatus params: MesiboParams!) {
print(params ?? "")
}
func mesibo_(onMessage params: MesiboParams!, data: Data!) {
print("data")
}
func mesibo_(onMessageFilter params: MesiboParams!, direction: Int32, data: Data!) -> Bool {
return true
}
func mesibo_(onUserProfileUpdated profile: MesiboUserProfile!, action: Int32, refresh: Bool) {
}
func mesibo_(onShowProfile parent: Any!, profile: MesiboUserProfile!) {
}
func mesibo_(onUpdateUserProfiles profile: MesiboUserProfile!) -> Bool {
return true
}
