# Enabling the bot link feature with the SDK

You can display an option to add the LINE Official Account as a friend when a user logs in to your app. This is called the bot link feature. Developers can specify the LINE Official Account to be added as a friend.

Before getting started with the configuration, see Add a LINE Official Account as a friend when logged in (bot link) in the LINE Login documentation to understand the bot link feature and the following specifics:

  • Linking a LINE Official Account with your channel on the console
  • The bot prompt parameter sent to the LINE Platform and its behavior
  • The friendship status flag returned from the LINE Platform and its meaning

This topic explains how to enable these bot link functions with the LINE SDK:

# Setting the bot prompt parameter in the login request

The following sample code shows how to set .botPromptNormal or .botPromptAggressive as the bot prompt parameter in the login request:

// Includes an option to add a LINE Official Account as a friend in the consent screen.
var parameters = LoginManager.Parameters()
parameters.botPromptStyle = .normal
LoginManager.shared.login(permissions: [.profile], parameters: parameters) {
    // ...
}

// Opens a new screen to add the LINE Official Account as a friend after the user agrees to the permissions in the consent screen.
parameters.botPromptStyle = .aggressive
LoginManager.shared.login(permissions: [.profile], parameters: parameters) {
    // ...
}

For more information about the parameter values, see LoginManager.Parameters and LoginManager.BotPrompt in the LINE SDK for iOS Swift reference.

# Checking the friendship status between the user and the LINE Official Account

You can check the friendship status between the user and the LINE Official Account using the following methods.

# Check the friendshipStatusChanged property in the login response

After successful login, the friendshipStatusChanged property of the LoginResult object contains a boolean value that indicates whether the friendship status has changed.

The following conditions must be met to get the friendship status flag:

  • The bot prompt option is specified in the login request.
  • The consent screen with the option to add your LINE Official Account as a friend is displayed to the user.

The following sample code shows how to get the friendshipStatusChanged property.

var parameters = LoginManager.Parameters()
parameters.botPromptStyle = .normal
LoginManager.shared.login(permissions: [.profile], parameters: parameters) {
    result in
    switch result {
    case .success(let value):
        print(value.friendshipStatusChanged)
    case .failure(let error):
        print(error)
    }
}

For more information about the friendshipStatusChanged property, see friendshipStatusChanged in the LINE SDK for iOS Swift reference.

# Use the Social API to get friendship status

Call the getBotFriendshipStatus method after the user has logged in to your app and an access token has been returned.

API.getBotFriendshipStatus { result in
    switch result {
    case .success(let value): print(value.friendFlag)
    case .failure(let error): print(error)
    }
}

For more information about the return values, see getBotFriendshipStatus in the LINE SDK for iOS Swift reference.