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Send a critical alert message to iOS device users

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Your app is most likely to have users from different devices that run on iOS, Android, or the web, which calls for the need to implement platform-specific code when it comes to sending a notification such as a critical alert. A critical alert is a notification that can be sent to iOS device users even when Mute or Do Not Disturb is turned on. Use a UserMessageCreateParams instance to properly notify critical alert messages to iOS device users in your app.

First, create an AppleCriticalAlertOptions instance and set it as an attribute of a UserMessageCreateParams instance. Then, pass the UserMessageCreateParams instance as an argument to a parameter in the sendUserMessage(params:completionHandler:) method. The same applies to FileMessageCreateParams and sendFileMessage(params:completionHandler:).

Note: To learn more about how to set critical alerts, see Apple critical alerts.

// Send a critical alert user message.
let userMessageParams = UserMessageCreateParams(message: MESSAGE_TEXT)
let options = AppleCriticalAlertOptions()
options.name = "name"
options.volume = 0.7    // Acceptable values for options.volume are 0 to 1.0, inclusive.
userMessageParams.appleCriticalAlertOptions = options

channel.sendUserMessage(params: userMessageParams) { userMessage, error in
    guard error == nil else {
        // Handle error.
        return 
    }
}
// Send a critical alert file message.
let fileMessageParams = FileMessageCreateParams(file: FILE)
let options = AppleCriticalAlertOptions()
options.name = "name"
options.volume = 0.7    // Acceptable values for options.volume are 0 to 1.0, inclusive.
fileMessageParams.appleCriticalAlertOptions = options

channel.sendFileMessage(params: fileMessageParams) { fileMessage, error in
    guard error == nil else {
        // Handle error.
        return 
    }
}