additionalHeaders(for:)

Declaration

optional func additionalHeaders(for session: MEComposeSession) -> [String : [String]]

Parameters

• session:

  The session that represents the properties of the message in the compose window.

Return Value

A dictionary that maps header keys to arrays of string values.

Discussion

To add custom headers to an outgoing message, return a dictionary that contains the header key and an array of one or more values.

The following code shows an example of adding two custom headers: one with a single value, and another with multiple values.

func additionalHeaders(for session: MEComposeSession) -> [String : [String]] {
    // To insert custom headers into a message, return a dictionary with
    // the key and an array of one or more values.
    return [
        "X-CustomHeader": ["This is a custom header."],
        "X-CustomColors": ["Red", "Green", "Blue"]
    ]
}

The resulting message contains the following headers:

X-Customcolors: Red
X-Customcolors: Green
X-Customcolors: Blue
X-Customheader: This is a custom header.