MMSPartContent A structure that defines custom headers within MMS content. Declarationstruct MMSPartContent TopicsCreating a content partinit(data:contentType:contentID:disposition:fileName:)Accessing part propertiesdatadispositionMMSPartContent.MMSDispositionTypefilenamecontentIDcontentTypeUTTypeWorking with custom headerscustomHeadersaddCustomHeader(_:)MMSPartContent.MMSCustomHeader RelationshipsConforms ToDecodableEncodableSendableSendableMetatype See AlsoAccessing content propertiespartssubjectheaders