Swift 5 - Email Class Helper / Manager
问题 Edit: Big thanks to Paulw11 for helping me solve this issue. I've added the full code here for easy reuse: Class: import UIKit import MessageUI struct Feedback { let recipients: [String] let subject: String let body: String let footer: String } class FeedbackManager: NSObject, MFMailComposeViewControllerDelegate { private var feedback: Feedback private var completion: ((Result<MFMailComposeResult,Error>)->Void)? override init() { fatalError("Use FeedbackManager(feedback:)") } init?(feedback: