MFMailComposeViewController throws an error only in iOS 9

Question

I can\'t get MFMailComposeViewController to open without throwing a fatal error in iOS 9 Simulator.

The same code (Objective C) works flawlessly in iOS 8.x and lower

Answer 1

As a simple work around for this problem, you can use "mailto" protocol, it will:

• Not crash the app (device and simulator)
• Prompt the user to login if the device has not login with any mail account

Example in swift:

Swift 3.0

let mailRecipient = "support@abc.com"
let mailSubject = "Help with ABC for iOS"
let mailBody = "xxx"

let mailTo = "mailto:\(mailRecipient)?subject=\(mailSubject)&body=\(mailBody)"

guard let escapedMailTo = mailTo.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed) else {
    NSLog("Invalid mail to format")
    return
}

guard let url = NSURL(string: escapedMailTo) else {
    NSLog("Invalid mail to format: \(escapedMailTo)")
    return
}

UIApplication.sharedApplication().openURL(url)

Swift 2.3

let mailRecipient = "support@abc.com"
let mailSubject = "Help with ABC for iOS"
let mailBody = "xxx"

let mailTo = "mailto:\(mailRecipient)?subject=\(mailSubject)&body=\(mailBody)"

guard let escapedMailTo = mailTo.stringByAddingPercentEncodingWithAllowedCharacters(.URLQueryAllowedCharacterSet()) else {
    NSLog("Invalid mail to format")
    return
}

guard let url = NSURL(string: escapedMailTo) else {
    NSLog("Invalid mail to format: \(escapedMailTo)")
    return
}

UIApplication.sharedApplication().openURL(url)