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如果安装了邮件,则执行功能,如果未打开应用商店页面

url-scheme url email swift ios

RandomGeek · 技术社区 · 7 年前

我正试着按照标题所说的做,但当我点击按钮打开邮件时,我的应用程序在没有安装邮件应用程序的情况下崩溃了。你能帮我解决这个问题吗?

代码:

if UIApplication.shared.canOpenURL(URL(string: "mailto://")!) {
            // Mail is installed. Launch Mail and start function:
            let toRecipients = ["oExample@gmail.com"]

        let mc: MFMailComposeViewController = MFMailComposeViewController()

        mc.mailComposeDelegate = self

        mc.setToRecipients(toRecipients)
        mc.setSubject("Why does it crash?")

        mc.setMessageBody("×©× ×××¨: \(CrashNameField.text!) \n\n×¢××¨: \(CrashReasonNameField.text!)", isHTML: false)

        self.present(mc, animated: true, completion: nil)

    }else {
            // Mail is not installed. Launch AppStore to install Mail app
            UIApplication.shared.openURL(URL(string: "https://itunes.apple.com/gb/app/mail/id1108187098?mt=8")!)
        }
    }

libc++abi.dylib: terminating with uncaught exception of type NSException 在线崩溃: class AppDelegate: UIResponder, UIApplicationDelegate{ .额外信息: Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Application tried to present a nil modal view controller on target

1 回复 | 直到 7 年前

Nazmul Hasan 7 年前

试着这样做

 var picker = MFMailComposeViewController()
    if MFMailComposeViewController.canSendMail() {
        picker.mailComposeDelegate = self
        picker.setSubject("Test mail")
        picker.setMessageBody(messageBody.text, isHTML: true)
        present(picker as? UIViewController ?? UIViewController(), animated: true) { _ in }
    }

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