再需要添加邮件系统提示和邮件发送检测。
//邮件系统提示
func showSendMailErrorAlert() {
let sendMailErrorAlert = UIAlertController(title: NSLocalizedString("Unable To Send", comment: "Unable To Send"), message: NSLocalizedString("Your device has not been set up, please set in the mail application and then try to send.", comment: "Your device has not been set up, please set in the mail application and then try to send."), preferredStyle: .alert)
sendMailErrorAlert.addAction(UIAlertAction(title: NSLocalizedString("Confirm", comment: "Confirm action title"), style: .default) { _ in })
self.present(sendMailErrorAlert, animated: true){}
}
//邮件发送检测
func mailComposeController(_ controller: MFMailComposeViewController, didFinishWith result: MFMailComposeResult, error: Error?) {
switch result.rawValue {
case MFMailComposeResult.cancelled.rawValue:
print("取消发送")
case MFMailComposeResult.sent.rawValue:
print("发送成功")
default:
break
}
self.dismiss(animated: true, completion: nil)
}
最后我们在调用邮件反馈的地方,需要先判断是否能够发送,如果不能发送通过提示信息告诉用户失败原因,如果可以发送将成功调取发送窗口。 在需要邮件反馈的地方:
if MFMailComposeViewController.canSendMail() {
//注意这个实例要写在if block里,否则无法发送邮件时会出现两次提示弹窗(一次是系统的)
let mailComposeViewController = configuredMailComposeViewController()
self.present(mailComposeViewController, animated: true, completion: nil)
} else {
self.showSendMailErrorAlert()
}

三、系统分享功能
分享前,我们需要设置好分享的信息:标题、图片、链接。
var webUrl:String = "https://www.easck.com/cn/app/id1355476695"
var urlTitle:String = "OneScreen"
var urlImage:UIImage = #imageLiteral(resourceName: "onescreen_icon")
这里使用了var,是为了在特殊情况下改变他们的值,具体的调用方式如下:
let shareVC:UIActivityViewController = UIActivityViewController(activityItems: [self.urlTitle,self.urlImage,self.webUrl], applicationActivities: nil)
self.present(shareVC, animated: true, completion: {
print("shareVC success")
})

四、打开某些网址
打开网址可以实现“官方网址”、“应用更新说明”功能,更新说明我们可以通过更新Web内容快速高速用户更新列表。如果你的应用需要比较多的教程,也可以通过网页的形式展现。为了方便用户反馈,我通常会增加一个微博入口,让用户打开微博地址快速与我联系进行反馈。








