我创建一个csv文件，并尝试通过电子邮件发送。显示用于发送邮件的窗口，但未填写电子邮件正文，并且没有附加文件。应用程序在此屏幕上挂起：
按钮“取消”不工作。在控制台中几秒钟后出现：
viewServiceDidTerminateWithError: Error Domain=_UIViewServiceInterfaceErrorDomain Code=3 "The operation couldn’t be completed. (_UIViewServiceInterfaceErrorDomain error 3.)" UserInfo=0x7f8409f29b50 {Message=Service Connection Interrupted}
<MFMailComposeRemoteViewController: 0x7f8409c89470> timed out waiting for fence barrier from com.apple.MailCompositionService
有我的代码：
func actionSheet(actionSheet: UIActionSheet!,clickedButtonAtIndex buttonIndex: Int) {
if buttonIndex == 0 {
println("Export!")
var csvString = NSMutableString()
csvString.appendString("Date;Time;Systolic;Diastolic;Pulse")
for tempValue in results { //result define outside this function
var tempDateTime = NSDate()
tempDateTime = tempValue.datePress
var dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "dd-MM-yyyy"
var tempDate = dateFormatter.stringFromDate(tempDateTime)
dateFormatter.dateFormat = "HH:mm:ss"
var tempTime = dateFormatter.stringFromDate(tempDateTime)
csvString.appendString("\n\(tempDate);\(tempTime);\(tempValue.sisPress);\(tempValue.diaPress);\(tempValue.hbPress)")
}
let fileManager = (NSFileManager.defaultManager())
let directorys : [String]? = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory,NSSearchPathDomainMask.AllDomainsMask,true) as? [String]
if ((directorys) != nil) {
let directories:[String] = directorys!;
let dictionary = directories[0];
let plistfile = "bpmonitor.csv"
let plistpath = dictionary.stringByAppendingPathComponent(plistfile);
println("\(plistpath)")
csvString.writeToFile(plistpath,atomically: true,encoding: NSUTF8StringEncoding,error: nil)
var testData: NSData = NSData(contentsOfFile: plistpath)
var myMail: MFMailComposeViewController = MFMailComposeViewController()
if(MFMailComposeViewController.canSendMail()){
myMail = MFMailComposeViewController()
myMail.mailComposeDelegate = self
// set the subject
myMail.setSubject("My report")
//Add some text to the message body
var sentfrom = "Mail sent from BPMonitor"
myMail.setMessageBody(sentfrom,isHTML: true)
myMail.addAttachmentData(testData,mimeType: "text/csv",fileName: "bpmonitor.csv")
//Display the view controller
self.presentViewController(myMail,animated: true,completion: nil)
}
else {
var alert = UIAlertController(title: "Alert",message: "Your device cannot send emails",preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "OK",style: UIAlertActionStyle.Default,handler: nil))
self.presentViewController(alert,completion: nil)
}
}
else {
println("File system error!")
}
}
}
尝试改为使用UIActivityViewController发送邮件：
let fileURL: NSURL = NSURL(fileURLWithPath: plistpath) let actViewController = UIActivityViewController(activityItems: [fileURL],applicationActivities: nil) self.presentViewController(actViewController,completion: nil)
看到大致相同的屏幕发送电子邮件，一会儿后返回到上一个屏幕。在控制台中，现在又出现了另一个错误：
viewServiceDidTerminateWithError: Error Domain=_UIViewServiceInterfaceErrorDomain Code=3 "The operation couldn’t be completed. (_UIViewServiceInterfaceErrorDomain error 3.)" UserInfo=0x7faab3296ad0 {Message=Service Connection Interrupted}
Errors encountered while discovering extensions: Error Domain=PlugInKit Code=13 "query cancelled" UserInfo=0x7faab3005890 {NSLocalizedDescription=query cancelled}
<MFMailComposeRemoteViewController: 0x7faab3147dc0> timed out waiting for fence barrier from com.apple.MailCompositionService
有关于PlugInKit的东西。
使用UIDocumentInteractionController改为UIActivityViewController：
let docController = UIDocumentInteractionController(URL: fileURL)
docController.delegate = self
docController.presentPreviewAnimated(true)
...
func documentInteractionControllerViewControllerForPreview(controller: UIDocumentInteractionController!) -> UIViewController! {
return self
}
我看到这个屏幕与内容的CSV文件：http://prntscr.com/4ilgax我按右上角的按钮导出，看到这个屏幕http://prntscr.com/4ilguk在那里我选择MAIL和几秒钟我看到http://prntscr.com/4ilh2h然后返回显示文件的内容！在控制台中使用与使用UIActivityViewController时相同的消息。
* *重要 – 请勿使用模拟器。 * *
即使在2016年，模拟器非常简单地不支持从应用程序发送邮件。
事实上，模拟器根本没有邮件客户端。
但！看到底部的消息！
亨利给了完全答案。你必须
– 在较早阶段分配和启动MFMailComposeViewController，和
– 把它保存在一个静态变量中，然后，
– 每当需要时，获取静态MFMailComposeViewController实例并使用它。
你几乎肯定必须在每次使用后循环全局MFMailComposeViewController。重复使用同一个是不可靠的。
有一个全局例程，释放然后重新初始化单例MFMailComposeViewController。每次完成邮件编写器后，调用该全局例程。
在任何singleton。不要忘记，你的应用程序委托是，当然是一个单例，所以做那里…
@property (nonatomic,strong) MFMailComposeViewController *globalMailComposer;
-(BOOL)application:(UIApplication *)application
didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
........
// part 3,our own setup
[self cycleTheGlobalMailComposer];
// needed due to the worst programming in the history of Apple
.........
}
和…
-(void)cycleTheGlobalMailComposer
{
// cycling GlobalMailComposer due to idiotic iOS issue
self.globalMailComposer = nil;
self.globalMailComposer = [[MFMailComposeViewController alloc] init];
}
然后使用邮件，这样的东西…
-(void)helpEmail
{
// APP.globalMailComposer IS READY TO USE from app launch.
// recycle it AFTER OUR USE.
if ( [MFMailComposeViewController canSendMail] )
{
[APP.globalMailComposer setToRecipients:
[NSArray arrayWithObjects: emailAddressNSString,nil] ];
[APP.globalMailComposer setSubject:subject];
[APP.globalMailComposer setMessageBody:msg isHTML:NO];
APP.globalMailComposer.mailComposeDelegate = self;
[self presentViewController:APP.globalMailComposer
animated:YES completion:nil];
}
else
{
[UIAlertView ok:@"Unable to mail. No email on this device?"];
[APP cycleTheGlobalMailComposer];
}
}
-(void)mailComposeController:(MFMailComposeViewController *)controller
didFinishWithResult:(MFMailComposeResult)result
error:(NSError *)error
{
[controller dismissViewControllerAnimated:YES completion:^
{ [APP cycleTheGlobalMailComposer]; }
];
}
{nb，fixed typo per Michael Salamone below。}
为了方便起见，在您的前缀文件中有以下宏
#define APP ((AppDelegate *)[[UIApplication sharedApplication] delegate])
还有一个“小”的问题，可能会花费你的天：http://stackoverflow.com/a/17120065/294884
只是为2016年FTR这里的基本swift代码发送电子邮件IN APP，
class YourClass:UIViewController,MFMailComposeViewControllerDelegate
{
func clickedMetrieArrow()
{
print("click arrow! v1")
let e = MFMailComposeViewController()
e.mailComposeDelegate = self
e.setToRecipients( ["help@smhk.com"] )
e.setSubject("Blah subject")
e.setMessageBody("Blah text",isHTML: false)
presentViewController(e,completion: nil)
}
func mailComposeController(controller: MFMailComposeViewController,didFinishWithResult result: MFMailComposeResult,error: NSError?)
{
dismissViewControllerAnimated(true,completion: nil)
}
然而！注意！
这些天，它是糟糕的发送电子邮件“在应用程序”。
今天好多了，只是切断电子邮件客户端。
添加到plist …
<key>LSApplicationQueriesSchemes</key>
<array>
<string>instagram</string>
</array>
然后代码就好了
func pointlessMarketingEmailForClient()
{
let subject = "Some subject"
let body = "Plenty of <i>email</i> body."
let coded = "mailto:blah@blah.com?subject=\(subject)&body=\(body)".stringByAddingPercentEncodingWithAllowedCharacters(.URLQueryAllowedCharacterSet())
if let emailURL:NSURL = NSURL(string: coded!)
{
if UIApplication.sharedApplication().canOpenURL(emailURL)
{
UIApplication.sharedApplication().openURL(emailURL)
}
else
{
print("fail A")
}
}
else
{
print("fail B")
}
}
这些天，这比尝试从“内部”的应用程序电子邮件更好。
