Open new Mail with attachment via Cocoa in Swift - swift

I am searching for a way to open a new Mail and attach a file as an attachment vis Swift on macOS.
There is a way to do this on iOS but I as far as I can see there seems no way on macOS for this.
Thanks for any hints!

Related

Support custom file extension in a flutter app ( Open file with extension .abc in flutter )

So I am exporting a file created in my application with extension .abc
Now, if the user shares the file on whatsapp or telegram or any other platform and when other user tries to open the file, the "open with" dialog should appear with my application in the list.
I have tried following approach which does not work plus it is only for Android and I am looking for multi-platform solution to this.
Is it possible to register a Flutter app as an Android Intent Filter and to handle Incoming Intents?
I was able to compile the app using above method but could not populate "Open with" dialog with my app's name
Thank you for your time.
EDIT 1:
So I have successfully added this functionality for android but I am still trying to add the same functionality for my iPhone users.
Can someone please help me with swift code part in iOS ??
I am not familiar with swift language but I want my users to be able to use same functionality on both platforms.
I have found a solution for iOS:
You can use the Uni Links package to get the notifications into your Flutter app.
You then need to manually add the file types in the Info.plist for the XCode project. You can find an explanation for example here.

How to open a custom data file from Mail in my iOS Application?

I have no clue where to get started with this. How do I enable "Open in... My App" in Mail, and then how do I load the custom data file into my application?
I don't think I'm wording it very well in my Google searches, as I have not found exactly what I am looking for or anything to lead me in the right direction.
Thank you very much.

How to implement the preview of a custorm file type in iOS's email attachment?

From iOS 3.2, application can be called to open specify files, lick .zip .
we try to implement an application can open the zip attachment file in iOS, it works.
But from iOS 4.0, apple provide a new file preview framework call Quick Look Framework. The default email application will open the preview of the file default. But the quick look framework doesn't provide a method to implement the preview of custom file type. Does anyone knows how to solve this problem? Right now if the file type is not support, the email will open a black preview View.
This problem was sloved by iOS 4.1

Windows Phone 7 open new email

How can I open new email programatically in Windows Phone 7? I found only solution with using WebBrowser control and using it Navigate method with "mailto" syntax. Is any better approach?
EmailComposeTask is another option.

To read Email via POP3 using iPhone SDK

I want to read the Email by giving username and password via POP3 using iPhone SDK for iPhone 4.0. Whether its possible to do it. If not can any body give me any link or open source to do achieve this functionality.
Thanks in Advance.
No, this is not possible without using a complete POP3 library (and I'm not aware of any that exist for iPhone). There's nothing in the SDK that will give you this for free.