How to set a mail Subject in UIActivityViewController? - ios

Question

I want to set subject for email sharing in UIActivityViewController and also want to share in Twitter. I know in Twitter if we want to share — we need compress text to 140 chars. I checked many SO solutions, but nothing is working.
Is this issue fixed in latest iOS releases? Any other "working solutions"?

Answer 1

Check below code for the email for setting up your email subject:
UIActivityViewController* avc = [[UIActivityViewController alloc] initWithActivityItems:#[#"Your String to share"]
applicationActivities:nil];
[avc setValue:#"Your email Subject" forKey:#"subject"];
avc.completionHandler = ^(NSString *activityType, BOOL completed) {
// ...
};
Here the line
[avc setValue:#"Your email Subject" forKey:#"subject"];
Makes the subject as "Your email Subject" if user picks email option in the UIActivityViewController.
I hope it helps...

Answer 2

It seems as though emreoktem's solution—sending setValue:forKey: to the UIActivityViewController—is undocumented.
On iOS 7 and later, you can implement the activityViewController:subjectForActivityType: method in an object conforming to the UIActivityItemSource protocol to do this in a way that is documented.

Answer 3

Here's a concrete solution for Swift 3.0+ based on the accepted answer. Note that, like the accepted answer, this is known to work only on the iOS Mail app and not necessarily other apps.
Implementation:
class MessageWithSubject: NSObject, UIActivityItemSource {
let subject:String
let message:String
init(subject: String, message: String) {
self.subject = subject
self.message = message
super.init()
}
func activityViewControllerPlaceholderItem(_ activityViewController: UIActivityViewController) -> Any {
return message
}
func activityViewController(_ activityViewController: UIActivityViewController, itemForActivityType activityType: UIActivityType) -> Any? {
return message
}
func activityViewController(_ activityViewController: UIActivityViewController,
subjectForActivityType activityType: UIActivityType?) -> String {
return subject
}
}
Usage:
Here's an example of usage. Note that it works well to use this as the first item in the activityItems array, and include any additional items to follow:
let message = MessageWithSubject(subject: "Here is the subject", message: "An introductory message")
let itemsToShare:[Any] = [ message, image, url, etc ]
let controller = UIActivityViewController(activityItems: itemsToShare, applicationActivities: nil)

Answer 4

For Swift 2.0+ & ios 8.0+
let title = "Title of the post"
let content = "Content of the post"
let objectsToShare = [title, content]
let activityVC = UIActivityViewController(activityItems: objectsToShare, applicationActivities: nil)
activityVC.setValue(title, forKey: "Subject")
self.presentViewController(activityVC, animated: true, completion: nil)