How to set a mail Subject in UIActivityViewController?

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

Answer 1

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.