Basic example for sharing text or image with UIActivityViewController in Swift

UIActivityViewController Example Project

Set up your storyboard with two buttons and hook them up to your view controller (see code below).

Add an image to your Assets.xcassets. I called mine "lion".

Code

import UIKit
class ViewController: UIViewController {
    
    // share text
    @IBAction func shareTextButton(_ sender: UIButton) {
        
        // text to share
        let text = "This is some text that I want to share."
        
        // set up activity view controller
        let textToShare = [ text ]
        let activityViewController = UIActivityViewController(activityItems: textToShare, applicationActivities: nil)
        activityViewController.popoverPresentationController?.sourceView = self.view // so that iPads won't crash
        
        // exclude some activity types from the list (optional)
        activityViewController.excludedActivityTypes = [ UIActivity.ActivityType.airDrop, UIActivity.ActivityType.postToFacebook ]
        
        // present the view controller
        self.present(activityViewController, animated: true, completion: nil)
        
    }
    
    // share image
    @IBAction func shareImageButton(_ sender: UIButton) {
        
        // image to share
        let image = UIImage(named: "Image")
        
        // set up activity view controller
        let imageToShare = [ image! ]
        let activityViewController = UIActivityViewController(activityItems: imageToShare, applicationActivities: nil)
        activityViewController.popoverPresentationController?.sourceView = self.view // so that iPads won't crash
        
        // exclude some activity types from the list (optional)
        activityViewController.excludedActivityTypes = [ UIActivity.ActivityType.airDrop, UIActivity.ActivityType.postToFacebook ]
        
        // present the view controller
        self.present(activityViewController, animated: true, completion: nil)
    }
    
}

Result

Clicking "Share some text" gives result on the left and clicking "Share an image" gives the result on the right.

Notes

• I retested this with iOS 11 and Swift 4. I had to run it a couple times in the simulator before it worked because it was timing out. This may be because my computer is slow.
• If you wish to hide some of these choices, you can do that with excludedActivityTypes as shown in the code above.
• Not including the popoverPresentationController?.sourceView line will cause your app to crash when run on an iPad.
• This does not allow you to share text or images to other apps. You probably want UIDocumentInteractionController for that.

See also

• Add sharing to your Swift app via UIActivityViewController
• UIActivity​View​Controller from NSHipster
• UIActivityViewController documentation
• Share extension documentation
• comparison with UIDocumentInteractionController

Share : Text

@IBAction func shareOnlyText(_ sender: UIButton) {
    let text = "This is the text....."
    let textShare = [ text ]
    let activityViewController = UIActivityViewController(activityItems: textShare , applicationActivities: nil)
    activityViewController.popoverPresentationController?.sourceView = self.view 
    self.present(activityViewController, animated: true, completion: nil)
}
}

Share : Image

@IBAction func shareOnlyImage(_ sender: UIButton) {
    let image = UIImage(named: "Product")
    let imageShare = [ image! ]
    let activityViewController = UIActivityViewController(activityItems: imageShare , applicationActivities: nil)
    activityViewController.popoverPresentationController?.sourceView = self.view 
    self.present(activityViewController, animated: true, completion: nil)
 }

Share : Text - Image - URL

   @IBAction func shareAll(_ sender: UIButton) {
    let text = "This is the text...."
    let image = UIImage(named: "Product")
    let myWebsite = NSURL(string:"https://stackoverflow.com/users/4600136/mr-javed-multani?tab=profile")
    let shareAll= [text , image! , myWebsite]
    let activityViewController = UIActivityViewController(activityItems: shareAll, applicationActivities: nil)
    activityViewController.popoverPresentationController?.sourceView = self.view 
    self.present(activityViewController, animated: true, completion: nil)
   }

Just as a note you can also use this for iPads:

activityViewController.popoverPresentationController?.sourceView = sender

So the popover pops from the sender (the button in that case).

I found this to work flawlessly if you want to share whole screen.

@IBAction func shareButton(_ sender: Any) {

    let bounds = UIScreen.main.bounds
    UIGraphicsBeginImageContextWithOptions(bounds.size, true, 0.0)
    self.view.drawHierarchy(in: bounds, afterScreenUpdates: false)
    let img = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    let activityViewController = UIActivityViewController(activityItems: [img!], applicationActivities: nil)
    activityViewController.popoverPresentationController?.sourceView = self.view
    self.present(activityViewController, animated: true, completion: nil)
}