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How to Display the iOS Share Sheet using Swift

A nice feature on iOS is the ability to share just about anything to anywhere using the built in sharing system. To achieve this in applications you can use the UIActivityViewController. I will show you how in this tutorial.

We have all seen this feature. You find a great piece of content and want to Tweet it, post it to Facebook or maybe just email to a friend. That is when the magic of the sharing sheet appears.

IMG_0360

It is not hard to add this feature to your Swift applications thanks to iOS. You only need to tell iOS what you want to share and it will present only those options capable of handling the content you send to it. It is worth noting that you can override the options iOS gives you but we will not cover that this time around. One thing to remember, on iPhone you present the sheet as a modal view but on the iPad you have to present it as a popover.

We are going to create an iPhone application with a text field to enter some text and a button that shares the contents using share sheet.

Setup

Start by creating a Swift based iOS application in Xcode. Now add a text field and a button using your method of choice. I added them to a storyboard from the object library. Next create an @IBAction and @IBOutlet for each in the view controller. I also added constraints to keep the layout nice and pretty regardless of the device.

Storyboard with Text Field and Button

Code Up the Magic

The button needs to handle any possible out comes and handle them gracefully. The share sheet should only show if there is something to share. We will check if the text field is empty and if it is just alert the user giving them instructions to enter something and try again.

If you are not familiar with the UIAlertController then I recommend my article ‘Display an Alert or Action Sheet Using Swift in iOS 8‘.

We are going to keep the code tidy by separating the creation and display of the Alert in a separate method. We will call the method with a title and message, add the following func to the view controller.

 

We call the method and tell it what to display. So back in the button @IBOutlet add the following if statement to check the contents of the field and call displayAlert when the field is empty.

 

Now to complete the button code we fill in that empty else statement with our call to the share sheet. To keep the code reusable we call a method to display the share sheet. Add the following method after func displayAlert(title: String, message: String) in the view controller.

 

We start by creating a new instance of the UIActivityViewController class and pass the arguments which in this example is a string. Note that it MUST be cast as an NSString, the UIActivityViewController expects this. Then we display the view.

Our last task is to call this method in the else block. The full code for the button should look something like this.

 

Here is the code for my view controller. You may of used different names for your @IBOutlet and @IBAction and should change as needed.

 

Run the Application

Run the application and enter some text. Click the button and the keyboard should disappear and share sheet should appear. I am using the simulator so share options may be different.

iPhone 6 - Simulator showing text in the text field

iPhone 6 - Simulator showing the share sheet

Wrap Up

This example shows how to start using the share sheet based on the content. I hope it has been useful and if so please share with others. I welcome comments and suggestions on improving the code. I also love to hear how you use this in your applications.