Latest 2.0.2
License MIT
Platforms ios 8.0
Dependencies Aspects

Easy dependency injection for storyboard segues.

import Perform

// ...

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: NSIndexPath) {
  let task = taskList[indexPath.row]
  perform(.showTaskDetails) { taskVC in
    taskVC.task = task


Configure your segues:

// Sources/Extensions/Segue.swift
import Perform

extension Segue {
  static var showTaskDetails: Segue<TaskDetailsViewController> {
    return .init(identifier: "ShowTaskDetails")

And then use perform(_:prepare:) instead of performSegue(withIdentifier:sender:).
That’s it!

Type-safe segues

Perform checks the type of the destination view controller and casts it for you,
raising an error if your destination view controller is an unexpected type.

Still works if your view controller is embedded in a container

Ever written code like this?

guard let nav = segue.destinationViewController as? UINavigationController,
  let content = nav.rootViewController as? MyViewController
  else { return }

// ... finally! 😭

Perform takes care of this, searching the view controller hierarchy for a view
controller of the matching type!

No switch statements in prepareForSegue(_:sender:)

Multiple segues from one view controller? No problem, just prepare each
destination view controller right where you perform the segue. No more massive
switch statements.

Further reading

For more examples, and a discussion about the motivation and design of Perform,
take a look at the introductory blog post.



Swift Version Perform Version
3.x 2.x
2.x 1.x


Add the following to your Cartfile:

github "thoughtbot/Perform" ~> 2.0

Then run carthage update Perform.

Follow the instructions in Carthage’s README for up-to-date
installation instructions.


Add the following to your Podfile:

pod "Perform", "~> 2.0"

See the CocoaPods guide for up-to-date installation


See the CONTRIBUTING document.


Perform is Copyright (c) 2016 thoughtbot, inc.
It is free software, and may be redistributed
under the terms specified in the LICENSE file.



Perform is maintained and funded by thoughtbot, inc.
The names and logos for thoughtbot are trademarks of thoughtbot, inc.

We love open source software!
See our other projects
or hire us to help build your product.

Latest podspec

    "name": "Perform",
    "version": "2.0.2",
    "summary": "Easy dependency injection for storyboard segues.",
    "homepage": "",
    "license": {
        "type": "MIT",
        "file": "LICENSE"
    "authors": "Adam Sharp",
    "source": {
        "git": "",
        "tag": "2.0.2"
    "platforms": {
        "ios": "8.0"
    "source_files": "Sources/Perform/**/*.swift",
    "dependencies": {
        "Aspects": [
            "~> 1.4"

Pin It on Pinterest

Share This