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Timelane + Combine
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Timelane + Combine


TimelaneCombine provides a Combine bindings for profiling Combine code with the Timelane Instrument.

Timelane Instrument

Table of Contens:


Import the TimelaneCombine framework in your code:

import TimelaneCombine

Use the lane(_) operator to profile a subscription via the TimelaneInstrument. Insert lane(_) at the precise spot in your code you'd like to profile like so:

downloadImage(at: url).
  .lane("Download: \(url.path)")
  .assign(to: \.image, on: myImageView)

Then profile your project by clicking Product > Profile in Xcode's main menu.

Select the Timelane Instrument template:

Timelane Instrument Template

Inspect your subscriptions on the timeline:

Timelane Live Recording

For a more detailed walkthrough go to



Use lane("Lane name") to send data to both the subscriptions and events lanes in the Timelane Instrument.

lane("Lane name", filter: [.subscriptions]) sends begin/completion events to the Subscriptions lane. Use this syntax if you only want to observe concurrent subscriptions.

lane("Lane name", filter: [.events]) sends events and values to the Events lane. Use this filter if you are only interested in values a subscription would emit (e.g. for example subjects).

Additionally you can transform the values logged in Timelane by using the optional transformValue trailing closure:

lane("Lane name") { value in
  return "Value: \(value)"

In case you are using @Published you can easily log that subscription to Timelane by using replacing it with:

@PublishedOnLane("My Lane") var property: String


Swift Package Manager

I . Automatically in Xcode:

  • Click File > Swift Packages > Add Package Dependency...
  • Use the package URL to add TimelaneCombine to your project.

II . Manually in your Package.swift file add:

.package(url: "", .from("1.0.4"))


CocoaPods is a dependency manager for Cocoa projects. For usage and installation instructions, visit their website. To integrate TimelaneCombine into your Xcode project using CocoaPods, specify it in your Podfile:

pod 'TimelaneCombine', '~> 1.0.4'


Carthage is a decentralized dependency manager that builds your dependencies and provides you with binary frameworks. To integrate TimelaneCombine into your Xcode project using Carthage, specify it in your Cartfile:

github "icanzilb/TimelaneCombine" "1.0.4"


The Timelane package contains a demo app at:


Copyright (c) Marin Todorov 2020 This package is provided under the MIT License.

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