![]() ![]() Note: Use Command-plus or Command-minus to zoom in or zoom out in the timeline.Īs seen in the image above, there are two tasks in the Today tab.Ĭheck the task to get the quote of the day. The Instrument timeline will look something like this: Now that you’ve gathered the data, observe the timeline and tasks. In the Today tab, tap Shuffle and wait for a moment. Now that you know about all the information the tool provides, it’s time to profile the app and see how it fares! Profiling and Inspecting the Appįirst, profile the starter app as a new session and start recording. However, in some instances, a task may have more than one transaction, for example when there are redirects or URL forwarding. In other words, and in its simplest terms, a transaction starts when you call resume() on a task, and it ends when the associated completion block is called. It begins when you call resume and calls the respective completion closures before it ends.Ī Transaction refers to a single instance of communication with a web service. Task and TransactionĪ Task is akin to a URLSessionDataTask or URLSessionDownloadTask. Thus, it works on all Apple devices and all HTTP traffic passing through the app when using any networking API. But, Instruments relies on the lower-level networking stack of Apple’s core frameworks. How the HTTP Traffic Instrument Worksįor communicating with web services, you use higher-level networking APIs such as URLSession. Next, you’ll learn how HTTP Traffic Instrument actually works. Note: You can also save the session to reference later by clicking File ▸ Save. You can remove the Network Connections Instrument as it’s unnecessary for this tutorial. To stop the recording, press Record again.While the recording is in progress, use the app and visit different screens.To begin recording, press Record in the toolbar or press Command-R.Choose Network when the profiling template selection dialog appears.Choose Product ▸ Profile from the menu or press Command-I.Open the starter project and set the run target as your device.Follow the steps below to profile using Instruments: ![]() Inspecting the Appīefore testing the app on a device, change the bundle identifier if necessary and set the provisioning profile. Now that you have a better understanding of the tool, next you’ll use it to inspect the app. Currently, the HTTP Traffic Instrument doesn’t support simulator, mocking requests or responses, injecting or modifying payloads. While it’s a great tool, it has limitations. It even works when SSL pinning is enforced or when using a VPN, all while showing the entire requests and responses in a pretty format for HTTP/s connections. HTTP Traffic also enables network debugging without needing to install any certificates on the device. In this way, it’s unlike other proxy web debugging tools available, such as Charles Proxy or Proxyman. HTTP Traffic not only helps you see what’s happening with the request/response you receive while using a web service API, it also helps you see what’s happening with the connection. In its Network profiling template, Instruments 13 introduces a new HTTP Traffic Instrument which lets you track and inspect all the HTTP traffic flowing in the app. The instrument you’ll use here is the HTTP Traffic Instrument. Instruments can help to identify the underlying issues. Try using the app, and you’ll notice a few issues that need addressing. Check out the data models, views and view models to understand the implementation. This file is the networking helper class that manages all the API requests and responses in the app. Pay particular attention to DataProvider.swift. You can use these test credentials to login to the app or signup for an account at. You’ll use the APIs provided by and for this tutorial. Navigate around the app to familiarize yourself with the UI. Profile: Lets the user login and displays user activity on login.Explore: A list of quotes the user can select, view and bookmark.Today: Shows the Quote of the Day along with a Shuffle button.The starter project is a tab-based app called Shuffle built using Swift UI. Use the Download Materials button at the top or bottom of this tutorial to download the starter project. Note: You’ll need an Apple Developer account to run the app on a physical device. ![]()
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