![]() The above screenshot is the second run, Run 2 of 2. Run timer: The timer counts how long the profiled app has been running and how many times it has run.The pause button pauses the current execution of the app. Recording controls: The record button stops and starts the app currently under test.Make sure you have all the detail views open by toggling the view selectors on the right-hand side of the toolbar: Well, you’re in luck, as you’re about to embark on fixing it! But you’re first going to get a quick rundown of what you’re looking at in Instruments. You’ll notice that going into a search result is slow, and scrolling through a list of search results is annoying. Search for some images, and drill down into one or more of the search results. In the Instruments window, you can see the time counting up and a little arrow moving from left to right above the graph in the center of the screen. macOS may ask for your password to authorize Instruments to analyze other processes. Click the record button at the top left to start recording and launch the app. Select the Time Profiler instrument and click Choose to open a new Instruments document. These are all different templates that come with Instruments. This builds the app and launches Instruments. So without any further ado, time to get instrumenting! Instrumentingįrom Xcode’s menu bar, select Product ▸ Profile or press Command-I. That said, your app may seem to run fine in the simulator, but you might discover a performance issue once it’s running on a real device. The iOS simulator has all the horsepower of your Mac behind it, whereas a device has all the limitations of mobile hardware. ![]() Note: Always profile your app on an actual device instead of the simulator. It’s a crude approximation, but it works! The Instruments tool approximates the time spent in each method by counting the number of times the profiler stops in each method.įor instance, if you take 100 samples at 1 millisecond intervals and a particular method appears at the top of the stack in 10 samples, you can deduce that the app spent approximately 10% of the total execution time - 10 milliseconds - in that method. Each row is a different method the program’s execution path has followed. The Call Tree shows the amount of time spent executing various methods within an app. Think of it as clicking the pause button in Xcode’s debugger. At measured intervals, Instruments halts the execution of the program and takes a stack trace on each running thread. The first instrument you’ll look at is Time Profiler. You’ll see how Instruments can make debugging problems much easier! Time for Profiling The rest of this tutorial shows you how to find and fix issues that still exist in the app. But you’re about to see the value that using Instruments can add to your app. You might think that once the UI looks great, the app is ready for store submission. Play with the app and check out its basic functions. The app will let you know whenever the key is invalid.īuild and run, perform a search, click the result and you’ll see something like this: Note: The API key changes every day or so, so you’ll occasionally have to regenerate a new key. To update the project, open FlickrAPI.swift and replace the existing API key value with your new value. You can find this by looking for the number between &api_key= and the next & you see. ![]() This will generate a URL link at the very bottom of the page that looks like:.Find and click Call Method… at the bottom of the page. ![]()
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