17.15 Monitoring Application Performance
Another useful feature of Xcode is the ability to monitor the performance of an application while it is running, either on a device or simulator or within the Live Preview canvas. This information is accessed by displaying the Debug Navigator.
When Xcode is launched, the project navigator is displayed in the left-hand panel by default. Along the top of this panel is a bar with a range of other options. The seventh option from the left displays the debug navigator when selected as illustrated in Figure 17-26. When displayed, this panel shows a number of real-time statistics relating to the performance of the currently running application such as memory, CPU usage, disk access, energy efficiency, network activity and iCloud storage access.
When one of these categories is selected, the main panel (Figure 17-27) updates to provide additional information about that particular aspect of the application’s performance...