In daily development and testing, many performance issues do not occur instantaneously but accumulate over time. For example:
- An app becomes significantly more power-hungry after some use.
- The battery drains abnormally after running in the background overnight.
- The device heats up after frequent use of certain features.
If you only look at the current state, it is often difficult to analyze the cause of these issues. More valuable information is actually the app’s usage history and energy consumption records over a period of time.
Below, we will explain how to view iOS app usage history and energy consumption methods based on the troubleshooting process.
Information Provided by the System
iOS’s built-in battery statistics can show:
Settings → Battery
Here you can obtain:
- App power consumption percentage
- Usage duration (foreground / background)
This step is usually used for a preliminary judgment, such as confirming whether a particular app consumes the most power.
However, the problem is that this data is aggregated and lacks details:
- Cannot see specific time points
- Cannot see which specific hardware components were called
- Unable to reconstruct the usage process
When the issue involves what happened during a specific time period, system information is insufficient.
Information Provided During Development
During the development phase, you can use Instruments for analysis, such as Energy Log.
This method is suitable for short-term testing, like a page operation or a feature execution, but it is not ideal for analyzing usage over the past few days.
Viewing Historical Records with iOS Device Management Tools
In project testing, if the issue involves long-term usage or reproduction in user environments, I prefer to use iOS device management tools to view historical records.
Here, I have used Keymob Assistant quite a bit; it can directly read app usage history and energy consumption records on iOS devices.
The key point is that this data is historical, not a real-time snapshot.
Practical Operation: Viewing App Usage History and Energy Consumption
Below is a relatively complete operational process.
Step 1: Connect the Device and Initialize Data
Prepare an iPhone or iPad:
- Connect to the computer using a data cable.
- Open Keymob Assistant.
- Wait for device recognition to complete.
On first use, follow the prompts to obtain historical data (this step is crucial).
Step 2: View App Energy Consumption Ranking
Navigate to:
Usage Records → App Energy Consumption
Here, the energy consumption of all apps on the device will be listed.
You can do several things:
- Sort by energy consumption
- Quickly identify abnormal apps
- Compare resource consumption across different apps
You can see if a particular app is significantly abnormal.
Step 3: View Detailed Data for a Single App
After finding the target app, click Details on the right.
Inside, you can see:
- Daily energy consumption trends
- Time distribution within a specific day
- Hardware components used
Step 4: Analyze Specific Time Periods
Click on the bar chart for a specific day to further break it down:
- The app launched at a specific time point
- Continuous operation during a certain period
- Whether specific hardware was called
For example, you can see:
- A significant increase in CPU usage during a certain period
- Frequent network or audio usage during a certain period
This information is more valuable than simple battery percentage alone.
Troubleshooting Process
Test feedback indicated that the app was not used much, but the battery drained quickly.
The troubleshooting process was as follows:
Step 1: Check system battery statistics to confirm that the app indeed consumed a lot of power.
Step 2: Open the app energy consumption ranking and find that the app ranked high.
Step 3: View detailed records and discover a long-running record during the early morning of a specific day.
Step 4: Further examine the time period and find that network components were continuously used during that time.
Ultimately, the cause was confirmed: a background task did not stop properly, leading to continuous network requests.
Why I Think Usage History Is More Important Than Real-Time Data
Real-time performance data only tells you what is happening now, but many issues, I believe, require knowing what happened before.
The value of usage history records lies here:
- Can align with user feedback timing
- Can reconstruct the problem occurrence process
- Can discover intermittent issues
Energy consumption issues in iOS apps are often not caused by a single factor but are the result of combined app behavior and hardware usage. Compared to real-time monitoring, historical usage records can provide more complete contextual information.
By combining system battery statistics, development tools, and iOS device historical record tools, you can more clearly reconstruct the resource consumption of apps in real-world usage scenarios.