Preface
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In this article, we’ll talk about the performance optimization related questions from Alibaba & ByteDance: A Set of Efficient iOS Interview Questions.
Performance Optimization
The main optimizations are as follows:
- How to optimize startup, and how to monitor it
- How to optimize lag, and how to monitor it
- How to optimize battery consumption, and how to monitor it
- How to optimize networking, and how to monitor it
First, optimization must be approached from multiple dimensions to yield significant gains.
Here I recommend carefully analyzing your own project and studying Dai Ming’s article How to Analyze iOS Startup Time Cost.
You must analyze and approach it from multiple dimensions.
The runtime initialization process is divided into:
- Loading class extensions
- Loading C++ static objects
- Calling +load functions
- Executing the main function
- Application initialization, until applicationDidFinishLaunchingWithOptions finishes executing Initializing frame rendering, until viewDidAppear finishes executing, when the user can see and interact with the UI.
Summary
There are no standard answers for performance optimization, so I’m sharing an important article as a starting point and reference. As long as you achieve the intended optimization goals and keep the program stable, that’s enough.