Optimizing Mobile Apps: Tips and Tricks

Transcript

1. Emerge Tools Optimizing Mobile Apps: Tips & Tricks
2. Common App Challenges • Performance optimization • Managing app size • Handling multiple screen sizes
3. Tip 1: Stripping Binary Symbols
4. Tip 1: Stripping Binary Symbols • They are not required to be in production apps. • We can still get fully symbolicated crash reports using dSYMs.
5. Tip 1: Stripping Binary Symbols
6. Tip 1: Stripping Binary Symbols #!/bin/bash set -e # if [ "Release" = "${CONFIGURATION}" ]; then # Only do this for release builds # Path to the app directory APP_DIR_PATH="${BUILT_PRODUCTS_DIR}/${EXECUTABLE_FOLDER_PATH}" # Strip main binary strip -rSTx "${APP_DIR_PATH}/${EXECUTABLE_NAME}" # Path to the Frameworks directory APP_FRAMEWORKS_DIR="${APP_DIR_PATH}/Frameworks" # Strip symbols from frameworks, if Frameworks/ exists at all # ... as long as the framework is NOT signed by Apple if [ -d "${APP_FRAMEWORKS_DIR}" ] then find "${APP_FRAMEWORKS_DIR}" -type f -perm +111 -maxdepth 2 -mindepth 2 -exec bash -c 'codesign -v -R="anchor apple" "{}" &> /dev/null || (echo "{}" && strip -rSTx "{}")' \\; fi # fi
7. Tip 1: Stripping Binary Symbols - Examples
8. Tip 2: Sharing Code and Assets
9. Tip 2: Sharing Code and Assets • Share code and assets using dynamic frameworks. • Load frameworks from the app bundle using runtime search paths (@rpath).
10. Tip 2: Sharing Code and Assets - Examples
11. Tip 2: Sharing Code and Assets
12. Tip 2: Sharing Code and Assets
13. Tip 3: Optimizing Assets
14. Tip 3: Optimizing Assets • Xcode converts vectors (SVG and PDF) to PNGs when building. • Vectors file size do not represent final size on the app.
15. Tip 3: Optimizing Assets
16. Tip 3: Optimizing Assets • Local & Open Source: https://github.com/GoogleChromeLabs/squoosh • Web: TinyPNG
17. Tip 4: Keep the Main Thread Light
18. Tip 4: Keep the Main Thread Light • Delays on the Main Thread lead to poor user experience. • Offload heavy task to the background. Including: ◦ JSON loading. ◦ Image decoding.
19. Tip 4: Keep the Main Thread Light let image = UIImage(named: "myNAME") image.prepareForDisplay { [weak self] decodedImage in self?.imageView.image = decodedImage }
20. Tip 5: Prefer Static Dispatch
21. Tip 5: Prefer Static Dispatch class Animal { // Might not use Static Dispatch func eat() { // Do something } } final class Dog: Animal { // Swift will try to use Static Dispatch override func eat() { } }
22. Tip 5: Prefer Static Dispatch class Animal { func eat() { // Swift will use Static Dispatch findFood() } private func findFood() { } }
23. Tip 5: Prefer Static Dispatch
24. Tip 6: Understanding your Package Manager
25. Tip 6: Understanding your Package Manager - SPM Cons: • Limited support for mixed language projects. • Lower number of available dependencies (mainly old and legacy). Pros: • Supported by Apple. • Integrates easily with Xcode.
26. Tip 6: Understanding your Package Manager - CocoaPods Cons: • May modify our project files (which might involve git conflicts later). Pros: • Well maintained by the community. • Supports plugins.
27. Tip 7: Optimizing CoreML Models
28. Tip 7: Optimizing CoreML Models • Try half precision models. • Keep trying lower precision models to keep improving performance and weight.
29. Tip 7: Optimizing CoreML Models
30. Tip 7: Optimizing CoreML Models - Example
31. Tip 8: Never stop improving
32. Tip 8: Never stop improving New tools in Swift 5.9: • Macros • If and swift expressions • Noncopyable structs and enums • Consume operator