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This post is translated by ChatGPT and originally written in Mandarin, so there may be some inaccuracies or mistakes.
Using screen recording can be quite cumbersome, especially since you have to manually adjust the frame each time. So, I looked into whether it was possible to record video using the simulator, and I found that it actually is—and surprisingly simple too! You just need to use a command line instruction:
xcrun simctl io booted recordVideo --codec=h264 transition.mp4After pressing ctl+c, the video file will be automatically generated. Just make sure that there are no files with the same name. Additionally, since I often upload my repros to GitHub, and GitHub doesn’t support video files, I use ffmpeg to convert them into GIF files:
ffmpeg -ss 2 -t 20 -i YOUR_VIDEO_NAME -vf "fps=10,scale=320:-1:flags=lanczos,split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse" -loop 0 OUTPUT.gifThen I’ll take my time to study the parameters of ffmpeg. In any case, this way I can convert video files into GIF files—awesome!
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