iOS system design
Image loading memory
You show 60 thumbnails of 4000×3000 JPEGs in a 3-column grid and memory jumps to several hundred MB. What's the most effective fix?
Pick one
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Performance and debuggingShort answerAdvanced
A photo editing app gets frequent memory warnings and sometimes gets killed. In what orde…
#image #downsampling #memory
Performance and debuggingShort answerAdvanced
You need to show a single 50MB photo on screen. If you just load it with UIImage(contents…
#image #downsampling #memory
Performance and debuggingMultiple choiceBasics
You decode a 100×100 pixel RGBA PNG (3KB on disk) to draw it on screen. Which value is cl…
#image #memory
Performance and debuggingShort answerAdvanced
An iOS feature that edits and saves photos of tens of MB gets killed after a memory warni…
#downsampling #memory