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InfluxDB
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Hi I think core graphics will probably be sufficient for a simple drawing app with layers and some shapes. I think for more complicated shapes or more dynamic rendering you may want to look into metal apis. https://github.com/OwenCalvin/hand-drawing-swift-metal seemed to be a pretty solid implementation of drawing with metal apis. Although if you are trying to learn I personally see no problem starting with core graphics. I hope this was helpful.
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