Like dealing with illustrator figures,
Is there any way to handle lines as a figure?
Draw a line from one point to another and
It is assumed that the line itself can be dragged to move, rotate, or shrink.
Use the framework Core Graphics.Also known as Quartz2D, it is recommended that you use both keywords when searching online.
Drawing and Printing Guide for iOS
Graphic processing is such a big genre that you won't be able to learn overnight, so I recommend you to study steadily.
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