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並前往https://stackoverflow.com/questions/32437977/drawing-a-ruler-in-ios-accurate-1-cm-on-screen-how-to-draw-lines-1-mm-apart

Drawing a ruler in iOS - accurate 1 cm on screen

1mm therefore is 163/25.4 or approximately 6.4. iPad is 5.2 points per mm, iPad mini is the same as iPhone. -(void)drawRect:(CGRect)rect { ...

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