How IOS implements dashed line drawing

because the project needs to draw a dashed line, initially want to use the picture repeat overlay implementation. A lap or a uiview. The code is as follows
. h file

#import <UIKit/UIKit.h> @interface dasheslineview:uiview@property (nonatomic) Cgpoint startpoint;// Dashed start @property (nonatomic) cgpoint endpoint;//dashed End @property (nonatomic,strong) uicolor* linecolor;//dashed color @end

. m file

#import "DashesLineView.h" #define KINTERVAL 10//Global pitch @implementation dasheslineview-(ID) i    Nitwithframe: (cgrect) frame{self= [Super Initwithframe:frame];        if (self) {_linecolor = [uicolor Redcolor];        _startpoint = Cgpointmake (0, 1);                    _endpoint = Cgpointmake (screen_width, 1); } return self;}        -(void) DrawRect: (cgrect) Rect {cgcontextref context = Uigraphicsgetcurrentcontext ();        Cgcontextbeginpath (context);        Cgcontextsetlinewidth (context,0.5);//Line width cgcontextsetstrokecolorwithcolor (context,self.linecolor.cgcolor);        CGFloat lengths[] = {4,2};//First draw 4 points and then draw 2 points Cgcontextsetlinedash (context,0, lengths,2);//Note 2 (count) is equal to the length of the lengths array        Cgcontextmovetopoint (CONTEXT,SELF.STARTPOINT.X,SELF.STARTPOINT.Y);        Cgcontextaddlinetopoint (CONTEXT,SELF.ENDPOINT.X,SELF.ENDPOINT.Y);        Cgcontextstrokepath (context);    Cgcontextclosepath (context); } @end

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How IOS implements dashed line drawing