Draw a dashed line

Draw a dashed line, this method can be written into the classification of UIImage, directly written as a class method call.

1-(UIImage *) Drawdashimagewithframe: (CGRect) frame andlinecolor: (Uicolor *) LineColor2 {3     //turn on the graphics context4 Uigraphicsbeginimagecontext (frame.size);5     6     //Get Context7Cgcontextref Cxtref =Uigraphicsgetcurrentcontext ();8     9     //set the thread head styleTen Cgcontextsetlinecap (Cxtref, kcglinecapround); One      A     //Draw 3 points, skip 2 points, draw 3 points, skip 3 points, draw 2 points, so repeat -     //cgfloat lengths[] = {3,2,3}; -     //6 is the length of each dashed line, and 5 is the interval between dashes theCGFloat lengths[] = {6,5}; -      -     //Set line width (extend to both sides) -Cgcontextsetlinewidth (Cxtref,1); +      -     //set line Rendering color + [LineColor Setstroke]; A      at     //draw a dashed line -     //Parameter 2: How many points to skip when drawing first -     //parameter 3: Array -     //parameter 4: array length -Cgcontextsetlinedash (Cxtref,0, lengths,2); -      in     //start Drawing line-Starting point -Cgcontextmovetopoint (Cxtref,0.0,0.0); to      +     //Harness Draw Line-end point -Cgcontextaddlinetopoint (Cxtref, [UIScreen mainscreen].bounds.size.width,0.0); the      *     //Set Strokes $ Cgcontextstrokepath (cxtref);Panax Notoginseng      -     //get a picture from the graphics context theUIImage *img =Uigraphicsgetimagefromcurrentimagecontext (); +      A     //Close the graphics context the Uigraphicsendimagecontext (); +      -     returnimg; $}

Draw a dashed line