1 + (void)drawDashLine:(UIView *)lineView lineLength:(int)lineLength lineSpacing:(int)lineSpacing lineColor:(UIColor *)lineColor 2 { 3     CAShapeLayer *shapeLayer = [CAShapeLayer layer]; 4     [shapeLayer setBounds:lineView.bounds]; 5     [shapeLayer setPosition:CGPointMake(CGRectGetWidth(lineView.frame) / 2, CGRectGetHeight(lineView.frame))]; 6     [shapeLayer setFillColor:[UIColor clearColor].CGColor]; 7     //  設置虛線顏色 8     [shapeLayer setStrokeColor:lineColor.CGColor];     9     //  設置虛線寬度10     [shapeLayer setLineWidth:CGRectGetHeight(lineView.frame)];11     [shapeLayer setLineJoin:kCALineJoinRound];   12     //  設置線寬，線間距13     [shapeLayer setLineDashPattern:[NSArray arrayWithObjects:[NSNumber numberWithInt:lineLength], [NSNumber numberWithInt:lineSpacing], nil]];14     //  設置路徑15     CGMutablePathRef path = CGPathCreateMutable();16     CGPathMoveToPoint(path, NULL, 0, 0);17     CGPathAddLineToPoint(path, NULL, CGRectGetWidth(lineView.frame), 0);   18     [shapeLayer setPath:path];19     CGPathRelease(path);  20     //  把繪制好的虛線添加上來21     [lineView.layer addSublayer:shapeLayer];22 }