iOS之绘制虚线

 1 /*
 2   ** lineFrame:     虚线的 frame
 3   ** length:        虚线中短线的宽度
 4   ** spacing:       虚线中短线之间的间距
 5   ** color:         虚线中短线的颜色
 6 */
 7 + (UIView *)createDashedLineWithFrame:(CGRect)lineFrame
 8                            lineLength:(int)length
 9                           lineSpacing:(int)spacing
10                             lineColor:(UIColor *)color{
11     UIView *dashedLine = [[UIView alloc] initWithFrame:lineFrame];
12     dashedLine.backgroundColor = [UIColor clearColor];
13     CAShapeLayer *shapeLayer = [CAShapeLayer layer];
14     [shapeLayer setBounds:dashedLine.bounds];
15     [shapeLayer setPosition:CGPointMake(CGRectGetWidth(dashedLine.frame) / 2, CGRectGetHeight(dashedLine.frame))];
16     [shapeLayer setFillColor:[UIColor clearColor].CGColor];
17     [shapeLayer setStrokeColor:color.CGColor];
18     [shapeLayer setLineWidth:CGRectGetHeight(dashedLine.frame)];
19     [shapeLayer setLineJoin:kCALineJoinRound];
20     [shapeLayer setLineDashPattern:[NSArray arrayWithObjects:[NSNumber numberWithInt:length], [NSNumber numberWithInt:spacing], nil]];
21     CGMutablePathRef path = CGPathCreateMutable();
22     CGPathMoveToPoint(path, NULL, 0, 0);
23     CGPathAddLineToPoint(path, NULL, CGRectGetWidth(dashedLine.frame), 0);
24     [shapeLayer setPath:path];
25     CGPathRelease(path);
26     [dashedLine.layer addSublayer:shapeLayer];
27     return dashedLine;
28 }