IOS绘制虚线的方法总结

- (void)drawRect:(CGRect)rect{ [super drawRect:rect];CGContextRef currentContext = UIGraphicsGetCurrentContext();//设置虚线颜色 CGContextSetStrokeColorWithColor(currentContext, [UIColor BlackColor].CGColor); //设置虚线宽度 CGContextSetLineWidth(currentContext, 1); //设置虚线绘制起点 CGContextMoveToPoint(currentContext, 0, 0); //设置虚线绘制终点 CGContextAddLineToPoint(currentContext, self.frame.origin.x + self.frame.size.width, 0); //设置虚线排列的宽度间隔:下面的arr中的数字表示先绘制3个点再绘制1个点 CGFloat arr[] = {3,1}; //下面最后一个参数“2”代表排列的个数。 CGContextSetLineDash(currentContext, 0, arr, 2); CGContextDrawPath(currentContext, kCGPathStroke); }

CAShapeLayer *shapeLayer = [CAShapeLayer layer];[shapeLayer setBounds:self.bounds];[shapeLayer setPosition:CGPointMake(self.frame.size.width / 2.0, self.frame.size.height)];[shapeLayer setFillColor:[UIColor clearColor].CGColor];//设置虚线颜色shapeLayer setStrokeColor:[UIColor BlackColor].CGColor];//设置虚线宽度[shapeLayer setLineWidth:self.frame.size.height];[shapeLayer setLineJoin:kCALineJoinRound];//设置虚线的线宽及间距 [shapeLayer setLineDashPattern:[NSArray arrayWithObjects:[NSNumber numberWithInt:3], [NSNumber numberWithInt:1], nil]]; //创建虚线绘制路径 CGMutablePathRef path = CGPathCreateMutable(); //设置虚线绘制路径起点 CGPathMoveToPoint(path, NULL, 0, 0); //设置虚线绘制路径终点 CGPathAddLineToPoint(path, NULL, self.frame.size.width, 0); //设置虚线绘制路径 [shapeLayer setPath:path]; CGPathRelease(path); //添加虚线 [self.layer addSublayer:shapeLayer];

/** ** lineView:  需要绘制成虚线的view ** lineLength:  虚线的宽度 ** lineSpacing: 虚线的间距 ** lineColor:  虚线的颜色 **/ + (void)drawDashLine:(UIView *)lineView lineLength:(int)lineLength lineSpacing:(int)lineSpacing lineColor:(UIColor *)lineColor{ CAShapeLayer *shapeLayer = [CAShapeLayer layer]; ..... [shapeLayer setStrokeColor:lineColor.CGColor]; ...... [shapeLayer setLineDashPattern:[NSArray arrayWithObjects:[NSNumber numberWithInt:lineLength], [NSNumber numberWithInt:lineSpacing], nil]]; 　...... [lineView.layer addSublayer:shapeLayer]; }

UIImageView *imgDashLineView =[[UIImageView alloc] initWithFrame:CGRectMake(15, 200, self.view.frame.size.width - 30, 1)];[imgDashLineView setBackgroundColor:[UIColor colorWithPatternImage:[UIImage imageNamed:@"xuxian.png"]]];[self.view addSubview:imgDashLineView];