一、重写drawRect方法。
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- (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); } |
二、采用CAShapeLayer方式绘制虚线
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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]; |
关于这种方式已经有人整理出了一个非常好用的类方法,具体见下面这段代码，注意：下面非完整代码，如有需要，请自己百度搜索。
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/** ** 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]; } |
三、经济实惠型：采用贴图的方式绘制虚线（需要设计师切图配合）
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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]; |
总结
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