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);
}
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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];
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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];
}
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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];
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总结
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