- (void)drawRect:(CGRect)rect
{
 [super drawRect:rect];
CGContextRef currentContext = UIGraphicsGetCurrentContext();
//設置虛線顏色
 CGContextSetStrokeColorWithColor(currentContext, [UIColor BlackColor].CGColor);
 //設置虛線寬度
 CGContextSetLineWidth(currentContext, 1);
 //設置虛線繪制起點
 CGContextMoveToPoint(currentContext, 0, 0);
 //設置虛線繪制終點
 CGContextAddLineToPoint(currentContext, self.frame.origin.x + self.frame.size.width, 0);
 //設置虛線排列的寬度間隔:下面的arr中的數字表示先繪制3個點再繪制1個點
 CGFloat arr[] = {3,1};
 //下面最后一個參數“2”代表排列的個數。
 CGContextSetLineDash(currentContext, 0, arr, 2);
 CGContextDrawPath(currentContext, kCGPathStroke);
 
}

二、采用CAShapeLayer方式繪制虛線

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];
//設置虛線顏色
shapeLayer setStrokeColor:[UIColor BlackColor].CGColor];
//設置虛線寬度
[shapeLayer setLineWidth:self.frame.size.height];
[shapeLayer setLineJoin:kCALineJoinRound];
//設置虛線的線寬及間距
 [shapeLayer setLineDashPattern:[NSArray arrayWithObjects:[NSNumber numberWithInt:3], [NSNumber numberWithInt:1], nil]];
 //創(chuàng)建虛線繪制路徑
 CGMutablePathRef path = CGPathCreateMutable();
 //設置虛線繪制路徑起點
 CGPathMoveToPoint(path, NULL, 0, 0);
 //設置虛線繪制路徑終點
 CGPathAddLineToPoint(path, NULL, self.frame.size.width, 0);
 //設置虛線繪制路徑
 [shapeLayer setPath:path];
 CGPathRelease(path);
 //添加虛線
 [self.layer addSublayer:shapeLayer];

關于這種方式已經有人整理出了一個非常好用的類方法,具體見下面這段代碼，注意：下面非完整代碼，如有需要，請自己百度搜索。

/**
 ** lineView:  需要繪制成虛線的view
 ** lineLength:  虛線的寬度
 ** lineSpacing: 虛線的間距
 ** lineColor:  虛線的顏色
 **/
 
+ (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、經濟實惠型：采用貼圖的方式繪制虛線（需要設計師切圖配合）

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];

總結

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