一、重寫drawRect方法。
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- (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(shù)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(shù)“2”代表排列的個數(shù)。 CGContextSetLineDash(currentContext, 0, arr, 2); CGContextDrawPath(currentContext, kCGPathStroke); } |
二、采用CAShapeLayer方式繪制虛線
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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];//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(jīng)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。
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/** ** 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(jīng)濟實惠型：采用貼圖的方式繪制虛線（需要設計師切圖配合）
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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]; |
總結
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