有時候需要在視圖上添加虛線的分割線，要么讓美工切圖，要么就使用代碼，在網上找到一種別人寫的繪制虛線的方法，分享一下。

/**
 ** 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 setBounds:lineView.bounds];
    [shapeLayer setPosition:CGPointMake(CGRectGetWidth(lineView.frame) / 2, CGRectGetHeight(lineView.frame))];
    [shapeLayer setFillColor:[UIColor clearColor].CGColor];
    //  設置虛線顏色為blackColor
    [shapeLayer setStrokeColor:lineColor.CGColor];
    //  設置虛線寬度
    [shapeLayer setLineWidth:CGRectGetHeight(lineView.frame)];
    [shapeLayer setLineJoin:kCALineJoinRound];
    //  設置線寬，線間距
    [shapeLayer setLineDashPattern:[NSArray arrayWithObjects:[NSNumber numberWithInt:lineLength], [NSNumber numberWithInt:lineSpacing], nil]];
    //  設置路徑
    CGMutablePathRef path = CGPathCreateMutable();
    CGPathMoveToPoint(path, NULL, 0, 0);
    CGPathAddLineToPoint(path, NULL,CGRectGetWidth(lineView.frame), 0);
    [shapeLayer setPath:path];
    CGPathRelease(path);
    //  把繪制好的虛線添加上來
    [lineView.layer addSublayer:shapeLayer];
}