Ios 如何更改此UIBezierPath的箭头方向

我有下面的代码，它绘制了一个圆形的矩形，顶部有一个小的插入符号箭头。我希望能够创建一个方法，根据我指定的内容在顶部、左侧、右侧或底部绘制箭头（我可能会传入一个枚举typedef）

下面是我的代码现在生成的内容：

有谁能帮我使这段代码更加动态/灵活，这样我就可以完成这项任务

        CGContextBeginPath(context);
        CGContextMoveToPoint(context, kBubbleBorderRadius + 0.5f, kCaretHeight + 0.5f);
        CGContextAddLineToPoint(context, round(currentFrame.size.width / 2.0f - (kCaretHeight * 2.0) / 2.0f) + 0.5f, kCaretHeight + 0.5f);
        CGContextAddLineToPoint(context, round(currentFrame.size.width / 2.0f) + 0.5f, 0.5f);
        CGContextAddLineToPoint(context, round(currentFrame.size.width / 2.0f + (kCaretHeight * 2.0) / 2.0f) + 0.5f, kCaretHeight + 0.5f);
        CGContextAddArcToPoint(context, currentFrame.size.width - 0.5f, kCaretHeight + 0.5f, currentFrame.size.width- 0.5f, currentFrame.size.height - 0.5f, kBubbleBorderRadius);
        CGContextAddArcToPoint(context, currentFrame.size.width - 0.5f, currentFrame.size.height - 0.5f, round(currentFrame.size.width / 2.0f + (kCaretHeight * 2.0) / 2.0f) + 0.5f, currentFrame.size.height - 0.5f, kBubbleBorderRadius);
        CGContextAddArcToPoint(context, 0.5f, currentFrame.size.height - 0.5f, 0.5f, kCaretHeight + 0.5f, kBubbleBorderRadius);
        CGContextAddArcToPoint(context, 0.5f, kCaretHeight + 0.5f, currentFrame.size.width - 0.5f, kCaretHeight + 0.5f, kBubbleBorderRadius);
        CGContextClosePath(context);
        CGContextDrawPath(context, kCGPathFill);

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我可以给你一个起点。 首先，我将矩形和箭头分开：

绘制简单矩形：

const CGFloat kRectangleOffset = 5; // This is offset to have some space for arrow

// Draw simple rectangle in DrawRect method
    CGRect frame = CGRectMake(0+kRectangleOffset,
                              0+kRectangleOffset,
                              rect.size.width-kRectangleOffset*2,
                              rect.size.height-kRectangleOffset*2);

    UIBezierPath* rectanglePath = [UIBezierPath bezierPathWithRect: frame];
    [UIColor.grayColor setFill];
    [rectanglePath fill];

添加为子视图f.e:

- (void)viewDidLoad {
    [super viewDidLoad];

    BoxView *box = [[BoxView alloc] initWithFrame:CGRectMake(100, 100, 200, 80)];
    box.backgroundColor = [UIColor redColor]; // I specially set red color to see it's full surface...
    [self.view addSubview:box];
}

然后在矩形的中心绘制简单的箭头

const CGFloat kArrowWidth = 10;

  // Draw Bezier arrow on top consists of 3 points 
    UIBezierPath* bezierPathTop = UIBezierPath.bezierPath;
    [bezierPathTop moveToPoint: CGPointMake(rect.size.width/2-kArrowWidth/2, kRectangleOffset)];
    [bezierPathTop addLineToPoint: CGPointMake(rect.size.width/2+kArrowWidth/2, kRectangleOffset)];
    [bezierPathTop addLineToPoint: CGPointMake(rect.size.width/2, 0)];
    [UIColor.blueColor setFill];
    [bezierPathTop fill];

最后是相同的箭头，但有不同的点位置

UIBezierPath* bezierPathLeft = UIBezierPath.bezierPath;
[bezierPathLeft moveToPoint: CGPointMake(kRectangleOffset, rect.size.height/2-kArrowWidth/2)];
[bezierPathLeft addLineToPoint: CGPointMake(kRectangleOffset, rect.size.height/2+kArrowWidth/2)];
[bezierPathLeft addLineToPoint: CGPointMake(0, rect.size.height/2)];
[UIColor.blueColor setFill];
[bezierPathLeft fill];

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您需要根据箭头方向枚举确定只绘制一个箭头。我希望您能进一步了解此示例

您能提供所需的图形表示吗…@Injectios为问题添加了当前代码生成的图像，谢谢。如果您将三角形与主体分开绘制，会更容易。@thelaws，我同意。在这种情况下，我如何区分方法？