向UIBezierPath addArc函数添加箭头端

UIBezierPath *path = [UIBezierPath bezierPath];

// 移动到箭头的起始位置
CGPoint startPoint = CGPointMake(startX, startY);
[path moveToPoint:startPoint];

// 添加圆弧
CGPoint center = CGPointMake(arcCenterX, arcCenterY);
CGFloat radius = arcRadius;
CGFloat startAngle = arcStartAngle;
CGFloat endAngle = arcEndAngle;
BOOL clockwise = YES;
[path addArcWithCenter:center radius:radius startAngle:startAngle endAngle:endAngle clockwise:clockwise];

// 绘制箭头的两条线段
CGPoint arrowPoint1 = CGPointMake(arrowX1, arrowY1);
CGPoint arrowPoint2 = CGPointMake(arrowX2, arrowY2);
[path addLineToPoint:arrowPoint1];
[path moveToPoint:startPoint];
[path addLineToPoint:arrowPoint2];

// 闭合路径
[path closePath];

// 可以将path添加到CAShapeLayer中进行显示
CAShapeLayer *shapeLayer = [CAShapeLayer layer];
shapeLayer.path = path.CGPath;
shapeLayer.strokeColor = [UIColor blackColor].CGColor;
shapeLayer.fillColor = [UIColor clearColor].CGColor;
[self.view.layer addSublayer:shapeLayer];