iOS-手绘点(类似分段选择器下方突出的小三角)

UIBezierPath *path = [UIBezierPath bezierPath];

CGFloat width = 150.f;

CGFloat height = self.tableView.height;

CGFloat x = (self.width - width) / 2;

CGFloat y = 64.5f;

CGFloat arrowHeight = 5.f;

CGFloat arrowWidth = 10.f;

[path moveToPoint:CGPointMake(x, y)];

[path addLineToPoint:CGPointMake(self.centerX - arrowWidth / 2, y)];

[path addLineToPoint:CGPointMake(self.centerX, y - arrowHeight)];

[path addLineToPoint:CGPointMake(self.centerX + arrowWidth / 2, y)];

[path addLineToPoint:CGPointMake(x + width, y)];

[path addLineToPoint:CGPointMake(x + width, y + height)];

[path addLineToPoint:CGPointMake(x, y + height)];

[path closePath];

CAShapeLayer *layer = [CAShapeLayer layer];

layer.shadowColor = [UIColor purpleColor].CGColor;

layer.shadowOpacity = 0.4;

layer.shadowRadius = 10;

layer.strokeColor = [UIColor colorWithRed:234.0/255 green:84.0/255 blue:87.0/255 alpha:1].CGColor;

layer.fillColor = [UIColor whiteColor].CGColor;

layer.frame = self.bounds;

layer.path = path.CGPath;

[self.layer insertSublayer:layer atIndex:0];

self.shapeLayer = layer;