CAShapeLayer没有圆角，中风不在上面

Question

大家好我创造了这个盒子，基本上角落半径不起作用＆amp;中风也不会出现在形状的顶部。反正有没有让这个工作？

UIBezierPath* conPath = [UIBezierPath bezierPath];
[conPath moveToPoint:CGPointMake(conX, conY)];
[conPath addLineToPoint:CGPointMake(conX, conY+50)];
[conPath addLineToPoint:CGPointMake(conX+220, conY+50)];
[conPath addLineToPoint:CGPointMake(conX+220, conY)];

CAShapeLayer* conLayer = [CAShapeLayer layer];
conLayer.path = conPath.CGPath;
conLayer.cornerRadius = 5.0;
UIColor *bg = [UIColor colorWithWhite:1 alpha:0.7];
[conLayer setFillColor:bg.CGColor];
[conLayer setStrokeColor:[UIColor grayColor].CGColor];
[[self layer] addSublayer:conLayer];