IOS 给cell 中的view设置部分圆角

- (void)layoutSublayersOfLayer:(CALayer *)layer {
    //使用masonry加
    [_chatBackView layoutIfNeeded];
    
    //防止复用重复添加layer
    for (CALayer *layer in _chatBackView.layer.sublayers) {
        if ([layer.name isEqualToString:@"lit"]) {
            [layer removeFromSuperlayer];
        }
    }
    
    UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:_chatBackView.bounds byRoundingCorners:UIRectCornerBottomLeft|UIRectCornerTopRight cornerRadii:CGSizeMake(10, 10)];

    CAShapeLayer *shapeLayer = [CAShapeLayer layer];
    shapeLayer = [CAShapeLayer layer];
    shapeLayer.path = maskPath.CGPath;
    _chatBackView.layer.mask = shapeLayer;

    CAShapeLayer *borderLayer=[CAShapeLayer layer];
    borderLayer.path = maskPath.CGPath;
    borderLayer.fillColor = [UIColor clearColor].CGColor;
    borderLayer.strokeColor = _borderColor.CGColor;
    borderLayer.lineWidth = 2;
    borderLayer.frame = _chatBackView.bounds;
    [borderLayer setName:@"lit"];
    [_chatBackView.layer addSublayer:borderLayer];
}