self.bgView.layer.shadowOffset = CGSizeMake(1,1);
    self.bgView.layer.shadowOpacity = 0.3;
    self.bgView.layer.shadowColor = [UIColor lightGrayColor].CGColor;

添加阴影效果

添加阴影效果方法二

// 以下是添加的阴影效果
    view.layer.shadowColor = color.CGColor;//shadowColor阴影颜色
    view.layer.shadowOffset = CGSizeMake(0,1);//shadowOffset阴影偏移,x向右偏移4，y向下偏移4，默认(0, -3),这个跟shadowRadius配合使用
    view.layer.shadowOpacity = 0.2;//阴影透明度，默认0
    view.layer.shadowRadius = 2;//阴影半径，默认3
    UIBezierPath * path = [UIBezierPath bezierPath];
    float width = view.bounds.size.width;
    float height = view.bounds.size.height;
    float x = view.bounds.origin.x;
    float y = view.bounds.origin.y;
    float addWH = 2;
    
    CGPoint topLeft      = view.bounds.origin;
    CGPoint topMiddle = CGPointMake(x+(width/2),y-addWH);
    CGPoint topRight     = CGPointMake(x+width,y);
    
    CGPoint rightMiddle = CGPointMake(x+width+addWH,y+(height/2));
    
    CGPoint bottomRight  = CGPointMake(x+width,y+height);
    CGPoint bottomMiddle = CGPointMake(x+(width/2),y+height+addWH);
    CGPoint bottomLeft   = CGPointMake(x,y+height);
    
    
    CGPoint leftMiddle = CGPointMake(x-addWH,y+(height/2));
    
    [path  moveToPoint:topLeft];
    [path addQuadCurveToPoint:topRight
                 controlPoint:topMiddle];
    [path addQuadCurveToPoint:bottomRight
                 controlPoint:rightMiddle];
    [path addQuadCurveToPoint:bottomLeft
                 controlPoint:bottomMiddle];
    [path addQuadCurveToPoint:topLeft
                 controlPoint:leftMiddle];
    
    view.layer.shadowPath = path.CGPath;

可以根据自己的需求来为view 添加阴影效果