陰影的顏色：

view.layer.shadowColor =[UIColor grayColor].CGColor;

陰影透明度:

view.layer.shadowOpacity = 0.4f;

陰影的圓角:

view.layer.shadowRadius = 4.f;

陰影的偏移量:

view.layer.shadowOffset = CGSizeMake(0,0);

路徑陰影:

UIBezierPath *path = [UIBezierPath bezierPath];

[path moveToPoint:CGPointMake(-5, -5)];

添加直線:

[path addLineToPoint:CGPointMake(paintingWidth /2, -15)];

[path addLineToPoint:CGPointMake(paintingWidth +5, -5)];

[path addLineToPoint:CGPointMake(paintingWidth +15, paintingHeight /2)];

[path addLineToPoint:CGPointMake(paintingWidth +5, paintingHeight +5)];

[path addLineToPoint:CGPointMake(paintingWidth /2, paintingHeight +15)];

[path addLineToPoint:CGPointMake(-5, paintingHeight +5)];

[path addLineToPoint:CGPointMake(-15, paintingHeight /2)];

[path addLineToPoint:CGPointMake(-5, -5)];

設(shè)置陰影路徑:

view.layer.shadowPath = path.CGPath;