IOS：如何在 4 侧（上、右、下、左）为 UIView 制作阴影

我正在使用下面的代码为我的阴影制作阴影ImageView

UIBezierPath *shadowPath = [UIBezierPath bezierPathWithRect:self.avatarImageView.bounds];
self.avatarImageView.layer.masksToBounds = NO;
self.avatarImageView.layer.shadowColor = [UIColor blackColor].CGColor;
self.avatarImageView.layer.shadowOffset = CGSizeMake(5.0f, 5.0f);
self.avatarImageView.layer.shadowOpacity = 0.8f;
self.avatarImageView.layer.shadowPath = shadowPath.CGPath;

它会像下图一样在右侧和底部留下阴影。

现在我想做我的ImageView顶部和左侧也有一个阴影。 我应该在代码中更改什么？ 是否可以仅通过代码中的配置使视图在顶部、右侧、底部、左侧包含阴影，或者我需要为阴影创建其他布局视图？任何帮助将不胜感激。

Here is what I want to achieve

Update
Thank @Dipen Panchasara for give a simple solution. Follow @Dipen Panchasara (with the shadow color is black) I will have the shadow image like this

只需以下代码即可满足您的要求，您不需要创建UIBezierPath对于阴影路径。

// *** Set masks bounds to NO to display shadow visible ***
self.avatarImageView.layer.masksToBounds = NO;
// *** Set light gray color as shown in sample ***
self.avatarImageView.layer.shadowColor = [UIColor lightGrayColor].CGColor;
// *** *** Use following to add Shadow top, left ***
self.avatarImageView.layer.shadowOffset = CGSizeMake(-5.0f, -5.0f);

// *** Use following to add Shadow bottom, right ***
//self.avatarImageView.layer.shadowOffset = CGSizeMake(5.0f, 5.0f);

// *** Use following to add Shadow top, left, bottom, right ***
// avatarImageView.layer.shadowOffset = CGSizeZero;
// avatarImageView.layer.shadowRadius = 5.0f;

// *** Set shadowOpacity to full (1) ***
self.avatarImageView.layer.shadowOpacity = 1.0f;