xcode iOS 中 ImageView 上的阴影效果
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Shadow effects on ImageView in iOS
提问by Shikhar varshney
I am trying to provide a shadow effect to my Imageview just like in this image.
我正在尝试为我的 Imageview 提供阴影效果，就像在这张图片中一样。
but the problem which I am facing it is that the shadow is actually visible from the bottom of the Imageview.
但我面临的问题是从 Imageview 的底部实际上可以看到阴影。
Here is the code which I have done to add the shadow. The color and all is still not matching with this one.
这是我为添加阴影所做的代码。颜色和所有仍然与这个不匹配。
CAGradientLayer *shadow = [CAGradientLayer layer];
shadow.frame = CGRectMake(-100, 70, perspectiveView.frame.size.width,
perspectiveView.frame.size.height - 20);
shadow.startPoint = CGPointMake(1.0, 0.5);
shadow.endPoint = CGPointMake(0, 0.5);
shadow.colors = [NSArray arrayWithObjects:(id)[[UIColor colorWithWhite:0.0
alpha:0.4f] CGColor], (id)[[UIColor clearColor] CGColor], nil];
shadow.opacity = 1.0f;
[perspectiveView.layer addSublayer:shadow];
Please provide inputs. Also if the approach is wrong, feel free to guide me to any other approach. Thanks in advance.
请提供输入。此外，如果方法错误，请随时指导我使用任何其他方法。提前致谢。
Also can anyone suggest how to provide a 3D border just like in the image which provides a slight width to the image view?
也有人可以建议如何提供 3D 边框，就像在图像中为图像视图提供轻微宽度的图像一样？
回答by GenieWanted
Perhaps, adding a shadow to the layer seems to work. You may want to try something like this:
也许，向图层添加阴影似乎有效。你可能想尝试这样的事情：
// perspectiveView.transform = CGAffineTransformMakeRotation(-50.0f);
perspectiveView.layer.shadowOffset = CGSizeMake(10, 10);
perspectiveView.layer.shadowRadius = 5.0;
perspectiveView.layer.shadowOpacity = 0.6;
perspectiveView.layer.masksToBounds = NO;
You will need to playaround with these values to match your requirements. Hope this helps.
您将需要使用这些值来满足您的要求。希望这可以帮助。
Here is my output:
这是我的输出：
回答by Neenu
Try this,
尝试这个，
- (void)setShadow {
[perspectiveView.layer setShadowOffset:CGSizeMake(-5.0, 5.0)];
[perspectiveView.layer setShadowRadius:5.0];
[perspectiveView.layer setShadowOpacity:1.0];
}
回答by Anurag Bhakuni
you can use CALayerclass , the layer can manage your visual aspects like background color, border, shadow and with it you can also manage the geometry of it content like size , transform etc .
您可以使用CALayerclass ，图层可以管理您的视觉方面，如背景颜色、边框、阴影，并且您还可以管理它的几何内容，如大小、变换等。
visual effect(shadowing)
视觉效果（阴影）
self.yourView.layer.shadowOffset = CGSizeMake(0, 3);
self.yourView.layer.shadowRadius = 5.0;
self.yourView.layer.shadowColor = [UIColor blackColor].CGColor;
self.yourView.layer.shadowOpacity = 1;
and you also used it for like self.yourView.layer.frame(Geometry)
你也用它来做self.yourView.layer.frame（几何）
回答by Lalji
Below code work i have checked properly.
下面的代码工作我已经正确检查。
but Shikhar varshneycan u check setShadow method call and perspectiveView is not nil.
但是Shikhar varshney可以检查 setShadow 方法调用并且透视视图不是零。
- (void)setShadow {
perspectiveView.layer.shadowColor = [UIColor colorWithWhite:0.0
alpha:0.4f] CGColor;
perspectiveView.layer.shadowOffset = CGSizeMake(0, 1);
perspectiveView.layer.shadowOpacity = 1;
perspectiveView.layer.shadowRadius = 1.0;
perspectiveView.clipsToBounds = NO;
}
