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I have created a custom UIView in my iOS project that has a drop shadow. My aim is to apply the same gradient to the shadow as it is on the view's background.
Below is an example of how my current solid colour shadows look.
This is done through a subclass of UIView with the below code:
override func layoutSubviews() {
let gradientLayer = layer as! CAGradientLayer
gradientLayer.colors = [topColor.cgColor, bottomColor.cgColor]
gradientLayer.startPoint = CGPoint(x: startPointX, y: startPointY)
gradientLayer.endPoint = CGPoint(x: endPointX, y: endPointY)
layer.cornerRadius = cornerRadius
layer.shadowColor = shadowColor.cgColor
layer.shadowOffset = CGSize(width: shadowX, height: shadowY)
layer.shadowRadius = shadowBlur
layer.shadowOpacity = 1
let inset: CGFloat = bounds.width * 0.05
layer.shadowPath = UIBezierPath(roundedRect: bounds.insetBy(dx: inset, dy: 0.0), cornerRadius: cornerRadius).cgPath
}
I have been playing around with creating a second gradient layer and masking it to the shadow but have had no luck. Please point me in the right direction!
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Now, if we want to add a gradient-y box shadow behind this box, we can do it using a ::before pseudo-element around it and makes it looks like a shadow. As you can tell, since we want a gradient shadow, we're using linear-gradient as the background of the pseudo-element.
Approach: Here are the steps required to get the desired linear-gradient shadow: Make an HTML file, with the button, card, banner or the thing that you want to make shadow of. Make a pseudo class in stylesheet and make the position absolute of the pseudo class relative to the parent element.
There are many ways to create background gradients, below is just one simple approach: In a new Xcode iOS project, open Main. storyboard, from the Object Library drag a new View onto the View Controller. Set the View's top, bottom, left and right constraints to be zero and ensure 'Constrain to margins' is deselected.
Creating a layer with gradient colors is quite simple. For the most basic gradient, it only requires the colors you want to use, and then you can optionally adjust color location. Once you've created your gradient, add it simply to your view layer by calling the addSublayer function.
I think you can't do more with standard CALayer shadow. Take a look at filters property of CALayer.
https://developer.apple.com/documentation/quartzcore/calayer/1410901-filters
Create second CAGradientLayer and apply a GausianBlur filter for example.
https://developer.apple.com/library/content/documentation/GraphicsImaging/Reference/CoreImageFilterReference/index.html#//apple_ref/doc/filter/ci/CIGaussianBlur
Disable standard layer shadows and add your blurred layer as sublayer.
91
Use my code for your requirement available in my gitRepo https://github.com/Krishnarjun-Banoth/BlurView/tree/master/Shadows
Step1: Just drag and drop BlurEffect.swift file in your project.
Step2: Then simply Use below View extension methods for each one your views individually.
testView.applyGradient(colours: [UIColor.blue,UIColor.orange]) //pass your required colours.
testView.blur(blurRadius: 5.0)
Note: Inspired from @Jacek Głazik answer and FlexMonkey's tutorial.
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