add shimmer to uiview in swift

To add shimmer effect to a UIView in Swift, you can use the FBShimmering library created by Facebook. Follow the steps below to achieve this:

1. Add FBShimmering as a dependency in your project by adding the following line to your Podfile:

   main.swift
   pod 'FBShimmering', '~> 0.3'
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2. Run pod install in the terminal to install the library.

3. Import the library in your file where you want to add the shimmer effect:

   main.swift
   import FBShimmering
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4. Create a UIView instance and add your content/elements to it like any regular view.

5. Create a FBShimmeringView instance and add the content view to it:

   main.swift
   let shimmerView = FBShimmeringView(frame: CGRect(x: 0, y: 0, width: 300, height: 200))
   let contentView = UIView(frame: shimmerView.bounds)
   
   // add your content to the contentView
   // ...
   
   shimmerView.contentView = contentView
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6. Set shimmeringSpeed, shimmeringPauseDuration and shimmeringAnimationOpacity to modify the shimmering parameters:

   main.swift
   shimmerView.shimmeringSpeed = 100
   shimmerView.shimmeringPauseDuration = 0.5
   shimmerView.shimmeringAnimationOpacity = 0.5
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7. Add the shimmerView to your view hierarchy:

   main.swift
   view.addSubview(shimmerView)
   shimmerView.center = view.center
   shimmerView.isShimmering = true
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This will add the shimmer effect to your view. You can further customize the effect by adjusting the parameters or by using FBShimmeringLayer directly.