iOS - Streamline the process of iterating through subviews and retrieving a specific subset of UIViews

Exploring the implementation of a CSS selector traversal technique in Swift.

Here's what I have so far:

var CLASSNAME_HANDLE: UInt8 = 0
extension UIView {
    @IBInspectable var className: String {
        get {
           //code to get className
        }
        set {
          //code to set className
        }
    }

    func getViewsByClass(cls: String) -> Array<UIView>{
        //code to get views by class
    }

    func selectViews(filter:(UIView) -> Bool) -> Array<UIView>{
       //code for selecting views
    }

}

extension Array {
    //code for forEach function
}

Now, I am able to include a className property in the interface builder like this: https://i.sstatic.net/N3HiU.png

Everything seems to be functioning correctly, but I believe there is room for performance improvement.

Q: How can I optimize this code? Is there a more efficient way to iterate through subviews and return a filtered subset?

I welcome any suggestions or advice :)

Answer №1

It seems like your code is already optimized for speed in most scenarios. If you're looking to further enhance performance, one option is to pre-calculate the results. For example, each UIView could maintain a Dictionary with the class name as the key and an Array of UIViews that belong to that class as descendants.

To achieve this, you could implement UIView notifications to track when a subview is added or removed. This information would need to be propagated up to the topmost superview, enabling faster retrievals at the expense of slower insertions and deletions.

However, directly implementing this functionality within UIView may require swizzling.

An alternative approach could involve storing a large global dictionary outside of any specific UIView to track all UIViews in the system.

While this approach may seem unconventional, it offers a way to potentially optimize the computation process without suggesting it as a definitive solution.

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