Cannot change search bar background color

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Like @aliamcami, all the answers before did not work as I would expect, either the answer did not work for me or it works but it needs too much “dummy” code. So I share another answer wrote in Swift 4 with simplified logic:

for textField in searchController.searchBar.subviews.first!.subviews where textField is UITextField {
    textField.subviews.first?.backgroundColor = .white
    textField.subviews.first?.layer.cornerRadius = 10.5 //I set 10.5 because is approximately the system value
    textField.subviews.first?.layer.masksToBounds = true
    //Continue changing more properties...
}

textField.subviews.first is the “_UISearchBarSearchFieldBackgroundView” subview which add visual effects behind the UIFieldEditor.

Edited

After some development and many bugs, I finished with this elegant solution (that I am sure Apple would not be happy to approve, but I do not know) that works from iOS 10 to iOS 12:

if let textField = searchBar.value(forKey: "searchField") as? UITextField {
    textField.backgroundColor = myColor
    //textField.font = myFont
    //textField.textColor = myTextColor
    //textField.tintColor = myTintColor
    // And so on...
    
    let backgroundView = textField.subviews.first
    if #available(iOS 11.0, *) { // If `searchController` is in `navigationItem`
        backgroundView?.backgroundColor = UIColor.white.withAlphaComponent(0.3) //Or any transparent color that matches with the `navigationBar color`
        backgroundView?.subviews.forEach({ $0.removeFromSuperview() }) // Fixes an UI bug when searchBar appears or hides when scrolling
    }
    backgroundView?.layer.cornerRadius = 10.5
    backgroundView?.layer.masksToBounds = true
    //Continue changing more properties...
}

When the searchBar is in the tableHeaderView the above code can be called in viewWillAppear, but if it is in the navigationItem on iOS 11 and above it should be called in viewDidAppear.

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