删除UISearchbar左侧的图像

func getSubviews(view: UIView) -> [UIView] {
    var subviews = [UIView]()
    for subview in view.subviews {
        subviews.append(subview)
        subviews.append(contentsOf: getSubviews(view: subview))
    }
    return subviews
}

let searchBar = UISearchBar()
let subviews = getSubviews(view: searchBar)

for subview in subviews {
    if let imageView = subview as? UIImageView, let image = imageView.image {
        if image.size.width == searchBar.height && image.size.height == searchBar.height {
            imageView.removeFromSuperview()
            break
        }
    }
}

extension UISearchBar {
    var searchField: UITextField? {
        return value(forKey: "searchField") as? UITextField
    }

    var searchFieldLeftView: UIView? {
        return searchField?.leftView
    }

    var searchFieldLeftPadding: CGFloat {
        get {
            return searchFieldLeftView?.frame.width ?? 0
        }
        set {
            let leftView = UIView(frame: CGRect(x: 0, y: 0, width: newValue, height: searchField?.frame.height ?? 0))
            searchField?.leftView = leftView
            searchField?.leftViewMode = .always
        }
    }
}

searchBar.searchFieldLeftPadding = 0