单纯的设置状态栏颜色：

func setStatusBarBackgroundColor(color:UIColor) {
        if #available(iOS 13.0, *) {
            let tag = 987654321
            let keyWindow = UIApplication.shared.connectedScenes.map({ $0 as? UIWindowScene }).compactMap({ $0 }).first?.windows.first
            if let statusBar = keyWindow?.viewWithTag(tag) {
                statusBar.backgroundColor = color
            } else {
                let statusBar = UIView(frame:keyWindow?.windowScene?.statusBarManager?.statusBarFrame ?? CGRect.zero)
                if statusBar.responds(to:#selector(setter: UIView.backgroundColor)) {
                    statusBar.backgroundColor = color
                }
                statusBar.tag = tag
                keyWindow?.addSubview(statusBar)
            }
        } else {
            let statusBar: UIView = UIApplication.shared.value(forKey: "statusBar") as! UIView
            if statusBar.responds(to:#selector(setter: UIView.backgroundColor)) {
                statusBar.backgroundColor = color
            }
        }
    }

如果有获取状态栏背景颜色的需求可以用下面这种方式：

extension UIApplication {
    class var statusBarBackgroundColor: UIColor? {
        get {
            if #available(iOS 13.0, *) {
                let tag = 987654321
                let keyWindow = UIApplication.shared.connectedScenes.map({ $0 as? UIWindowScene }).compactMap({ $0 }).first?.windows.first
                if let statusBar = keyWindow?.viewWithTag(tag) {
                    return statusBar.backgroundColor
                }
                let statusBar = UIView(frame: keyWindow?.windowScene?.statusBarManager?.statusBarFrame ?? CGRect.zero)
                return statusBar.backgroundColor
            } else {
                let statusBar: UIView = UIApplication.shared.value(forKey: "statusBar") as! UIView
                return statusBar.backgroundColor
            }
        }
        set {
            if #available(iOS 13.0, *) {
                let tag = 987654321
                let keyWindow = UIApplication.shared.connectedScenes.map({ $0 as? UIWindowScene }).compactMap({ $0 }).first?.windows.first
                if let statusBar = keyWindow?.viewWithTag(tag) {
                    statusBar.backgroundColor = newValue
                } else {
                    let statusBar = UIView(frame:keyWindow?.windowScene?.statusBarManager?.statusBarFrame ?? CGRect.zero)
                    if statusBar.responds(to:#selector(setter: UIView.backgroundColor)) {
                        statusBar.backgroundColor = newValue
                    }
                    statusBar.tag = tag
                    keyWindow?.addSubview(statusBar)
                }
            } else {
                let statusBar: UIView = UIApplication.shared.value(forKey: "statusBar") as! UIView
                if statusBar.responds(to:#selector(setter: UIView.backgroundColor)) {
                    statusBar.backgroundColor = newValue
                }
            }
        }
    }
}

还可以通过加一个view的方式来改变：

func setStatusBarBackgroundColor(_ color: UIColor?) {
        guard let color = color else {
            return
        }
        let statusBarView = UIView()
        statusBarView.backgroundColor = color
        self.view.addSubview(statusBarView)
        statusBarView.translatesAutoresizingMaskIntoConstraints = false
        statusBarView.topAnchor.constraint(equalTo: self.view.topAnchor).isActive = true
        statusBarView.leadingAnchor.constraint(equalTo: self.view.leadingAnchor).isActive = true
        statusBarView.trailingAnchor.constraint(equalTo: self.view.trailingAnchor).isActive = true
        statusBarView.bottomAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.topAnchor).isActive = true
    }