1. 改变状态栏颜色

override var preferredStatusBarStyle: UIStatusBarStyle {
    return .lightContent
}

//修改状态栏背景颜色
func setStatusBarBackgroundColor(color: UIColor) {
    guard let statusBar = UIApplication.shared.value(forKeyPath: "statusBarWindow.statusBar") as? UIView else { return }
    statusBar.backgroundColor = color
}