iOS 状态栏的动态隐藏和显示

效果如下：

QQ20190715-101449.gif

1.首先在plist设置里添加属性：View controller-based status bar appearance 设置为YES。

image.png

2.在需要实现动态控制状态栏的地方添加如下代码：

class ViewController: UIViewController {
    ///记录状态栏切换布尔值
    var isShow = false
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
    }
    
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        if self.isShow {
            self.isShow = false
        } else {
            self.isShow = true
        }
        self.setNeedsStatusBarAppearanceUpdate()
        /// Call this method if the view controller's status bar attributes, such as hidden/unhidden status or style, change. If you call this method within an animation block, the changes are animated along with the rest of the animation block.
如果视图控制器的状态栏属性（例如隐藏/取消隐藏状态或样式）发生更改，请调用此方法。如果在动画块中调用此方法，则会将更改与动画块的其余部分一起设置动画。
    }
    
    override var prefersStatusBarHidden: Bool {
        return isShow
    }
}

此方法setNeedsStatusBarAppearanceUpdate()为UIViewController自带方法用来控制状态栏外观属性更新。