- 配置项(info.plist)
<key>UIViewControllerBasedStatusBarAppearance</key>
<true/>
Apps default to using the new view controller-based status bar >management system. To opt out of this, add a value of NO for the UIViewControllerBasedStatusBarAppearance key to your Info.plist.
UIViewControllerBasedStatusBarAppearance默认是true
当UIViewControllerBasedStatusBarAppearance == true的时候，ViewController和NavigationController才能对StatueBar的前景样式进行更改。
当UIViewControllerBasedStatusBarAppearance == false的时候，需要Application级别对其进行修改才能生效。
Applicaiton级别的两种修改方式
- info.plist（当然这里可以直接在xcode->target->deployinfo->statue bar style中直接设置）
<key>UIStatusBarStyle</key>
<string>UIStatusBarStyleLightContent</string>
- UIAplication
//9以后被遗弃了
application.setStatusBarStyle(.default, animated: false)
-
ViewController中对StatueBar进行修改
在ViewController中重写相应的方法并调用需要更新
override var preferredStatusBarStyle: UIStatusBarStyle{
return .lightContent
}
override var prefersStatusBarHidden: Bool{
return true
}
override func viewDidLoad() {
super.viewDidLoad()
//通知系统咱需要更新状态栏
self.setNeedsStatusBarAppearanceUpdate()
}
完成了上一步后，重写的两个方法没有导航的情况下是可以的。可是一但加了导航NavigationController，self.setNeedsStatusBarAppearanceUpdate()之后，系统会调用导航控制器中的preferredStatusBarStyle和prefersStatusBarHidden。所以，还需要继承导航控制器并重写相应的方法：
class BearNavigationViewController: UINavigationController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
//就是这两个方法
override var childViewControllerForStatusBarStyle: UIViewController?{
return self.topViewController
}
override var childViewControllerForStatusBarHidden: UIViewController?{
return self.topViewController
}
}
