我想用特定的视图控制器更改状态栏颜色。
根据StackOverFlow的回答,我实现了它。
有一个问题,当在iPhone上切换应用程序时,我设置的颜色会消失,然后回到初始状态。
没关系。请注意状态栏。
不好。请注意状态栏。
statusBar.backgroundColor
,
UIView *statusBar = [[[UIApplication sharedApplication] valueForKey:@"statusBarWindow"] valueForKey:@"statusBar"];
if ([statusBar respondsToSelector:@selector(setBackgroundColor:)]) {
statusBar.backgroundColor = [UIColor redColor ];
}
2.将子视图插入statusBar。
UIView *statusBar = [[[UIApplication sharedApplication] valueForKey:@"statusBarWindow"] valueForKey:@"statusBar"];
UIView * backgroundColorView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 375, 20) ];
backgroundColorView.autoresizingMask = UIViewAutoresizingFlexibleWidth;
backgroundColorView.backgroundColor = [UIColor redColor ];
[statusBar.subviews.firstObject insertSubview: backgroundColorView atIndex:0];
3.插入图层(CALayer)也是如此。
我试图用断点来分析它。
- 当应用程序处于活动状态时,双击“主页”按钮切换应用程序,该方法不会被称为- (void)viewWillDisappear:(BOOL)animated
。这让我有点困惑。
- 我尝试在应用程序的方法- (void)applicationWillResignActive:(UIApplication *)application
中更改状态栏的背景颜色,它不起作用。我不知道为什么。
从Github的源代码来看,通过Runtime可以。我的公司不喜欢使用Runtime。
没有运行时还有其他方法吗?
而且我不知道运行时如何与iPhone的切换应用程序模式进行交互。
主要问题是在没有运行时解决它。欢迎提供更多解释。我觉得很容易,我想念什么?
非常感谢先进。
Swift 4的答案:
它适合由navigationViewController管理的viewControllers的情况
class ViewController: UIViewController {
let statusBarBgView = { () -> UIView in
let statusBarWindow: UIView = UIApplication.shared.value(forKey: "statusBarWindow") as! UIView
let statusBarBgView = UIView(frame: (statusBarWindow.statusBar?.bounds)!)
return statusBarBgView
}()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
UIApplication.shared.statusBarStyle = .lightContent
let navigationBar = self.navigationController?.navigationBar
self.statusBarBgView.backgroundColor = UIColor.red
navigationBar?.superview?.insertSubview(self.statusBarBgView, aboveSubview: navigationBar!)
}
override func viewWillDisappear(_ animated: Bool) {
self.statusBarBgView.removeFromSuperview()
super.viewWillDisappear(animated)
}
}
extension UIView {
var statusBar: UIView? {
return value(forKey: "statusBar") as? UIView
}
}
Objective-C版本的答案:
-(void)viewWillAppear:(BOOL)animated{
[super viewWillAppear: animated];
[UIApplication sharedApplication].statusBarStyle=UIStatusBarStyleLightContent;
UINavigationBar *navigationBar = self.navigationController.navigationBar;
UIView *statusBar = [[[UIApplication sharedApplication] valueForKey:@"statusBarWindow"] valueForKey:@"statusBar"];
self.statusBarBgView = [[UIView alloc ] initWithFrame: statusBar.bounds ];
self.statusBarBgView.backgroundColor = [UIColor redColor ];
[navigationBar.superview insertSubview: self.statusBarBgView aboveSubview: navigationBar];
}
- (void)viewWillDisappear:(BOOL)animated {
[self.statusBarBgView removeFromSuperview ];
[super viewWillDisappear:animated];
}
显示OS信息的状态栏是UIWindow,在应用程序切换器窗口中由操作系统控制。
UIView *statusBar = [[[UIApplication sharedApplication]
valueForKey:@"statusBarWindow"] valueForKey:@"statusBar"];
因此,当在应用程序切换器窗口中更改视图时,可以调整状态栏位置的背景颜色。
从以前的答案修改:
struct Utility {
static var statusBarBgView = { () -> UIView in
let statusBarBgView = UIView(frame: UIApplication.shared.statusBarFrame)
return statusBarBgView
}()
}
extension UIViewController {
func setupStatusBar(statusBarBgView: inout UIView) {
UIApplication.shared.statusBarStyle = .lightContent
statusBarBgView.backgroundColor = .red
let navigationBar = self.navigationController?.navigationBar
UIApplication.shared.keyWindow!.insertSubview(statusBarBgView, aboveSubview: navigationBar!)
}
}
// Usage:
self.setupStatusBar(statusBarBgView: &Utility.statusBarBgView)