UIViewController中的applicationDidBecomeActive？ [英] applicationDidBecomeActive in UIViewController?

问题描述

当应用程序变为活动状态时，会调用 applicationDidBecomeActive 方法，有没有办法可以为某个UIViewController执行此方法？我知道视图控制器有 viewDidAppear 但是我正在搜索当应用再次变为活动状态并且在某个UIViewController上时调用的方法。我怎样才能实现这个目标？

The applicationDidBecomeActive method gets called when the app became active, is there a way that I can do this method for a certain UIViewController? I know there is viewDidAppear for view controllers but I'm searching for a method that is called when the app becomes active again AND is on a certain UIViewController. How can I achieve this?

推荐答案

您可以收听 UIApplicationDidBecomeActiveNotification 通知：

@implementation CertainViewController

- (void)viewWillAppear:(BOOL)animated {
  [super viewWillAppear:animated];
  [[NSNotificationCenter defaultCenter]
   addObserver:self
   selector:@selector(applicationDidBecomeActiveNotification:)
   name:UIApplicationDidBecomeActiveNotification
   object:[UIApplication sharedApplication]];
}

- (void)viewWillDisappear:(BOOL)animated {
  [super viewWillDisappear:animated];
  [[NSNotificationCenter defaultCenter]
   removeObserver:self
   name:UIApplicationDidBecomeActiveNotification
   object:[UIApplication sharedApplication]];
}

- (void)applicationDidBecomeActiveNotification:(NSNotification *)notification {
  // Do something here
}

@end

这篇关于UIViewController中的applicationDidBecomeActive？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！