ios - UIViewController 中的 applicationDidBecomeActive？

Question

当应用程序激活时调用该applicationDidBecomeActive方法，有没有办法可以为某个 UIViewController 执行此方法？我知道有viewDidAppear视图控制器，但我正在寻找当应用程序再次激活并且在某个 UIViewController 上时调用的方法。我怎样才能做到这一点？

Answer 1

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