iOS view life circle code example

iOS view life circle code snippet

@implementation

 - (void)setup {
  // Non-UI initialization goes here. It will only ever be called once.
}

- (id)initWithNibName:(NSString *)nibName bundle:(NSString *)bundle {
  if ((self = [super initWithNibName:nibName bundle:bundle])) {
    [self setup];
  }
}

- (void)awakeFromNib {
  [self setup];
}

- (void)viewDidLoad {
  // Any UI-related configuration goes here. It may be called multiple times, 
  // but each time it is called, `self.view` will be freshly loaded from the nib
  // file.
}

- (void)viewDidUnload {
  [super viewDidUnload];
  // Set all IBOutlets to `nil` here.
  // Drop any lazy-load data that you didn't drop in viewWillDisappear:
}

- (void)viewWillAppear:(BOOL)animated {
  [super viewWillAppear:animated];
  // Most data loading should go here to make sure the view matches the model
  // every time it's put on the screen. This is also a good place to observe
  // notifications and KVO, and to setup timers.
}

- (void)viewWillDisappear:(BOOL)animated {
  [super viewWillDisappear:animated];
  // Unregister from notifications and KVO here (balancing viewWillAppear:).
  // Stop timers.
  // This is a good place to tidy things up, free memory, save things to
  // the model, etc.
}

- (void)dealloc {
  // standard release stuff if non-ARC
  [[NSNotificationCenter defaultCenter] removeObvserver:self]; // If you observed anything
  // Stop timers.
  // Don't unregister KVO here. Observe and remove KVO in viewWill(Dis)appear.
}

@end