How to do some stuff in viewDidAppear only once?

Question

I want to check the pasteboard and show an alert if it contains specific values when the view appears. I can place the code into viewDidLoad to ensure it\'s onl

Answer 1

This solution will call viewDidAppear only once throughout the life cycle of the app even if you create the multiple object of the view controller this won't be called after one time. Please refer to the rmaddy's answer above

You can either perform selector in viewDidLoad or you can use dispatch_once_t in you viewDidAppear. If you find a better solution then please do share with me. This is how I do the stuff.

- (void)viewDidLoad {
  [super viewDidLoad];
  [self performSelector:@selector(myMethod) withObject:nil afterDelay:2.0];
}

- (void)viewDidAppear:(BOOL)animated {
  [super viewDidAppear:animated];
  static dispatch_once_t once;
  dispatch_once(&once, ^{
    //your stuff
    [self myMethod];
  });
}