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//Cria um Activity Indicator @property (weak, nonatomic) IBOutlet UIActivityIndicatorView *spinner; - (IBAction) someMethod { [theActivityIndicator startAnimating]; [self performSelector: @selector(doSomethingSlow) withObject: nil afterDelay: 0]; return; } - (void) doSomethingSlow { //perform time-consuming tasks [theActivityIndicator stopAnimating]; } |