Set the activity indicator in the navigation bar in iPhone

UIActivityIndicatorView *activityIndicator = 
[[UIActivityIndicatorView alloc]initWithFrame:CGRectMake(0, 0, 20, 20)];
UIBarButtonItem * barButton = [[UIBarButtonItem alloc] 
                              initWithCustomView:activityIndicator];
[self navigationItem].rightBarButtonItem = barButton;
[activityIndicator startAnimating];

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