-(void)Viewdidload
{
UIActivityIndicatorView *activity = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];
[activity setFrame:CGRectMake(0, 0, 20, 20)];
[self.view addSubview:activity];
}
-(void)PressLoginBtn
{
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
[activity startAnimating];
// call another controller
}
- (void)viewWillDisappear:(BOOL)animated
{
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
[activity stopAnimating];
}