Question

could you show me some algorithm or example code to display like that picture with or with out animation

thanks for all advise

Answer 1

Add a semi-transparent view (regular view with black background with opacity = 80) that will cover the entire screen (in IB or in code), add a UIActivityIndicator and a label to the semi-transparent view, set it hidden.

If you use the IB then you should also create IBOutlets for the semi-transparent view (loadingView) and for the activity indicator (loadingAnimationIndicator)…

Use the next methods to show / hide the “loading view”:

- (void)showLoading {
  [loadingAnimationIndicator startAnimating];
  loadingView.hidden = NO;
} 
- (void)hideLoading {
  loadingView.hidden = YES;
  [loadingAnimationIndicator stopAnimating];
}