iOS Network Activity Indicator
To show and hide Network Activity Indicator

- (void)showHideNetworkIndicator {
      if ([[UIApplication sharedApplication]isNetworkActivityIndicatorVisible]) { //If Network indicator is visible
            [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:false];
      } else { //If Network indicator is invisible
            [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:true];
      }
}
Swift 5.0: - Deprecated

Reference:
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