Replace UIBarButtonItem with UIActivityIndicatorView

Question

I want to replace my UIBarButtonItem (used for refresh) with a UIActivityIndicatorView and, when the refresh is finished, I want to turn back to the refresh button and remove the UIActivityIndicatorView.

Answer 1

Just create two different UIBarButtonItems

One for the activity indicator and another for a normal UIBarButtonItem.

UIActivityIndicatorView * activityView = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(0, 0, 25, 25)]; [activityView sizeToFit]; [activityView setAutoresizingMask:(UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottomMargin)]; UIBarButtonItem *loadingView = [[UIBarButtonItem alloc] initWithCustomView:activityView]; [self.navigationItem setRightBarButtonItem:loadingView]; [loadingView release]; [activityView release];  UIBarButtonItem * normalButton = [[UIBarButtonItem alloc] initWithTitle...]; [self.navigationItem setRightBarButtonItem:normalButton]; [normalButton release]; 

When you want to switch them, just reassign the rightBarButtonItem to whichever.

Answer 2

Updated for Swift 5.2, Xcode 11.4

class ViewController: UIViewController {      var activityIndicator = UIActivityIndicatorView()     var refreshBarButton = UIBarButtonItem()     var activityBarButton = UIBarButtonItem()      override func viewDidLoad() {         super.viewDidLoad()          activityIndicator.sizeToFit()         activityIndicator.color = self.view.tintColor          activityBarButton = UIBarButtonItem(customView: activityIndicator)         refreshBarButton = UIBarButtonItem(barButtonSystemItem: .refresh, target: self, action: #selector(refreshBarButtonPressed))          showRefreshButton()     }      func performNetworkOperation(completion: @escaping()->()) {         //simulate network operation         DispatchQueue.main.asyncAfter(deadline: .now() + 3, execute: {         completion()         })     }      @objc func refreshBarButtonPressed() {          showActivityIndicator()         activityIndicator.startAnimating()          performNetworkOperation {             self.activityIndicator.stopAnimating()             self.showRefreshButton()         }     }      func showRefreshButton() {         self.navigationItem.setRightBarButton(refreshBarButton, animated: true)     }      func showActivityIndicator() {         self.navigationItem.setRightBarButton(activityBarButton, animated: true)     } }