如何在导航栏中设置活动指示器？

Question

我是iphone开发的新手.我想在导航栏中设置一个活动指示器.我在导航栏下面看到我的活动指示器.我的代码在这里

- (IBAction) gomethod : (id) sender {
    xxMapSubviewcontroller = [[XxMapSubviewcontroller alloc] init];
    [self.navigationController pushViewController:xxMapSubviewcontroller animated:YES];

    activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
    activityIndicator.frame = CGRectMake(0.0, 0.0, 20.0, 20.0);
    [activityIndicator startAnimating];

    [xxMapSubviewcontroller.view addSubview:activityIndicator];
}

如何在导航栏中设置我的活动指示器？请帮帮我.谢谢.

Answer 1

我在视图中添加了以下代码,我想在导航栏中显示活动指示器.

activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
UIBarButtonItem * barButton = [[UIBarButtonItem alloc] initWithCustomView:activityIndicator];
[self navigationItem].rightBarButtonItem = barButton;
[activityIndicator startAnimating];

Answer 2

SWIFT代码:

let activityIndicator = UIActivityIndicatorView(frame: CGRect(x: 0, y: 0, width: 20, height: 20))
let barButton = UIBarButtonItem(customView: activityIndicator)
self.navigationItem.setRightBarButtonItem(barButton, animated: true)
activityIndicator.startAnimating()

Answer 3

您正在此处创建一个新的活动指示器视图,这很好,但您不是指状态栏中的活动指示器.

要在状态栏中显示活动指示器,只需调用:

[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:YES];

Answer 4

这在Swift中对我有用:

let activityIndicator: UIActivityIndicatorView = UIActivityIndicatorView.init(activityIndicatorStyle: .White)
let refreshBarButton: UIBarButtonItem = UIBarButtonItem(customView: activityIndicator)
self.navigationItem.leftBarButtonItem = refreshBarButton
activityIndicator.startAnimating()

Answer 5

在情节提要上：BarButtonItem在导航栏上创建。将 View 添加为您的儿子BarButtonItem和ActivityIndicator您的儿子View。

Answer 6

迅速

1. 连接UIBarButtonItem从storyboard到yourViewController
2. week从其定义中删除，例如：@IBOutlet var btNavigaitonRight: UIBarButtonItem!

3. 使用这些方法启动和停止活动指示器：

   var activityIndicator = UIActivityIndicatorView()
   
   func startBarButtonIndicator() {
       activityIndicator = UIActivityIndicatorView(frame: CGRect(x: 0, y: 0, width: 20, height: 20))
       activityIndicator?.color = .gray
       let barButton = UIBarButtonItem(customView: activityIndicator!)
       self.navigationItem.setRightBarButton(barButton, animated: true)
       activityIndicator?.startAnimating()
   }
   
   func stopBarButtonIndicator() {
       activityIndicator?.stopAnimating()
       navigationItem.setRightBarButton(btNavigaitonRight, animated: true)
   }