iphone - 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。我在导航栏下方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。

score 87 · Accepted Answer

我在我想要导航栏中活动指示器的视图中添加以下代码。

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

score 27 · Accepted Answer

SWIFT代码：

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

score 13 · Accepted Answer

您在这里创建了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，只需调用以下代码：

[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:YES];

score 13 · Accepted Answer

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()

score 5 · Accepted Answer

迅速

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

使用这些方法来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)
}

score 4 · Accepted Answer

在故事板上：BarButtonItem在导航栏上创建。添加 View 成为你的儿子和你BarButtonItem的ActivityIndicator儿子View。

score 3 · Accepted Answer

喜欢 WhatsApp：

//宣布

let activityIndicator = UIActivityIndicatorView(activityIndicatorStyle: .gray)

//ViewDidLoad

self.activityIndicator.hidesWhenStopped = true

func showIndicator() {
    self.navigationItem.titleView = self.activityIndicator
    self.activityIndicator.isHidden = false
}

func hideIndicator() {
    self.navigationItem.titleView = nil
}

score 2 · Accepted Answer

谢谢！我的指标现在正在工作。

我正在为其他菜鸟分享一个代码示例，以便将其放在上下文中。

- (void)viewDidLoad

// custom button images
UIImage *customImage = [UIImage imageNamed:@"menu24"];
UIImage *customImage2 = [UIImage imageNamed:@"search24"];
UIImage *customImage3 = [UIImage imageNamed:@"back24"];

// These are linked in my story board to Navigation Item
[self customiseBarBtnItem:[self menu_button] 
    customImage:customImage selector:@selector(menuPressed:)];
[self customiseBarBtnItem:[self search_button] 
    customImage:customImage2 selector:@selector(searchPressed:)];
[self customiseBarBtnItem:[self backButton] 
    customImage:customImage3 selector:@selector(backPressed:)];

//initialize the activity indicator - as @antf comment suggests for ios7   
UIActivityIndicatorView *actInd=[[UIActivityIndicatorView alloc]                                      
     initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];

//store it as a property on the view controller
self.activityIndicator = actInd;

// this sets up activity indicator    
UIBarButtonItem *progress_indicator = [[UIBarButtonItem alloc] 
     initWithCustomView:[self activityIndicator]];

// link custom buttons AND activity indicator in desired order to navigation bar
self.navigationItem.rightBarButtonItems =
    [NSArray arrayWithObjects:
         self.menu_button,
         self.search_button, 
         progress_indicator, 
         nil];

// 为了完整性 - 这就是我以编程方式显示/隐藏我的后退按钮的方式

if ( bShowBack == YES ) 
     self.navItemBar.leftBarButtonItem = self.backButton;
else 
     self.navItemBar.leftBarButtonItem = Nil;

// 我将我的活动指示器与 UIWebView 一起使用，因此按如下方式触发它

  - (void)webViewDidStartLoad:(UIWebView *)webView
  {    
    [[self activityIndicator] startAnimating];
  }

  - (void)didFailLoadWithError:(UIWebView *)webView 
          didFailLoadWithError:(NSError *)error
  {    
     [[self activityIndicator] stopAnimating];
  }

  - (void)webViewDidFinishLoad:(UIWebView *) webView
  {
     [[self activityIndicator] stopAnimating];
  }

score 2 · Accepted Answer

在 Swift 中，我做了以下事情：

使能够： UIApplication.sharedApplication().networkActivityIndicatorVisible = true

禁用： UIApplication.sharedApplication().networkActivityIndicatorVisible = false

score 1 · Accepted Answer

我在这里有一个类似的问题： iphone - programatically change navigation bar button to activity indicator

我想将导航栏中的刷新按钮更改为活动指示器，然后再返回。

score 1 · Accepted Answer

1

尝试这个：self.navigationItem.leftBarButtonItem.customView = your_view

于 2010-02-19T07:37:04.500 回答

score 0 · Accepted Answer

我现在尝试使用它，但战士提到的代码并没有完全按原样工作。我不得不改变activityIndicator的初始化：

activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];

通过此更改，它应该可以按预期工作。

iphone - 如何在导航栏中设置活动指示器？

12 回答 12

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