UIBarbutton 'Save' UIActivity Indicator 在导航栏上停止后不再出现

Question

我的导航栏上有一个 Save（系统项）作为 BarButtonItem 当用户单击此 Save 按钮时，我在导航栏上显示 UIActivityIndicatorView 并且我想在特定条件下再次出现此 Barbutton(Save)。首先，我认为问题是我在 customView 上添加了一个指示器，因此我不需要隐藏 barbutton.It 在我启动指示器后自动隐藏自身。但现在不知道如何再次显示保存按钮。或者如何从 customView

中删除指标

我就是这样做的

 @IBOutlet weak var saveButtonOutlet: UIBarButtonItem!
 var activityIndicatorView:UIActivityIndicatorView!
func showActivityIndicator() {

         activityIndicatorView = UIActivityIndicatorView(activityIndicatorStyle: UIActivityIndicatorViewStyle.White)
        activityIndicatorView.frame = CGRectMake(0, 0, 14, 14)
        activityIndicatorView.color = UIColor().blueColorIOS()
        activityIndicatorView.startAnimating()

        let barButtonItem = UIBarButtonItem(customView:  activityIndicatorView)
        self.navigationItem.rightBarButtonItem = barButtonItem
      }


   @IBAction func saveButtonClicked(sender: UIBarButtonItem) {

        showActivityIndicator()

      ServerRequest.postToServer(url, params: params){
            result, error in
            if let result = result {
                let code =  result["code"] as? Int
                print(result)
                if (code==200){

                    dispatch_after(DISPATCH_TIME_NOW, dispatch_get_main_queue(), { ()->() in

                        self.activityIndicatorView.hidden = true
                        self.activityIndicatorView.hidesWhenStopped = true
                        //here want to show again "saveButtonOutlet" 

                                       })


                }

            }
        }



    }


   }

Answer 1

我认为您需要做的就是将 self.navigationItem.rightBarButtonItem 重置为 saveButtonOutlet。现在为我工作。

Answer 2

因此，一种方法是再次创建“保存”按钮，并再次设置 rightBarButtonItem：

...
self.activityIndicatorView.hidden = true
self.activityIndicatorView.hidesWhenStopped = true
let barButtonItem = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.Save, target: self, action: "saveButtonClicked:")
self.navigationItem.rightBarButtonItem = barButtonItem

而且我还将 self.activityIndicatorView.hidden = true 替换为 self.activityIndicatorView.stopAnimating() 以正确使用 hidesWhenStopped 属性.

UIBarbutton 'Save' UIActivity Indicator 在导航栏上停止后不再出现

UIBarbutton 'Save' not appearing again after UIActivity Indicator stops on navigation Bar

uibarbuttonitem

ios

swift