如何在iPhone屏幕中间显示活动指标？

当我们绘制图像时，我们要显示活动指标。 任何人都可以帮忙吗？

Answer 1

UIActivityIndicatorView *activityView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge]; activityView.center=self.view.center; [activityView startAnimating]; [self.view addSubview:activityView]; 

Answer 2

如果你正在使用Swift，那么你就是这么做的

 let activityView = UIActivityIndicatorView(activityIndicatorStyle: .whiteLarge) activityView.center = self.view.center activityView.startAnimating() self.view.addSubview(activityView) 

Answer 3

这是正确的方法：

 UIActivityIndicatorView *activityIndicator = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray]; activityIndicator.center = CGPointMake(self.view.frame.size.width / 2.0, self.view.frame.size.height / 2.0); [self.view addSubview: activityIndicator]; [activityIndicator startAnimating]; [activityIndicator release]; 

如果您支持旋转，请设置您的自动识别掩码。 干杯！！！

Answer 4

代码更新为Swift 3

SWIFT代码

 import UIKit class ViewController: UIViewController { let activityIndicator = UIActivityIndicatorView(activityIndicatorStyle: UIActivityIndicatorViewStyle.whiteLarge) @IBOutlet weak var myBlueSubview: UIView! @IBAction func showButtonTapped(sender: UIButton) { activityIndicator.startAnimating() } @IBAction func hideButtonTapped(sender: UIButton) { activityIndicator.stopAnimating() } override func viewDidLoad() { super.viewDidLoad() // set up activity indicator activityIndicator.center = CGPoint(x: myBlueSubview.bounds.size.width/2, y: myBlueSubview.bounds.size.height/2) activityIndicator.color = UIColor.yellow myBlueSubview.addSubview(activityIndicator) } } 

笔记

• 您可以将活动指标集中在屏幕中间，将其作为子视图添加到根view而不是myBlueSubview 。

   activityIndicator.center = CGPoint(x: self.view.bounds.size.width/2, y: self.view.bounds.size.height/2) self.view.addSubview(activityIndicator) 

• 您还可以在Interface Builder中创buildUIActivityIndicatorView 。 只需将一个活动指标视图拖动到故事板上并设置属性。 一定要检查时停止隐藏 。 使用sockets来调用startAnimating()和stopAnimating() 。 看到这个教程 。

• 请记住， LargeWhite样式的默认颜色是白色。 所以，如果你有一个白色的背景，你不能看到它，只要将颜色改为黑色或其他任何你想要的颜色。

   activityIndicator.color = UIColor.black 

• 一个常见的用例是在后台任务运行的时候。 这里是一个例子：

   // start animating before the background task starts activityIndicator.startAnimating() // background task DispatchQueue.global(qos: .userInitiated).async { doSomethingThatTakesALongTime() // return to the main thread DispatchQueue.main.async { // stop animating now that background task is finished self.activityIndicator.stopAnimating() } } 

Answer 5

如果你想添加一个文本随着活动指标，请看http://nullpointr.wordpress.com/2012/02/27/ios-dev-custom-activityindicatorview/

Answer 6

试试这个方法

 UIActivityIndicatorView *activityIndicator = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray]; activityIndicator.frame = CGRectMake(10.0, 0.0, 40.0, 40.0); activityIndicator.center = super_view.center; [super_view addSubview: activityIndicator]; [activityIndicator startAnimating]; 

Answer 7

你可以像这样设置位置

  UIActivityIndicatorView *activityView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite]; activityView.frame = CGRectMake(120, 230, 50, 50); [self.view addSubview:activityView]; 

相应地改变帧的大小…..

Answer 8

如果你想使用自动布局中心微调，做：

 UIActivityIndicatorView *activityView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge]; [activityView startAnimating]; [self.view addSubview:activityView]; [self.view addConstraint:[NSLayoutConstraint constraintWithItem:activityView attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeCenterX multiplier:1.0 constant:0.0]]; [self.view addConstraint:[NSLayoutConstraint constraintWithItem:activityView attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeCenterY multiplier:1.0 constant:0.0]]; 

Answer 9

对于Swift 3，您可以使用以下内容：

  func setupSpinner(){ spinner = UIActivityIndicatorView(frame: CGRect(x: 0, y: 0, width: 40, height:40)) spinner.color = UIColor(Colors.Accent) self.spinner.center = CGPoint(x:UIScreen.main.bounds.size.width / 2, y:UIScreen.main.bounds.size.height / 2) self.view.addSubview(spinner) spinner.hidesWhenStopped = true } 

Answer 10

希望这会起作用：

 // create activity indicator UIActivityIndicatorView *activityIndicator = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 20.0f, 20.0f)]; [activityIndicator setActivityIndicatorViewStyle:UIActivityIndicatorViewStyleWhite]; ... [self.view addSubview:activityIndicator]; // release it [activityIndicator release]; 

Answer 11

如果你想尝试使用界面，你可以查看我的video 。 这样，你不需要写任何代码来显示在iPhone屏幕中间的活动指标。

Answer 12

Swift 3，xcode 8.1

你可以使用小的扩展名将UIActivityIndi​​catorView放在UIView的中心，并inheritanceUIView类：

码

 extension UIActivityIndicatorView { convenience init(activityIndicatorStyle: UIActivityIndicatorViewStyle, color: UIColor, placeInTheCenterOf parentView: UIView) { self.init(activityIndicatorStyle: activityIndicatorStyle) center = parentView.center self.color = color parentView.addSubview(self) } } 

如何使用

 let activityIndicator = UIActivityIndicatorView(activityIndicatorStyle: .whiteLarge, color: .gray, placeInTheCenterOf: view) activityIndicator.startAnimating() 

完整的例子

在这个例子中，UIActivityIndi​​catorView放置在ViewControllers视图的中心：

 import UIKit class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view, typically from a nib. let activityIndicator = UIActivityIndicatorView(activityIndicatorStyle: .whiteLarge, color: .gray, placeInTheCenterOf: view) activityIndicator.startAnimating() } } extension UIActivityIndicatorView { convenience init(activityIndicatorStyle: UIActivityIndicatorViewStyle, color: UIColor, placeInTheCenterOf parentView: UIView) { self.init(activityIndicatorStyle: activityIndicatorStyle) center = parentView.center self.color = color parentView.addSubview(self) } } 

Answer 13

 import UIKit class ViewController: UIViewController { @IBOutlet weak var textLbl: UILabel! var containerView = UIView() var loadingView = UIView() var activityIndicator = UIActivityIndicatorView() override func viewDidLoad() { super.viewDidLoad() let _ = Timer.scheduledTimer(withTimeInterval: 10, repeats: false) { (_) in self.textLbl.text = "Stop ActivitiIndicator" self.activityIndicator.stopAnimating() self.containerView.removeFromSuperview() } } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() } @IBAction func palyClicked(sender: AnyObject){ containerView.frame = self.view.frame containerView.backgroundColor = UIColor(red: 0/255, green: 0/255, blue: 0/255, alpha: 0.3) self.view.addSubview(containerView) loadingView.frame = CGRect(x: 0, y: 0, width: 80, height: 80) loadingView.center = self.view.center loadingView.backgroundColor = UIColor(red: 0/255, green: 0/255, blue: 0/255, alpha: 0.5) loadingView.clipsToBounds = true loadingView.layer.cornerRadius = 10 containerView.addSubview(loadingView) activityIndicator.frame = CGRect(x: 0, y: 0, width: 40, height: 40) activityIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.whiteLarge activityIndicator.center = CGPoint(x:loadingView.frame.size.width / 2, y:loadingView.frame.size.height / 2); activityIndicator.startAnimating() loadingView.addSubview(activityIndicator) } } 

Answer 14

我find了一种方法来显示最小代码的活动指标：

首先导入你的UI套件

 import UIKit; 

那么你必须发起活动指标

 let activityIndicator:UIActivityIndicatorView = UIActivityIndicatorView(); 

然后只需复制粘贴下面这个自我解释的函数，然后调用它们，无论你需要他们：

 func startLoading(){ activityIndicator.center = self.view.center; activityIndicator.hidesWhenStopped = true; activityIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.gray; view.addSubview(activityIndicator); activityIndicator.startAnimating(); UIApplication.shared.beginIgnoringInteractionEvents(); } func stopLoading(){ activityIndicator.stopAnimating(); UIApplication.shared.endIgnoringInteractionEvents(); }