如何在iPhone屏幕中间显示活动指示器？

Answers:

149 
UIActivityIndicatorView *activityView = [[UIActivityIndicatorView alloc]     
        initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];

    activityView.center=self.view.center;
    [activityView startAnimating];
    [self.view addSubview:activityView];
— 阿伦
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13
我还要添加 activityView.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleBottomMargin; 适当的景观定向外观和旋转效果
— adurbum 2014年
@adsurbum谢谢！这是使其集中在从SE到8 Plus的所有尺寸的iPhone屏幕上的关键！在Swift中，它是：activityView.autoresizingMask = [.flexibleLeftMargin，.flexibleTopMargin，.flexibleRightMargin，.flexibleBottomMargin，.flexibleWidth，.flexibleHeight]
— balazs630
43

如果您使用的是Swift，这就是您的做法

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

self.view.addSubview(activityView)
— 罗杰里奥·查韦斯
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15

代码更新为Swift 3

在此处输入图片说明

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

  • 您可以通过将活动指示器作为子视图添加到根目录（view而不是）来将活动指示器居中显示在屏幕中间myBlueSubview。

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

  • 您也可以UIActivityIndicatorView在“界面生成器”中创建。只需将活动指示器视图拖动到情节提要上并设置属性即可。确保选中“停止时隐藏”。使用插座致电startAnimating()和stopAnimating()。请参阅本教程。

在此处输入图片说明

  • 请记住，LargeWhite样式的默认颜色是白色。因此，如果您有白色背景，则看不到它，只需将颜色更改为黑色或您想要的任何其他颜色即可。

    activityIndicator.color = UIColor.black

  • 一个常见的用例是在后台任务运行时。这是一个例子：

    // 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()
    }
}
— 苏拉奇
source
13

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];

如果支持旋转，请设置自动大小调整蒙版。干杯！！！

— D33pN16h7
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4

试试这个

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];
— 阿南德
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4

Swift 4，Autolayout版本

func showActivityIndicator(on parentView: UIView) {
    let activityIndicator = UIActivityIndicatorView(activityIndicatorStyle: .gray)
    activityIndicator.startAnimating()
    activityIndicator.translatesAutoresizingMaskIntoConstraints = false

    parentView.addSubview(activityIndicator)

    NSLayoutConstraint.activate([
        activityIndicator.centerXAnchor.constraint(equalTo: parentView.centerXAnchor),
        activityIndicator.centerYAnchor.constraint(equalTo: parentView.centerYAnchor),
    ])
}
— 奥罕·休西诺夫（Orkhan Huseynov）
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1
欢迎使用S / O，您的答案永远不会是100％的代码。始终添加一些解释。
— 塔斯林·奥塞尼
不确定这是否是黑白规则。如果问题的范围足够简单并且代码不言自明，那么我认为只有代码的答案就可以了。@Orkhan的答案是正确的。
— 安德烈Herculano
2

您可以这样设置位置

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

相应地更改框架大小.....

— 水市
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2

如果要使用“自动布局”使微调器居中，请执行以下操作：

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]];
— 沙欣·吉西（Shaheen Ghiassy）
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2

斯威夫特3，xcode 8.1

您可以使用小扩展名将UIActivityIndi​​catorView放置在UIView和继承的UIView类的中心：

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

在此示例中，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)
    }
}
— 瓦西里·博德纳丘克（Vasily Bodnarchuk）
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1

对于Swift 3，您可以使用以下命令：

 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
}
— 艾哈迈德·洛菲（Ahmed Lotfy）
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0

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];
— 的iOS
source
0

如果您想尝试通过使用界面来做到这一点，则可以观看我的视频。这样，您无需编写任何代码即可在iPhone屏幕中间显示活动指示器。

— 南范
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0 
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)

    }
}
— 通才S.
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谢谢通才！您可以添加一些其他文字来解释您的代码吗？
— 布兰登·明尼克
-1

我找到了一种以最少的代码显示活动指标的方法：

首先导入您的UI Kit

import UIKit;

然后，您必须启动活动指示器

let activityIndicator:UIActivityIndicatorView = UIActivityIndicatorView();

然后只需将以下函数复制粘贴即可，这些函数可以自我说明，并在需要时调用它们：

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();

}
— 夏洛尔·洛纳尔
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