在 iOS 中运行长任务时加载 "overlay"

Question

在Swift IOS 应用程序中执行长任务时加载叠加层的示例是什么。从远程服务器加载数据的示例。我用谷歌搜索但没有找到任何答案。

已更新：

感谢@Sebastian Dressler，这是一种简单的方法。我更新了我的代码，它运行很酷

public class LoadingOverlay{

var overlayView = UIView()
var activityIndicator = UIActivityIndicatorView()

class var shared: LoadingOverlay {
    struct Static {
        static let instance: LoadingOverlay = LoadingOverlay()
    }
    return Static.instance
}

    public func showOverlay(view: UIView) {

        overlayView.frame = CGRectMake(0, 0, 80, 80)
        overlayView.center = view.center
        overlayView.backgroundColor = UIColor(hex: 0x444444, alpha: 0.7)
        overlayView.clipsToBounds = true
        overlayView.layer.cornerRadius = 10

        activityIndicator.frame = CGRectMake(0, 0, 40, 40)
        activityIndicator.activityIndicatorViewStyle = .WhiteLarge
        activityIndicator.center = CGPointMake(overlayView.bounds.width / 2, overlayView.bounds.height / 2)

        overlayView.addSubview(activityIndicator)
        view.addSubview(overlayView)

        activityIndicator.startAnimating()
    }

    public func hideOverlayView() {
        activityIndicator.stopAnimating()
        overlayView.removeFromSuperview()
    }
}

让使用：

LoadingOverlay.shared.showOverlay(self.view)
//To to long tasks
LoadingOverlay.shared.hideOverlayView()

Answer 1

只需为自己创建一个叠加视图，将其添加到父视图并在任务完成后将其删除，例如添加它：

var overlay : UIView? // This should be a class variable

[ ... ]

overlay = UIView(frame: view.frame)
overlay!.backgroundColor = UIColor.blackColor()
overlay!.alpha = 0.8

view.addSubview(overlay!)

删除：

overlay?.removeFromSuperview()

Answer 2

为了补充给定的答案，如果您有时尝试运行代码，您可能运行会遇到问题。就个人而言，有一次 showOverlay 没有被正确调用（因为我试图进入场景，然后在 viewDidLoad 期间立即调用此函数）。

如果您运行遇到与我类似的问题，我建议对代码进行一次修复并改变一种方法。

FIX：将两个代码块作为 dispatch_async 调用的闭包，如下所示：

dispatch_async(dispatch_get_main_queue(),
 { //code });

方法：调用您的代码时，在主队列上执行dispatch_after 调用以将调用延迟几毫秒。

推理？您只是要求 UI 在 viewDidLoad 期间做太多事情。

如果此解决方案的附录对您有所帮助，我会很高兴。

-乔尔·朗

P.S。解决方案适用于 XCode v6.3.2

Answer 3

对于像我这样迟到的人，我对@Sonrobby 代码做了一些修改。据我了解，@Sonrobby 在每次 showOverlay 调用时将 activity 添加到叠加层。而一些配置可以传给init函数，只让放置在showOverlay方法上。

我还将叠加层的背景更改为黑色，因为我的应用程序大部分是白色的。

这是代码：

public class LoadingOverlay{

    var overlayView : UIView!
    var activityIndicator : UIActivityIndicatorView!

    class var shared: LoadingOverlay {
        struct Static {
            static let instance: LoadingOverlay = LoadingOverlay()
        }
        return Static.instance
    }

    init(){
        self.overlayView = UIView()
        self.activityIndicator = UIActivityIndicatorView()

        overlayView.frame = CGRectMake(0, 0, 80, 80)
        overlayView.backgroundColor = UIColor(white: 0, alpha: 0.7)
        overlayView.clipsToBounds = true
        overlayView.layer.cornerRadius = 10
        overlayView.layer.zPosition = 1

        activityIndicator.frame = CGRectMake(0, 0, 40, 40)
        activityIndicator.center = CGPointMake(overlayView.bounds.width / 2, overlayView.bounds.height / 2)
        activityIndicator.activityIndicatorViewStyle = .WhiteLarge
        overlayView.addSubview(activityIndicator)
    }

    public func showOverlay(view: UIView) {
        overlayView.center = view.center
        view.addSubview(overlayView)
        activityIndicator.startAnimating()
    }

    public func hideOverlayView() {
        activityIndicator.stopAnimating()
        overlayView.removeFromSuperview()
    }
}

Answer 4

以上答案添加了加载视图，但它不会阻止屏幕上的点击事件，也不会为屏幕的其余部分提供覆盖。您可以通过以下方式实现：

let alert = UIAlertController(title: nil, message: "Please wait...", preferredStyle: .Alert)

alert.view.tintColor = UIColor.blackColor()
let loadingIndicator: UIActivityIndicatorView = UIActivityIndicatorView(frame: CGRectMake(10, 5, 50, 50)) as UIActivityIndicatorView
loadingIndicator.hidesWhenStopped = true
loadingIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.Gray
loadingIndicator.startAnimating();

alert.view.addSubview(loadingIndicator)
presentViewController(alert, animated: true, completion: nil)

Swift 3.0

let alert = UIAlertController(title: nil, message: "Please wait...", preferredStyle: .alert)

let loadingIndicator = UIActivityIndicatorView(frame: CGRect(x: 10, y: 5, width: 50, height: 50))
loadingIndicator.hidesWhenStopped = true
loadingIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.gray
loadingIndicator.startAnimating();

alert.view.addSubview(loadingIndicator)
present(alert, animated: true, completion: nil)

Swift 4.0 及更高版本

let alert = UIAlertController(title: nil, message: "Please wait...", preferredStyle: .alert)

let loadingIndicator = UIActivityIndicatorView(frame: CGRect(x: 10, y: 5, width: 50, height: 50))
loadingIndicator.hidesWhenStopped = true
loadingIndicator.style = UIActivityIndicatorView.Style.gray
loadingIndicator.startAnimating();

alert.view.addSubview(loadingIndicator)
present(alert, animated: true, completion: nil)

你可以隐藏它如下：

dismiss(animated: false, completion: nil)

会显示如下：

Answer 5

Swift 3.

我在他下面的回答中使用了@Lucho 的代码，我将覆盖背景颜色更改为清除并添加了微调器颜色。

public class LoadingOverlay {

    var overlayView : UIView!
    var activityIndicator : UIActivityIndicatorView!

    class var shared: LoadingOverlay {
        struct Static {
            static let instance: LoadingOverlay = LoadingOverlay()
        }
        return Static.instance
    }

    init(){
        self.overlayView = UIView()
        self.activityIndicator = UIActivityIndicatorView()

        overlayView.frame = CGRect(0, 0, 80, 80)
        overlayView.backgroundColor = .clear
        overlayView.clipsToBounds = true
        overlayView.layer.cornerRadius = 10
        overlayView.layer.zPosition = 1

        activityIndicator.frame = CGRect(0, 0, 40, 40)
        activityIndicator.center = CGPoint(overlayView.bounds.width / 2, overlayView.bounds.height / 2)
        activityIndicator.activityIndicatorViewStyle = .whiteLarge
        activityIndicator.color = .gray
        overlayView.addSubview(activityIndicator)
    }

    public func showOverlay(view: UIView) {
        overlayView.center = view.center
        view.addSubview(overlayView)
        activityIndicator.startAnimating()
    }

    public func hideOverlayView() {
        activityIndicator.stopAnimating()
        overlayView.removeFromSuperview()
    }
}

Answer 6

我已经创建了一个协议，用于将您自己的视图控制器呈现为叠加层。用法很简单：

class ViewController: UIViewController, OverlayHost {
    @IBAction func showOverlayButtonPressed() {
        showOverlay(type: YourOverlayViewController.self, 
            fromStoryboardWithName: "Main")
    }
}

结果：

源代码：https://github.com/agordeev/OverlayViewController

相关文章：https://andreygordeev.com/2017/04/18/overlay-view-controller-protocols-swift/

Answer 7

更新了@sonrobby 的回答，通过调整蒙版大小添加了背景视图和方向处理...这可用于简单的东西

public class LoadingOverlay{

    var overlayView = UIView()
    var activityIndicator = UIActivityIndicatorView()
    var bgView = UIView()

    class var shared: LoadingOverlay {
        struct Static {
            static let instance: LoadingOverlay = LoadingOverlay()
        }
        return Static.instance
    }

    public func showOverlay(view: UIView) {

        bgView.frame = view.frame
        bgView.backgroundColor = UIColor.gray
        bgView.addSubview(overlayView)
        bgView.autoresizingMask = [.flexibleLeftMargin,.flexibleTopMargin,.flexibleRightMargin,.flexibleBottomMargin,.flexibleHeight, .flexibleWidth]
        overlayView.frame = CGRect(x: 0, y: 0, width: 80, height: 80)
        overlayView.center = view.center
        overlayView.autoresizingMask = [.flexibleLeftMargin,.flexibleTopMargin,.flexibleRightMargin,.flexibleBottomMargin]
        overlayView.backgroundColor = UIColor.black
        overlayView.clipsToBounds = true
        overlayView.layer.cornerRadius = 10

        activityIndicator.frame = CGRect(x: 0, y: 0, width: 40, height: 40)
        activityIndicator.activityIndicatorViewStyle = .whiteLarge
        activityIndicator.center = CGPoint(x: overlayView.bounds.width / 2, y: overlayView.bounds.height / 2)

        overlayView.addSubview(activityIndicator)
        view.addSubview(bgView)
        self.activityIndicator.startAnimating()

    }

    public func hideOverlayView() {
        activityIndicator.stopAnimating()
        bgView.removeFromSuperview()
    }
}

如果您将它添加到 keywindow，它也可以遍历您的导航栏和标签栏...像这样

LoadingOverlay.shared.showOverlay(view: UIApplication.shared.keyWindow!)

Answer 8

模糊背景 + Activity 指标，Swift 5 个例子

extension UIView {
    func showBlurLoader() {
        let blurLoader = BlurLoader(frame: frame)
        self.addSubview(blurLoader)
    }

    func removeBluerLoader() {
        if let blurLoader = subviews.first(where: { [=10=] is BlurLoader }) {
            blurLoader.removeFromSuperview()
        }
    }
}


class BlurLoader: UIView {

    var blurEffectView: UIVisualEffectView?

    override init(frame: CGRect) {
        let blurEffect = UIBlurEffect(style: .dark)
        let blurEffectView = UIVisualEffectView(effect: blurEffect)
        blurEffectView.frame = frame
        blurEffectView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        self.blurEffectView = blurEffectView
        super.init(frame: frame)
        addSubview(blurEffectView)
        addLoader()
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    private func addLoader() {
        guard let blurEffectView = blurEffectView else { return }
        let activityIndicator = UIActivityIndicatorView(style: .whiteLarge)
        activityIndicator.frame = CGRect(x: 0, y: 0, width: 50, height: 50)
        blurEffectView.contentView.addSubview(activityIndicator)
        activityIndicator.center = blurEffectView.contentView.center
        activityIndicator.startAnimating()
    }
}

Answer 9

使用 ATKit。

参考： https://aurvan.github.io/atkit-ios-release/index.html

ATProgressOverlay Class https://aurvan.github.io/atkit-ios-release/helpbook/Classes/ATProgressOverlay.html

代码：

import ATKit

ATProgressOverlay.sharedInstance.show() // Does not show network activity indicator on status bar.

ATProgressOverlay.sharedInstance.show(isNetworkActivity: true) // Shows network activity indicator on status bar.

截图：

Answer 10

Swift 5

class func showUniversalLoadingView(_ show: Bool, loadingText : String = "") {
    let existingView = UIApplication.shared.windows[0].viewWithTag(1200)
    if show {
        if existingView != nil {
            return
        }
        let loadingView = self.makeLoadingView(withFrame: UIScreen.main.bounds, loadingText: loadingText)
        loadingView?.tag = 1200
        UIApplication.shared.windows[0].addSubview(loadingView!)
    } else {
        existingView?.removeFromSuperview()
    }

}



 class func makeLoadingView(withFrame frame: CGRect, loadingText text: String?) -> UIView? {
    let loadingView = UIView(frame: frame)
    loadingView.backgroundColor = UIColor(red: 0, green: 0, blue: 0, alpha: 0.5)
    let activityIndicator = UIActivityIndicatorView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
    //activityIndicator.backgroundColor = UIColor(red:0.16, green:0.17, blue:0.21, alpha:1)
    activityIndicator.layer.cornerRadius = 6
    activityIndicator.center = loadingView.center
    activityIndicator.hidesWhenStopped = true
    activityIndicator.style = .white
    activityIndicator.startAnimating()
    activityIndicator.tag = 100 // 100 for example

    loadingView.addSubview(activityIndicator)
    if !text!.isEmpty {
        let lbl = UILabel(frame: CGRect(x: 0, y: 0, width: 200, height: 30))
        let cpoint = CGPoint(x: activityIndicator.frame.origin.x + activityIndicator.frame.size.width / 2, y: activityIndicator.frame.origin.y + 80)
        lbl.center = cpoint
        lbl.textColor = UIColor.white
        lbl.textAlignment = .center
        lbl.text = text
        lbl.tag = 1234
        loadingView.addSubview(lbl)
    }
    return loadingView
}

使用

showUniversalLoadingView(true, loadingText: "Downloading Data.......")

showUniversalLoadingView(真)

删除加载程序

showUniversalLoadingView(false)

Answer 11

@Ajinkya Patil 的回答作为参考。 Swift 4.0 及更高版本

这是一个扩展解决方案，可以在所有 viewController 上使用而不会发生冲突。

创建一个加载对话框+ViewContoller.swift

import UIKit

struct ProgressDialog {
    static var alert = UIAlertController()
    static var progressView = UIProgressView()
    static var progressPoint : Float = 0{
        didSet{
            if(progressPoint == 1){
                ProgressDialog.alert.dismiss(animated: true, completion: nil)
            }
        }
    }
}
extension UIViewController{
   func LoadingStart(){
        ProgressDialog.alert = UIAlertController(title: nil, message: "Please wait...", preferredStyle: .alert)
    
    let loadingIndicator = UIActivityIndicatorView(frame: CGRect(x: 10, y: 5, width: 50, height: 50))
    loadingIndicator.hidesWhenStopped = true
    loadingIndicator.style = UIActivityIndicatorView.Style.gray
    loadingIndicator.startAnimating();

    ProgressDialog.alert.view.addSubview(loadingIndicator)
    present(ProgressDialog.alert, animated: true, completion: nil)
  }

  func LoadingStop(){
    ProgressDialog.alert.dismiss(animated: true, completion: nil)
  }
}

在任何地方调用 ViewController 中的函数。像这样：

self.LoadingStart()

这是停止加载对话框的方法。

self.LoadingStop()

Answer 12

Xamarin.iOS版本：

var alert = UIAlertController.Create(string.Empty, "Please wait...", UIAlertControllerStyle.Alert);
var alertIndicatorView = new UIActivityIndicatorView();
alertIndicatorView.Frame = new CGRect(x: 10, y: 5, width: 50, height: 50);
alertIndicatorView.ActivityIndicatorViewStyle = UIActivityIndicatorViewStyle.Gray;
alertIndicatorView.HidesWhenStopped = true;
alertIndicatorView.StartAnimating();
alert.Add(alertIndicatorView);
controller.PresentViewController(alert, true, null);

Answer 13

如果有人正在寻找用于加载视图的 Lottie 实现，这是我使用@Shourob Datta 解决方案制作的有效解决方案：

import Foundation
import UIKit
import Lottie

public class LogoLoadingAnimation{
    
    class func showUniversalLoadingView(_ show: Bool, loadingText : String = "") {
        let existingView = UIApplication.shared.windows[0].viewWithTag(1200)
        if show {
            if existingView != nil {
                return
            }
            let loadingView = self.makeLoadingView(withFrame: UIScreen.main.bounds, loadingText: loadingText)
            loadingView?.tag = 1200
            UIApplication.shared.windows[0].addSubview(loadingView!)
        } else {
            existingView?.removeFromSuperview()
        }
        
    }
    
    
    
    class func makeLoadingView(withFrame frame: CGRect, loadingText text: String?) -> UIView? {
        let gradienView = GradientBackgroundView(frame: frame)
        gradienView.startColor = UIColor(red: 255, green: 255, blue: 255, alpha: 1)
        gradienView.endColor = UIColor(red: 238, green: 238, blue: 238, alpha: 1)
        gradienView.startColor = UIColor(named: "dark") ?? .blue
        gradienView.startColor = UIColor(named: "purpuleGrey") ?? .gray
        let loadingAnimationView = AnimationView()
        gradienView.addSubview(loadingAnimationView)
        loadingAnimationView.translatesAutoresizingMaskIntoConstraints = false
        loadingAnimationView.centerXAnchor.constraint(equalTo: gradienView.centerXAnchor).isActive = true
        loadingAnimationView.centerYAnchor.constraint(equalTo: gradienView.centerYAnchor).isActive = true
        loadingAnimationView.animation = UITraitCollection.current.userInterfaceStyle == .dark ? Animation.named("logoLoadingWhite") : Animation.named("logoLoadingBlue")
        loadingAnimationView.backgroundBehavior = .pauseAndRestore
        loadingAnimationView.contentMode = .scaleAspectFit
        loadingAnimationView.loopMode = .loop
        loadingAnimationView.play()
        return gradienView
    }
    
}

在 iOS 中运行长任务时加载 "overlay"

Loading an "overlay" when running long tasks in iOS

ios

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uiview

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在 iOS 中 运行 长任务时加载 "overlay"

Loading an "overlay" when running long tasks in iOS

ios

swift

uiview

overlay

在 iOS 中运行长任务时加载 "overlay"