加载“叠加层”在iOS中运行长任务时 [英] Loading an "overlay" when running long tasks in iOS

问题描述

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

What is example for loading overlay in Swift IOS application when do a long tasks. Example for loading data from remote server. I googled but not found any answer.

更新：

感谢@Sebastian Dressler很简单。我更新了我的代码，它运行很酷

Thanks for @Sebastian Dressler this is simple way. I updated my code and it run cool

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()
    }
}

让我们使用：

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

推荐答案

上面的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叠加。您可以按如下方式实现：

The above answers add a loading view but it doesn't block click events on the screen also it does not provides overlay for rest of screen.You can achieve it as follows:

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)

您可以按如下方式隐藏它：

and you can hide it as follows:

dismiss(animated: false, completion: nil)

它将显示如下：

It will be shown as follows:

这篇关于加载“叠加层”在iOS中运行长任务时的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！