iOS8中的"请稍候"对话框

Question

我曾经在我的应用程序中长时间使用"请稍候"对话框.使用UIActivityIndicatorView和添加它是非常简单的事情UIAlertView.

但是iOS8推出了UIAlertController.是否可以添加任何东西以产生类似的效果？还有其他方法可以用iOS8做这样的事情吗？

我搜索了很多网站,但仍然不知道如何使用新的API.

我会很感激任何答案 - 链接到libs,教程等,这可能会有所帮助.

问候,

Mateusz

Answer 1

您可以使用以模态方式呈现的自定义UIViewController,而不是使用UIAlertController.这是我在Swift 2.0中使用的:

class ActivityViewController: UIViewController {

    private let activityView = ActivityView()

    init(message: String) {
        super.init(nibName: nil, bundle: nil)
        modalTransitionStyle = .CrossDissolve
        modalPresentationStyle = .OverFullScreen
        activityView.messageLabel.text = message
        view = activityView
    }

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

private class ActivityView: UIView {

    let activityIndicatorView = UIActivityIndicatorView(activityIndicatorStyle: .WhiteLarge)
    let boundingBoxView = UIView(frame: CGRectZero)
    let messageLabel = UILabel(frame: CGRectZero)

    init() {
        super.init(frame: CGRectZero)

        backgroundColor = UIColor(white: 0.0, alpha: 0.5)

        boundingBoxView.backgroundColor = UIColor(white: 0.0, alpha: 0.5)
        boundingBoxView.layer.cornerRadius = 12.0

        activityIndicatorView.startAnimating()

        messageLabel.font = UIFont.boldSystemFontOfSize(UIFont.labelFontSize())
        messageLabel.textColor = UIColor.whiteColor()
        messageLabel.textAlignment = .Center
        messageLabel.shadowColor = UIColor.blackColor()
        messageLabel.shadowOffset = CGSizeMake(0.0, 1.0)
        messageLabel.numberOfLines = 0

        addSubview(boundingBoxView)
        addSubview(activityIndicatorView)
        addSubview(messageLabel)
    }

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

    override func layoutSubviews() {
        super.layoutSubviews()

        boundingBoxView.frame.size.width = 160.0
        boundingBoxView.frame.size.height = 160.0
        boundingBoxView.frame.origin.x = ceil((bounds.width / 2.0) - (boundingBoxView.frame.width / 2.0))
        boundingBoxView.frame.origin.y = ceil((bounds.height / 2.0) - (boundingBoxView.frame.height / 2.0))

        activityIndicatorView.frame.origin.x = ceil((bounds.width / 2.0) - (activityIndicatorView.frame.width / 2.0))
        activityIndicatorView.frame.origin.y = ceil((bounds.height / 2.0) - (activityIndicatorView.frame.height / 2.0))

        let messageLabelSize = messageLabel.sizeThatFits(CGSizeMake(160.0 - 20.0 * 2.0, CGFloat.max))
        messageLabel.frame.size.width = messageLabelSize.width
        messageLabel.frame.size.height = messageLabelSize.height
        messageLabel.frame.origin.x = ceil((bounds.width / 2.0) - (messageLabel.frame.width / 2.0))
        messageLabel.frame.origin.y = ceil(activityIndicatorView.frame.origin.y + activityIndicatorView.frame.size.height + ((boundingBoxView.frame.height - activityIndicatorView.frame.height) / 4.0) - (messageLabel.frame.height / 2.0))
    }
}

你这样使用它:

let activitiyViewController = ActivityViewController(message: "Loading...")
presentViewController(activitiyViewController, animated: true, completion: nil)

它看起来像这样:

演示控制器和动画过渡

有关使用重新创建动画的示例实现,请参阅此答案.UIAlertControllerUIViewControllerAnimatedTransitioning

Answer 2

试试这个我做了一些技巧......

以下代码适用于iPod iOS8beta5 + XCode6

UIAlertController *alert = [UIAlertController alertControllerWithTitle:nil
                                        message:@"Please wait\n\n\n"
                                 preferredStyle:UIAlertControllerStyleAlert];

    UIActivityIndicatorView *spinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
    spinner.center = CGPointMake(130.5, 65.5);
    spinner.color = [UIColor blackColor];
    [spinner startAnimating];
    [alert.view addSubview:spinner];
    [self presentViewController:alert animated:NO completion:nil];

Answer 3

Swift 3.0/4.1

要显示进度对话框:

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

let spinnerIndicator = UIActivityIndicatorView(activityIndicatorStyle: .whiteLarge)

spinnerIndicator.center = CGPoint(x: 135.0, y: 65.5)
spinnerIndicator.color = UIColor.black
spinnerIndicator.startAnimating()

alertController.view.addSubview(spinnerIndicator)
self.present(alertController, animated: false, completion: nil)

要关闭进度对话框:

alertController.dismiss(animated: true, completion: nil);

Answer 4

Swift 2.0:

 override func viewDidAppear(animated: Bool)
 {

  let alertController = UIAlertController(title: nil, message: "Please wait\n\n", preferredStyle: UIAlertControllerStyle.Alert)

  let spinnerIndicator: UIActivityIndicatorView = UIActivityIndicatorView(activityIndicatorStyle: UIActivityIndicatorViewStyle.WhiteLarge)

  spinnerIndicator.center = CGPointMake(135.0, 65.5)
  spinnerIndicator.color = UIColor.blackColor()
  spinnerIndicator.startAnimating()

  alertController.view.addSubview(spinnerIndicator)
  self.presentViewController(alertController, animated: false, completion: nil)

}

在某一点之后,我们需要隐藏警报.

alertController.dismissViewControllerAnimated(true, completion: nil)