“请稍等” iOS8中的对话框 [英] "Please wait" dialog in iOS8

问题描述

我曾经在我的应用中长时间使用请稍候对话框。使用 UIActivityIndi​​catorView 并将其添加到 UIAlertView 是非常简单的事情。

I used to have a "Please wait" dialog in my app for long time. It was quite simple thing using UIActivityIndicatorView and adding it to UIAlertView.

然而，iOS8引入了 UIAlertController 。是否可以添加任何东西以产生类似的效果？有没有其他方法可以用iOS8做这样的事情？

However iOS8 introduced UIAlertController. Is it possible to add anything to it to have similiar effect? Is there another way of doing such thing with iOS8?

我搜索了很多网站，但仍然不知道如何使用新的API。

I have searched a lot of sites and still have no idea how it can be done with the new API.

我很感激任何答案 - 链接到libs，教程等，这可能会有所帮助。

I would appreciate any answers - links to libs, tutorials etc., which could be helpful.

问候，

Mateusz

推荐答案

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

Instead of using a UIAlertController, you can use a custom UIViewController that is presented modally. Here is what I use in Swift 2.0:

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：

请参阅此答案一个示例实现，使用 UIViewControllerAnimatedTransitioning 重新创建 UIAlertController 动画。

See this answer for a sample implementation that recreates the UIAlertController animation using UIViewControllerAnimatedTransitioning.

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