关于 ios：使 UIAlertViewController 动作不可点击？

Make UIAlertViewController action unclickable?

我想让 UIAlertAction 无法点击。基本上，当我尝试下载某些东西时，我会弹出一个 UIAlertView 。下载完成后，我希望 UIAlertView's action 从不可点击变为可点击。当它变为可点击时，表示下载已完成。这是我到目前为止所拥有的：

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@IBOutlet var activityView: UIActivityIndicatorView!

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

override func viewDidLoad(){
self.activityView = UIActivityIndicatorView(activityIndicatorStyle: UIActivityIndicatorViewStyle.WhiteLarge)
self.activityView.center = CGPointMake(130.5, 65.5)
self.activityView.color = UIColor.blackColor()
}

@IBAction func importFiles(sender: AnyObject){
self.alert.view.addSubview(activityView)
self.presentViewController(alert, animated: true, completion: nil)
alert.addAction(UIAlertAction(title:"Ok", style: UIAlertActionStyle.Default, handler: nil))
//Somehow here I want to make it so that the UIAlertAction is unclickable.
self.activityView.startAnimating()
}

一切正常，但我似乎无法找到一种方法让动作只有在动画完成后才能点击。我尝试将操作添加到 UIAlertViewController 并在下载完成后再次呈现 UIAlertViewController 但我收到一个错误消息，指出当 UIAlertViewController 已经处于活动状态时我无法呈现某些内容。任何帮助，将不胜感激。谢谢！

一般来说，我建议不要使用警报视图作为此类任务的占位符。但为了给你一个想法，看看这个：

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lazy var alert: UIAlertController = {
var alert = UIAlertController(title:"Please wait...", message:"Please wait for some seconds...", preferredStyle: .Alert)
alert.addAction(self.action)
return alert
}()
lazy var action: UIAlertAction = {
var action = UIAlertAction(title:"Ok", style: .Default, handler: nil)
action.enabled = false
return action
}()

override func viewDidAppear(animated: Bool) {
super.viewDidAppear(animated)

self.presentViewController(alert, animated: true, completion: nil)

let delayInSeconds = 3.0
let popTime = dispatch_time(DISPATCH_TIME_NOW, Int64(delayInSeconds * Double(NSEC_PER_SEC)))
dispatch_after(popTime, dispatch_get_main_queue()) { () -> Void in
self.action.enabled = true
}
}

延迟部分在哪里

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let delayInSeconds = 3.0
let popTime = dispatch_time(DISPATCH_TIME_NOW, Int64(delayInSeconds * Double(NSEC_PER_SEC)))
dispatch_after(popTime, dispatch_get_main_queue()) { () -> Void in
self.action.enabled = true
}

应该由你的获取逻辑替换。

祝你好运！