Question

我遇到的问题是当我加载它时 UIViewController.removeSpinner（spinner：self.view）

它给我一个空白的黑色视图，我不知道如何从按钮功能访问sv变量：

让sv = UIViewController.displaySpinner（onView：self.view）

即时使用此灭绝来加载微调器并移除 http://brainwashinc.com/2017/07/21/loading-activity-indicator-ios-swift/

我真正想要做的事情：

1-获取语音留言的网址。

2-运行微调器以加载播放器。

3-玩。

4-如果观察者发现它已经结束，则删除微调器。

这是我的代码：

 @IBAction func vnClick(_ sender: UIButton) {
    let vnInfo = itemss[sender.tag]
    print(vnInfo.vnUrl)
    let sv = UIViewController.displaySpinner(onView: self.view)
    if let url = NSURL(string: vnInfo.vnUrl) {
        player = AVPlayer(url: url as URL)
        player.play()
        //check if ended playing to remove spinner
        NotificationCenter.default.addObserver(self,  selector:#selector(playerDidFinishPlaying(note:)),name: NSNotification.Name.AVPlayerItemDidPlayToEndTime, object: player.currentItem)


    }
}
@objc func playerDidFinishPlaying(note: NSNotification) {
    UIViewController.removeSpinner(spinner: self.view)
}

Answer 1

您应该做更像

的事情

private var sv : UIView?
 @IBAction func vnClick(_ sender: UIButton) {
    let vnInfo = itemss[sender.tag]
    print(vnInfo.vnUrl)
    sv = UIViewController.displaySpinner(onView: self.view)
    if let url = NSURL(string: vnInfo.vnUrl) {
        player = AVPlayer(url: url as URL)
        player.play()
        //check if ended playing to remove spinner
        NotificationCenter.default.addObserver(self,  selector:#selector(playerDidFinishPlaying(note:)),name: NSNotification.Name.AVPlayerItemDidPlayToEndTime, object: player.currentItem)
    }
}

@objc func playerDidFinishPlaying(note: NSNotification) {
    if let sv = sv {
        UIViewController.removeSpinner(spinner: sv) 
    }
}

Answer 2

你的错误是你在这里传递self.view，这将删除视图

playerDidFinishPlaying（）中的

UIViewController.removeSpinner（微调器： self.view ）

你需要这样做，把spinnerview对象放在按钮点击之外，

var spinnerView: UIView!

然后分配，

spinnerView = UIViewController.displaySpinner(onView: self.view)

在删除时，传递spinnerview而不是self.view

UIViewController.removeSpinner(spinner: self.spinnerView)

代码就像，

@IBAction func vnClick(_ sender: UIButton) {
let vnInfo = itemss[sender.tag]
print(vnInfo.vnUrl)
spinnerView = UIViewController.displaySpinner(onView: self.view)
if let url = NSURL(string: vnInfo.vnUrl) {
    player = AVPlayer(url: url as URL)
    player.play()
    //check if ended playing to remove spinner
    NotificationCenter.default.addObserver(self,  selector:#selector(playerDidFinishPlaying(note:)),name: NSNotification.Name.AVPlayerItemDidPlayToEndTime, object: player.currentItem)
}
}

@objc func playerDidFinishPlaying(note: NSNotification) {
    UIViewController.removeSpinner(spinner: self.spinnerView)
}

加载uiview时出现黑屏

2 个答案: