swift UIActivityIndi​​catorView 建议

Question

我有一个运行良好的 UIActivityIndi​​catorView。但我的问题是如何防止应用程序用户在显示 UIActivityIndi​​cator 时通过应用程序导航或单击按钮？我想强制用户等到我运行的代码完成。这是我到目前为止所拥有的。任何帮助将不胜感激。

class ViewController: UIViewController {
    var activityIndicator = UIActivityIndicatorView(activityIndicatorStyle: .WhiteLarge)

var timer = NSTimer()
    let delay = 4.5

override func viewDidLoad() {
    super.viewDidLoad()

    view.addSubview(activityIndicator)
    activityIndicator.translatesAutoresizingMaskIntoConstraints = false
    activityIndicator.color = UIColor.redColor()


    let horizontalConstraint = NSLayoutConstraint(item: activityIndicator, attribute: NSLayoutAttribute.CenterX, relatedBy: NSLayoutRelation.Equal, toItem: view, attribute: NSLayoutAttribute.CenterX, multiplier: 1, constant: 0)
    view.addConstraint(horizontalConstraint)

    let verticalConstraint = NSLayoutConstraint(item: activityIndicator, attribute: NSLayoutAttribute.CenterY, relatedBy: NSLayoutRelation.Equal, toItem: view, attribute: NSLayoutAttribute.CenterY, multiplier: 1, constant: 0)
    view.addConstraint(verticalConstraint)
getBalance()
}

func delayedAction(){
        // time consuming code here that will run in the background with task

dispatch_async(dispatch_get_main_queue(), { () -> Void in
                        self.lblAccountBalance.text = "Account Balance " + myResult!
                        self.activityIndicator.stopAnimating();
                    })
    }

 func 
    getBalance () {
        activityIndicator.startAnimating()
        timer = NSTimer.scheduledTimerWithTimeInterval(delay, target: self, selector: #selector(delayedAction), userInfo: nil, repeats: false)
        }

Answer 1

超级简单！

self.view.userInteractionEnabled = 假

Answer 2

从视图控制器的视图中简单地禁用用户交互可能并不总是像您预期的那样工作。如果该视图之外有任何按钮不在视图的层次结构中，那么它们将是可点击的。

您应该做的是在应用程序级别暂时停止用户交互：

UIApplication.shared.beginIgnoringInteractionEvents()
UIApplication.shared.endIgnoringInteractionEvents()