設置UIActivityIndi​​catorView背景

Question

我很難爲活動指示器背景找到合適的解決方案。我想在視圖控制器加載時爲活動指示器設置動畫，並且爲指示器後面的整個視圖控制器設置灰色透明背景，同時它動畫。一旦指標停止動畫，灰色透明背景應該被移除，用戶應該能夠恢復屏幕上的交互。

我認爲這是應用程序的標準，但我一直無法在Swift中找到一個好的解決方案。下面是我的代碼到目前爲止設置活動指示燈：

let indicator: UIActivityIndicatorView = UIActivityIndicatorView() 
indicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.White 
indicator.hidesWhenStopped = true 
indicator.center = self.view.center 
self.view.addSubview(indicator) 
indicator.startAnimating() 

Answer 1

可以爲指標的背景創建一個UIView：

func showActivityIndicatory(uiView: UIView) { 
    var container: UIView = UIView() 
    container.frame = uiView.frame 
    container.center = uiView.center 
    container.backgroundColor = UIColorFromHex(0xffffff, alpha: 0.3) 

    var loadingView: UIView = UIView() 
    loadingView.frame = CGRectMake(0, 0, 80, 80) 
    loadingView.center = uiView.center 
    loadingView.backgroundColor = UIColorFromHex(0x444444, alpha: 0.7) 
    loadingView.clipsToBounds = true 
    loadingView.layer.cornerRadius = 10 

    var actInd: UIActivityIndicatorView = UIActivityIndicatorView() 
    actInd.frame = CGRectMake(0.0, 0.0, 40.0, 40.0); 
    actInd.activityIndicatorViewStyle = 
       UIActivityIndicatorViewStyle.WhiteLarge 
    actInd.center = CGPointMake(loadingView.frame.size.width/2, 
       loadingView.frame.size.height/2); 
    loadingView.addSubview(actInd) 
    container.addSubview(loadingView) 
    uiView.addSubview(container) 
    actInd.startAnimating() 
} 

編號：https://coderwall.com/p/su1t1a/ios-customized-activity-indicator-with-swift