如何更改UIAction表取消按钮背景颜色

Question

我试图更改UIAction表“取消”按钮的背景颜色，但它不起作用。 这里是我的代码片段

if let subview = alertController.view.subviews.first, let alertContentView = subview.subviews.first { 
    for innerView in alertContentView.subviews { 
     innerView.backgroundColor = UIColor.red//StyleKit.popoverDefaultBackgroundColor 
     //drop shadow 
     innerView.layer.masksToBounds = false 
     innerView.layer.shadowOpacity = 0.8 
    } 
} 
let subview = alertController.view.subviews.last! as UIView 
let alertContentView = subview.subviews.last! as UIView 
alertContentView.backgroundColor = UIColor.black 

let cancelAction = UIAlertAction(title: "Cancel".localize(), style: .cancel) 

alertController.addAction(changeAction) 
alertController.addAction(cancelAction) 

Answer 1

试试这个 - let subView = alertController.view.subviews.first! Var alertContentView = subView.subviews.first! alertContentView.backgroundColor = UIColor.black alertContentView.layer.cornerRadius = 5