Ios 在Swift中更改UIAlertController上一个或特定按钮的颜色

我有一个UIController的操作表类型，它显示两个项目，第一个是“从应用程序注销”，另一个是“取消”。我想将显示“从应用程序注销”的按钮的字体颜色更改为红色，并将“取消”按钮保留为默认颜色。我该怎么做？下面是我的代码：

let cancelActionSheetButton = UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Cancel) { 
    (cancelSelected) -> Void in
    print("Cancel Selected")
}

let logoutActionSheet = UIAlertController(title:"Logout", message: nil, preferredStyle: UIAlertControllerStyle.ActionSheet)

let logoutActionSheetButton = UIAlertAction(title: "Logout from App", style: UIAlertActionStyle.Default) { 
    (logoutSelected) -> Void in
}

logoutActionSheet.addAction(logoutActionSheetButton)
logoutActionSheet.addAction(cancelActionSheetButton)

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

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尝试使用

UIAlertActionStyle.Destructive

let logoutActionSheetButton=UIAlertAction(title: "Logout from App", style: UIAlertActionStyle.Destructive) { ... }