Swift 3,Xcode 8.1.我想在UIViewController中显示UIAlertController.
我有方法：
private static func rootViewController() -> UIViewController {
// cheating,I know
return UIApplication.shared.keyWindow!.rootViewController!
}
static func presentAlert(_ message: String) {
let alertView = UIAlertController(title: "RxExample",message: message,preferredStyle: .alert)
alertView.addAction(UIAlertAction(title: "OK",style: .cancel) { _ in })
rootViewController().present(alertView,animated: true,completion: nil)
}
Full code of this class you can find here
我在viewDidLoad中调用presentAlert方法：
override func viewDidLoad() {
super.viewDidLoad()
DefaultWireframe.presentAlert("test")
...
}
并得到警告：
Warning: Attempt to present UIAlertController: 0x7f904ac0d930 on UIViewController: 0x7f904ad08040 whose view is not in the window hierarchy!
如何避免警告并显示警报？
它在我尝试在初始ViewController中显示Alert时有效,但它在使用push segue与初始VC连接的另一个ViewController中不起作用.
