Swift3 UIAlertController相关用法总结

基本用法

alert

    func showAlert() {
        let alert = UIAlertController(title: "title",
                                      message: "message",
                                      preferredStyle: UIAlertControllerStyle.alert)
        let defaultAction = UIAlertAction(title: "default",
                                          style: UIAlertActionStyle.default,
                                          handler:{ (action: UIAlertAction) -> Void in
                                            print("UIAlertController action :",action.title ?? "default");
        })
        
        let cancelAction = UIAlertAction(title: "cancel",
                                         style: UIAlertActionStyle.cancel,
                                         handler:{ (action: UIAlertAction) -> Void in
                                            print("UIAlertController action :", action.title ?? "cancel");
        })
        let destructiveAction = UIAlertAction(title: "destructive",
                                              style: UIAlertActionStyle.destructive,
                                              handler:{ (action: UIAlertAction) -> Void in
                                                print("UIAlertController action :", action.title ?? "cancel");
        })
        
        
        alert.addAction(defaultAction);
        alert.addAction(cancelAction);
        alert.addAction(destructiveAction);
        present(alert, animated: true, completion: {
            print("UIAlertController present");
        })
    }