Question

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    // Initialize Alert View
    let alertController = UIAlertController(title: "No Internet connection", message: "Please Connect to Internet", preferredStyle: .Alert)

    let EXITAction = UIAlertAction(title: "EXIT", style: .Destructive) {(action) in
        //...
        exit(0)

    }
    alertController.addAction(EXITAction)

    self.presentViewController(alertController, animated: true) {
        // ...
    }


}

如果使用click然后退出，我试图将此用于onLoad。但什么都没发生。请帮忙

（我在编程方面很新）

Answer 1

您必须移动代码才能将WAR_REPORT_MSG1 = " AND regexp_like(pe.answer_recived,'^[^0-9]*[?][^0-9]*$') ";呈现给UIAlertController方法。

如果您在viewDidAppear中放置修改用户界面的代码，则不会将其应用于视图，因为视图控制器仍在加载。

Answer 2

只需声明如下函数即可，您可以在In [164]: df.loc[df['FAV_FRUIT']==True, 'FAV_FRUIT'] = df['fruit'] df[df['FAV_FRUIT']!=False].drop_duplicates() Out[164]: cust fruit FAV_FRUIT 0 A MANGO MANGO 6 B APPLE APPLE方法中将其称为viewDidAppear()。

alert("Message String")

UIAlertController无法正常工作

2 个答案: