Question

点击按钮后，我有一个操作打开网址，我想知道如何对其进行编程，以便在Facebook = "0"时出现UIAlertController。

更新并正常运行的代码是：

let action2 = UIAlertAction(title: "Facebook", style: UIAlertActionStyle.Default) { (action) in

   if self.facebook == "0" {

     let alert = UIAlertController(title: "Lo sentimos", message: "La cofradía no dispone de Facebook, inténtalo a través de otro medio", preferredStyle: UIAlertControllerStyle.Alert)

let action1 = UIAlertAction(title: "Atrás", style: UIAlertActionStyle.Cancel, handler: nil)

       alert.addAction(action1)
       self.presentViewController(alert, animated: true, completion: nil);

        } else {

          UIApplication.sharedApplication().openURL(NSURL(string: "http://facebook.com/\(self.facebook)")!)

 }

Answer 1

在打开网址之前，只需检查它是否为空：

// I'm assuming facebook is a String that is empty if it isn't set

if facebook != "" {
    UIApplication.sharedApplication().openURL(NSURL(string: "http://facebook.com/\(self.facebook)")!)
} else {
    // Open alertcontroller here
}

当没有数据时，不执行动作

1 个答案: