处理我的故事板的segues和下一个屏幕

Question

if (self.txtusername.text.isEmpty)
{
    (UIAlertView(title: "Fields cant be empty", message: "Please Enter username and password",
     delegate: nil, cancelButtonTitle: "OK").show())
     self.dismissViewControllerAnimated(true, completion: nil)
}
else if (range==nil)
{
    (UIAlertView(title: "Invalid Email Id", message: "Type mail id like xxx@yyy.zzz", delegate: nil, cancelButtonTitle: "OK").show())
    self.dismissViewControllerAnimated(true, completion: nil)
}

我在登录时使用此代码提醒用户，但警报消息弹出到我下次看到的... 我想在登录页面中发出警报，它不应该显示我的下一个屏幕如何做到这一点？

Answer 1

就这样做

if(responseData != "\"Valid user\"")
                {
                var alertView:UIAlertView = UIAlertView()
                    alertView.title = "Failed"
                    alertView.message = responseData
                    alertView.delegate = self
                    alertView.addButtonWithTitle("OK")
                    alertView.show()
                    //self.dismissViewControllerAnimated(true, completion: nil)
                    //let vc = LoginController()

                    return;
                }

可以很轻松地帮助你。

HTH，享受编码!!

Answer 2

试试这段代码。

  UIAlertView *alert = [[UIAlertView alloc] initWithTitle: @"Fields cant be empty"
                                                    message:@"Please Enter username and password"
                                                   delegate:nil
                                          cancelButtonTitle:@"Cancel"
                                          otherButtonTitles:@"OK", nil];
[alert show];

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex (NSInteger)buttonIndex** 
{
    if (buttonIndex == 0){
         //your code...
    }
    else{
         NSLog(@"cancel");
    }
}