Question

我使用一些文本字段和两个按钮制作UIAlertController。我有按钮注册。单击按钮注册时如何保持UIAlertController。因为我在按钮中运行了一些方法后，我的UIAlertController关闭了。点击按钮注册后请帮我保留UIAlertController。我如何在UIAlertController中验证文本字段？

UIAlertController * alertController = [UIAlertController alertControllerWithTitle: @"Login"
                                                                                                                        message: @"Input username and password"
                                                                                                                 preferredStyle:UIAlertControllerStyleAlert];
                                              [alertController addTextFieldWithConfigurationHandler:^(UITextField *textField) {
                                                  textField.placeholder = @"username";
                                                  textField.textColor = [UIColor blueColor];
                                                  textField.clearButtonMode = UITextFieldViewModeWhileEditing;
                                                  textField.borderStyle = UITextBorderStyleRoundedRect;
                                                  textField.text=username;
                                                  textField.userInteractionEnabled = NO;

                                              }];
                                              [alertController addTextFieldWithConfigurationHandler:^(UITextField *textField) {
                                                  textField.placeholder = @"email";
                                                  textField.textColor = [UIColor blueColor];
                                                  textField.clearButtonMode = UITextFieldViewModeWhileEditing;
                                                  textField.borderStyle = UITextBorderStyleRoundedRect;
                                                  textField.text=email;
                                                  textField.userInteractionEnabled = NO;

                                              }];
                                              [alertController addTextFieldWithConfigurationHandler:^(UITextField *textField) {
                                                  textField.placeholder = @"tell";
                                                  textField.textColor = [UIColor blueColor];
                                                  textField.clearButtonMode = UITextFieldViewModeWhileEditing;
                                                  textField.borderStyle = UITextBorderStyleRoundedRect;
                                              }];
                                              [alertController addTextFieldWithConfigurationHandler:^(UITextField *textField) {
                                                  textField.placeholder = @"address";
                                                  textField.textColor = [UIColor blueColor];
                                                  textField.clearButtonMode = UITextFieldViewModeWhileEditing;
                                                  textField.borderStyle = UITextBorderStyleRoundedRect;
                                              }];
                                              [alertController addTextFieldWithConfigurationHandler:^(UITextField *textField) {
                                                  textField.placeholder = @"city";
                                                  textField.textColor = [UIColor blueColor];
                                                  textField.clearButtonMode = UITextFieldViewModeWhileEditing;
                                                  textField.borderStyle = UITextBorderStyleRoundedRect;
                                              }];
                                              [alertController addTextFieldWithConfigurationHandler:^(UITextField *textField) {
                                                  textField.placeholder = @"national";
                                                  textField.textColor = [UIColor blueColor];
                                                  textField.clearButtonMode = UITextFieldViewModeWhileEditing;
                                                  textField.borderStyle = UITextBorderStyleRoundedRect;
                                              }];
                                              [alertController addTextFieldWithConfigurationHandler:^(UITextField *textField) {
                                                  textField.placeholder = @"postcode";
                                                  textField.textColor = [UIColor blueColor];
                                                  textField.clearButtonMode = UITextFieldViewModeWhileEditing;
                                                  textField.borderStyle = UITextBorderStyleRoundedRect;
                                              }];
                                              [alertController addAction:[UIAlertAction actionWithTitle:@"cancel" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
                                                  n++;
                                                  FBSDKLoginManager *loginManager = [[FBSDKLoginManager alloc] init];
                                                  [loginManager logOut];
                                                  [sender setTitle:@"Login with facebook" forState:UIControlStateNormal];

                                              }]];
                                              [alertController addAction:[UIAlertAction actionWithTitle:@"Register" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
                                                  NSArray * textfields = alertController.textFields;
                                                  UITextField * usernamefield = textfields[0];
                                                  UITextField * emailfield = textfields[1];
                                                  UITextField * tellfield = textfields[2];
                                                  UITextField * addressfield = textfields[3];
                                                  UITextField * cityfield = textfields[4];
                                                  UITextField * nationalfield = textfields[5];
                                                  UITextField * postcodefield = textfields[6];
                                                  //NSLog(@"%@:%@:%@:%@:%@:%@",usernamefield.text,emailfield.text,tellfield.text,
                                                  //     addressfield.text,cityfield.text,nationalfield.text,postcodefield.text);



                                                  NSInteger success=0;  
 }]];

                                              [self presentViewController:alertController animated:YES completion:nil];

请帮帮我！谢谢！

Answer 1

默认情况下不可能。由于默认行为会在操作按钮上单击警报控制器。

根据您的需要，您应该使用tableview或自定义视图来管理注册。

显示包含文本字段和按钮或表视图的自定义视图以实现此目的

Alert controller不适用于此类任务。它仅代表alertview或actionsheet，并且两者的默认行为都是在点击时解除。

与Alert controller或alertview不同，

actionsheet没有任何委托方法。所以使用警报控制器很难管理它。

然后，如果您只想使用警报控制器，那么您可以从其操作的完成处理程序中显示另一个控制器。

您应该保留以前填充的文本字段的记录，以便再次显示在警报控制器上。

希望这会有所帮助：）

Answer 2

是的，您无法更改Alertcontroller的默认行为。要么必须使用View for Register，要么必须从操作中提出另一个警报。

单击按钮时如何保留UIAlertController？

2 个答案: