ios - 如何永久关闭我的登录 View ？

Question

到目前为止，我已经通过在第一个 View Controller 中使用 viewDidAppear 中的方法让登录 View 出现在应用程序的开头，但是一旦用户名和密码获得 Web 服务的批准，第一个 View Controller 出现一瞬间，然后立即返回登录 View 。

我是不是忘记了什么？？？我只在我的登录 View 和我的第一个 View 中进行编码。

第一次编码:

 - (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];

    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
    UIViewController *vc = [storyboard instantiateViewControllerWithIdentifier:@"LoginViewController"];
    [vc setModalPresentationStyle:UIModalPresentationFullScreen];

    [self presentModalViewController:vc animated:YES];
    [self dismissModalViewControllerAnimated:YES];

}

这是我的登录 View 中的编码

    - (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName 
  namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName 
{ 
    NSMutableString *Yes =[[NSMutableString alloc] initWithString:@"Y"];

    if ([ capturedCharacters isEqualToString:Yes])
    {
            //[self presentModalViewController:vc animated:YES];

        [self dismissModalViewControllerAnimated:YES];  
    }
    else
    {
        // ask user to login again, 
    }

   [capturedCharacters release];
    capturedCharacters = nil;

    if ([elementName isEqualToString:@"str_partinfo"]) {
        // We are no longer in an item element
        inItemElement = NO;

    }
}

我正在使用标签栏模板

Answer 1

通过调用:

 - (void)viewDidAppear:(BOOL)animated

每次您的父 View Controller 进入 View 时，您都会呈现登录 View 。我认为实际发生的情况是，当登录 View 被关闭时，“viewDidAppear”会触发，再次调用登录 View 。

尝试将逻辑放入 -(void)viewDidLoad 中，看看是否有效:

  - (void)viewDidLoad
 {
     [super viewDidLoad];

     UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
     UIViewController *vc = [storyboard instantiateViewControllerWithIdentifier:@"LoginViewController"];
     [vc setModalPresentationStyle:UIModalPresentationFullScreen];

     [self presentModalViewController:vc animated:YES];
     [self dismissModalViewControllerAnimated:YES];

 } 

或者，您可以有一个 BOOL 指针，伪代码:

 BOOL loginSuccessful;
 if(!loginSuccessful)
 {
      //ShowLogin
      loginSuccessful = TRUE;

 }