iphone - ios5 登录屏幕卡住

Question

我从应用程序委托(delegate)中设置了一个登录屏幕，如下所示:

  NSUserDefaults *def = [NSUserDefaults standardUserDefaults];
BOOL needsPassCheck = [def boolForKey:kHasPassword];
if (needsPassCheck) {
    UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:@"MainStoryboard_iPhone" bundle: nil];

    VerifyPasswordViewController *passC = (VerifyPasswordViewController *)[mainStoryboard instantiateViewControllerWithIdentifier:@"passCheck"];
    passC.loginCheck = YES;
    self.window.rootViewController = passC;
}

在 View Controller 中启动方法是:

    - (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    if (self.loginCheck) {
        [self.topBar setHidden:YES];
        self.enterPLabel.text = NSLocalizedString(@"Enter Password", @"Enter Password");
    }else {
        [self.topBar setHidden:NO];
        self.enterPLabel.text = NSLocalizedString(@"Enter Old Password", @"Enter Old Password");
    }

    [self.continueButton setTitle:NSLocalizedString(@"Continue", @"Continue") forState:UIControlStateNormal];
 }

-(void)viewDidAppear:(BOOL)animated
{

    [self.passwordTextField becomeFirstResponder];

    [self viewDidAppear:animated];

}

问题在于它似乎陷入了无限循环: http://i.imgur.com/KmarG.png

有什么问题吗？我如何解决它？

Answer 1

是的，很明显，你的代码中有递归。在每个 viewDidAppear 中，您调用另一个 viewDidAppear。而不是:

[self viewDidAppear:animated];

调用:

[super viewDidAppear:animated];