UIAlertController没有在模态UIViewController上显示？

Question

在视图控制器（A）中，另一个视图控制器（B）将显示为模态VC。

设置以下属性VC（B）并将其显示在关键窗口中的topViewController不起作用。

B.providesPresentationContextTransitionStyle = YES;
B.definesPresentationContext = YES;
[B setModalPresentationStyle:UIModalPresentationOverCurrentContext];



- (void)presentViewControllerInKeyWindow:(UIViewController*)viewController animated:(BOOL)animated completion:(void (^)(void))completion
{

    UIViewController *topViewController = [UIApplication sharedApplication].keyWindow.rootViewController;

    if(topViewController.presentedViewController != nil) {

        topViewController = [UIApplication sharedApplication].keyWindow.rootViewController.presentedViewController;
        while(topViewController.presentedViewController) {
            topViewController = topViewController.presentedViewController;
        }

    }

    [topViewController presentViewController:viewController animated:animated completion:completion];
}

没有显示alertcontroller而是抛出错误。错误表示VC已经出现。

Answer 1

检查您是否有任何名为inputView或inputAccessoryView的属性。如果是，则更改这些名称并尝试。