ios - UIAlertController 未显示在模态 UIViewController 上？

Question

在 viewcontroller(A) 中，另一个 viewcontroller(B) 将作为模态 VC 出现。

设置以下属性呈现 VC(B) 并将其呈现给关键窗口中的 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。错误说 VC 已经出现。

Answer 1

检查是否有名为 inputView 或 inputAccessoryView 的属性。如果是，则更改这些名称并尝试。