iOS : Handle multiple uilocalnotification with multiple same viewcontroller

Question

我正在使用 UILocalnotification...收到通知时，当应用程序处于事件模式时我打开 viewcontroller...但是如果同时收到多个通知...我如何打开多个 viewcontroller...以上彼此并依次解散它们....我尝试打开 viewcontroller 但收到此错误

Warning: Attempt to present <NotificationViewController: 0x7fc033b43900> on <UINavigationController: 0x7fc031859600> whose view is not in the window hierarchy!

Answer 1

有一个 hack 可以做到这一点。

编写 View Controller 的扩展:

extension UIViewController {
    var lastPresentedViewController: UIViewController {
        guard let presentedViewController = presentedViewController else { return self }
        return presentedViewController.lastPresentedViewController()
    }
}

或对象:

UIViewController+LastPresentedViewController.h:

@interface UIViewController (LastPresentedViewController)
-(UIViewController *)lastPresentedViewController;
@end

UIViewController+LastPresentedViewController.m:

@implementation UIViewController (LastPresentedViewController)
- (UIViewController *)lastPresentedViewController {
    if (self.presentedViewController) {
        return [self.presentedViewController lastPresentedViewController];
    } else {
        return self;
    }
}
@end

当您需要从 navigationController 中呈现 View Controller 时，只需像这样调用此方法:

navigationController.lastPresentedViewController.presentViewController(....

如果您已经在 navigationController 中，只需调用 lastPresentedViewController.presentViewController(...