iOS：使用多个相同的viewcontroller处理多个uilocalnotification

Question

我正在使用UILocalnotification ...接收通知我在应用处于活动模式时打开viewcontroller ...但是如果同时收到多个通知...我如何打开多个viewcontroller ...上面彼此并顺序解雇它们....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

有一个黑客可以做到这一点。

为视图控制器写一个扩展名：

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

或objc：

的UIViewController + LastPresentedViewController.h：

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

的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呈现视图控制器时，只需调用此方法：

navigationController.lastPresentedViewController.presentViewController(....

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