从不在 Navstack 之上的其他 ViewController 中推送 ViewController? [英] Push Viewcontroller from within other ViewControllers that are not on top of Navstack?

问题描述

我有一个滚动视图加载到我的主视图中(带有页面控制).我想要做的是让滚动视图使用Touchesbegan"方法来寻找双击，然后让它将一个新的视图控制器推送到导航堆栈上.第二个目标似乎是不可能的.

i have a scrollview loaded into my mainview (with pagecontrol). What i want to do is to have the scrollview use the "Touchesbegan" method to look for double taps and then have it push a new viewcontroller onto the navstack. The second goal seems impossible.

我有单独的滚动视图控制器在主视图控制器中调用一个方法.该方法应该将一个新的视图控制器推送到堆栈上.它没有，但是当我从 mainviewcontrollerclass 中调用此方法时，它确实有效?！

I have the seperated scrollviewcontroller call a method in the mainviewcontroller. That method should push a new viewcontroller onto the stack. It doesnt, but when i call this method from within the mainviewcontrollerclass it does work?!

在滚动视图控制器类中:

in the scrollviewcontroller class:

MainViewController *mvcC = [[MainViewController alloc] init];
[mvcC loadMapView];
[mvcC release];

在主视图控制器类中:

-(void) loadMapView {
[[self navigationController] pushViewController:mapViewController  animated:YES];
NSLog(@"loadMapView method is called!");
}

谢谢！

推荐答案

您正在分配一个新的 MainViewController 并向其发送 -loadMapView 消息，而不是任何导航堆栈中现有的 MainViewController.因此，该方法中的 [self navigationController] 是 nil 并且 -pushViewController:animated: 方法是空操作.

You're allocating a new MainViewController and sending your -loadMapView message to that, rather than any existing MainViewController in the navigation stack. Hence, [self navigationController] in that method is nil and the -pushViewController:animated: method is a no-op.

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