[英]How to go back in the navigation stack?
My app has 7 subsequent view controllers: VC1 - VC7 我的应用程序有7个后续视图控制器:VC1 - VC7
In my navigation bar I have a back button with to actions: tapped and longPressed. 在我的导航栏中,我有一个带有动作的后退按钮:tapped和longPressed。 When the backButton gets pressed long in any VC, the app should go to VC2 and present it as if the user went from VC1 to VC2, specifically: with the right back button tapped action.
当backButton在任何VC中被长按时,应用程序应该转到VC2并呈现它,好像用户从VC1转到VC2,具体是:使用右后退按钮轻击动作。
This is my code for UILongPressGestureRecognizer: 这是我的UILongPressGestureRecognizer代码:
func longPressAction(gestureRecognizer: UIGestureRecognizer) {
if (gestureRecognizer.state == UIGestureRecognizerState.Ended) {
println("Long press ended")
} else if (gestureRecognizer.state == UIGestureRecognizerState.Began) {
println("Long press detected")
let mainStoryboard = UIStoryboard(name: "Main", bundle: NSBundle.mainBundle())
let vc: ViewController2 = mainStoryboard.instantiateViewControllerWithIdentifier("vc2") as! ViewController2
navigationController?.pushViewController(vc, animated: true)
}
}
How can I go back to the right place in the navigation stack ? 如何返回导航堆栈中的正确位置?
You can set your array of View Controllers in the Navigation Controller: 您可以在导航控制器中设置视图控制器阵列:
let viewControllersArray = [VC1,VC2]
self.navigationController.setViewControllers(viewControllersArray, animated: true)
EDIT 编辑
In Your Scenario 在您的场景中
else if (gestureRecognizer.state == UIGestureRecognizerState.Began) {
println("Long press detected")
let mainStoryboard = UIStoryboard(name: "Main", bundle: NSBundle.mainBundle())
let vc1: ViewController1 = mainStoryboard.instantiateViewControllerWithIdentifier("vc1") as! ViewController1
let vc2: ViewController2 = mainStoryboard.instantiateViewControllerWithIdentifier("vc2") as! ViewController2
let VCArray = [vc1,vc2]
self.navigationController.setViewControllers(VCArray, animated: true)
}
I can think of two ways to accomplish this: 我可以想到两种方法来实现这个目标:
Set VC2 as your Root view Controller and then use popToRootViewControllerAnimated
. 将VC2设置为Root视图Controller,然后使用
popToRootViewControllerAnimated
。 Its cleaner IMO if VC2 is your primary Controller that gets called so often. 如果VC2是你经常被调用的主要控制器,它的清洁IMO。
Maintain a boolean to denote if VC2 is loaded in the stack yet. 保持一个布尔值来表示VC2是否已加载到堆栈中。 If loaded then just use
popToViewController
, and if not yet loaded in memory then just pushViewController
and push VC2. 如果加载然后只使用
popToViewController
,如果还没有加载到内存中那么只需pushViewController
并推送VC2。
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