如何从presentView控制器返回到RootViewController?

[英]How to go back to RootViewController from presentView controller?


I am developing a iPhone Photos Gallery app and In my app I created one folder into gallery and that gallery folder is shown up into my app and while use click on Image its navigate to the next view controller where he can see a full size image and I set trash button there so user can delete that photos and my trashButton code is :

我正在开发一个iPhone照片库应用程序,在我的应用程序中,我创建了一个文件夹到库中,该库文件夹显示在我的应用程序中,当使用单击图像时,它导航到下一个视图控制器,在那里他可以看到一个完整的图像和我在那里设置垃圾按钮,以便用户可以删除那些照片,我的trashButton代码是:

@IBAction func btnTrash(sender: AnyObject) {

    let alert = UIAlertController(title: "Delete Image", message: "Are You Sure To delete this Image?", preferredStyle: .Alert)
    alert.addAction(UIAlertAction(title: "Yes", style: .Default, handler: {(alertAction)in
        //Delete Photo

        PHPhotoLibrary.sharedPhotoLibrary().performChanges({
            let request = PHAssetCollectionChangeRequest(forAssetCollection: self.assetCollection)
            request.removeAssets([self.photosAsset[self.index]])
            }, completionHandler: {(success, error )in
                NSLog("\nDeleted Image -> %@", (success ? "Success" : "Error"))
                alert.dismissViewControllerAnimated(true, completion: nil)

                self.photosAsset = PHAsset.fetchAssetsInAssetCollection(self.assetCollection, options: nil)
                if(self.photosAsset.count == 0){

                    // No photos Left
                    self.imgView.image = nil
                    println("No Image Left")

                    // Pop to root view controller
                    self.navigationController?.popToRootViewControllerAnimated(true)

                }
                if(self.index >= self.photosAsset.count){
                    self.index = self.photosAsset.count - 1
                }
                self.displayPhoto()
        })

    }))
    alert.addAction(UIAlertAction(title: "Cancle", style: .Cancel, handler: {(alertAction)in
    //Do not delete Photo

    self.dismissViewControllerAnimated(true, completion: nil)
    }))
    self.presentViewController(alert, animated: true, completion: nil)
}

I have set if there is not image left than use will navigate to the RootViewController with this line of code:

我设置了如果没有剩下的图像,则使用以下代码行导航到RootViewController:

 self.navigationController?.popToRootViewControllerAnimated(true)

But this is not working and when the last image is deleted I got a window:

但这不起作用,当删除最后一张图片时,我有一个窗口:

enter image description here

and my console shows up:

我的控制台出现了:

2014-11-05 16:45:11.502 Photos Gallary App[3046:115145] Adding Image to Library -> Success
2014-11-05 16:45:15.285 Photos Gallary App[3046:115146] 
Deleted Image -> Success
No Image Left
2014-11-05 16:45:15.287 Photos Gallary App[3046:115146] *** Terminating app due to uncaught exception 'NSRangeException', reason: '0x7f95fb5ef980: index (18446744073709551615) beyond bounds (0)'
*** First throw call stack:
(
    0   CoreFoundation                      0x0000000100e4f3f5 __exceptionPreprocess + 165
    1   libobjc.A.dylib                     0x000000010297dbb7 objc_exception_throw + 45
    2   CoreFoundation                      0x0000000100e4f32d +[NSException raise:format:] + 205
    3   Photos                              0x0000000100c5dd27 -[PHBatchFetchingArray objectAtIndex:] + 105
    4   Photos                              0x0000000100c63b92 -[PHFetchResult objectAtIndexedSubscript:] + 57
    5   Photos Gallary App                  0x0000000100b4d8d6 _TFC18Photos_Gallary_App9ViewPhoto12displayPhotofS0_FT_T_ + 694
    6   Photos Gallary App                  0x0000000100b50d93 _TFFFC18Photos_Gallary_App9ViewPhoto8btnTrashFS0_FPSs9AnyObject_T_U_FGSQCSo13UIAlertAction_T_U0_FTSbGSQCSo7NSError__T_ + 4243
    7   Photos Gallary App                  0x0000000100b4a6f6 _TTRXFo_dSboGSQCSo7NSError__dT__XFo_iTSbGSQS____iT__ + 38
    8   Photos Gallary App                  0x0000000100b4ed91 _TPA__TTRXFo_dSboGSQCSo7NSError__dT__XFo_iTSbGSQS____iT__ + 81
    9   Photos Gallary App                  0x0000000100b4a728 _TTRXFo_iTSbGSQCSo7NSError___iT__XFo_dSboGSQS___dT__ + 40
    10  Photos Gallary App                  0x0000000100b4a788 _TTRXFo_dSboGSQCSo7NSError__dT__XFdCb_dV10ObjectiveC8ObjCBooldGSQS___dT__ + 88
    11  libdispatch.dylib                   0x000000010541ccc6 _dispatch_call_block_and_release + 12
    12  libdispatch.dylib                   0x000000010543a7f4 _dispatch_client_callout + 8
    13  libdispatch.dylib                   0x0000000105425193 _dispatch_root_queue_drain + 1094
    14  libdispatch.dylib                   0x000000010542663c _dispatch_worker_thread2 + 52
    15  libsystem_pthread.dylib             0x00000001057d0ef8 _pthread_wqthread + 314
    16  libsystem_pthread.dylib             0x00000001057d3fb9 start_wqthread + 13
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb) 

Can anybody tell me what is happening and what is the solution for this?

任何人都可以告诉我发生了什么,解决方案是什么?

4 个解决方案

#1


12  

What is the method self.displayPhoto() doing? Do you want to call it after pop? It seems weird.

self.displayPhoto()的做法是什么?你想在流行后打电话吗?这看起来很奇怪。

Try adding a "return" at the line after self.navigationController?.popToRootViewControllerAnimated(true) to make sure that the execution stops there.

尝试在self.navigationController?.popToRootViewControllerAnimated(true)之后的行添加“return”以确保执行在那里停止。

#2


3  

I found solution for my question is :

我发现我的问题的解决方案是:

 @IBAction func btnTrash(sender: AnyObject) {

    let alert = UIAlertController(title: "Delete Image", message: "Are You Sure To delete this Image?", preferredStyle: .Alert)
    alert.addAction(UIAlertAction(title: "Yes", style: .Default, handler: {(alertAction)in
        //Delete Photo

        PHPhotoLibrary.sharedPhotoLibrary().performChanges({
            let request = PHAssetCollectionChangeRequest(forAssetCollection: self.assetCollection)
            request.removeAssets([self.photosAsset[self.index]])
            }, completionHandler: {(success, error )in
                NSLog("\nDeleted Image -> %@", (success ? "Success" : "Error"))

                alert.dismissViewControllerAnimated(true, completion: nil)

                // here is the code for go back to root view controller

                if(success){
                    // Move to the main thread to execute
                    dispatch_async(dispatch_get_main_queue(), {
                        self.photosAsset = PHAsset.fetchAssetsInAssetCollection(self.assetCollection, options: nil)
                        if(self.photosAsset.count == 0){
                            println("No Images Left!!")
                            self.navigationController?.popToRootViewControllerAnimated(true)
                        }else{
                            if(self.index >= self.photosAsset.count){
                                self.index = self.photosAsset.count - 1
                            }
                            self.displayPhoto()
                        }
                    })
                }else{
                    println("Error: \(error)")
                }
        })


    }))
    alert.addAction(UIAlertAction(title: "Cancle", style: .Cancel, handler: {(alertAction)in
    //Do not delete Photo

    self.dismissViewControllerAnimated(true, completion: nil)
    }))
    self.presentViewController(alert, animated: true, completion: nil)
}

#3


1  

Have you tried with this line of code :

你尝试过这行代码吗?

self.presentingViewController!.dismissViewControllerAnimated(true, completion: nil)

#4


0  

When you don't have any photos left and do the popToRoot, it continues executing this lines:

当你没有剩下任何照片并执行popToRoot时,它会继续执行以下行:

alert.addAction(UIAlertAction(title: "Cancle", style: .Cancel, handler: {(alertAction)in
//Do not delete Photo

self.dismissViewControllerAnimated(true, completion: nil)
}))
self.presentViewController(alert, animated: true, completion: nil)

Try commenting them to see if the problem is there, and if it is, uncomment for solving it.

尝试对它们进行评论以查看问题是否存在,如果存在,则取消注释以解决问题。

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