Swift 4 app crashes when open file from icloud

I have a problem that my app crashes when it is opening a file from iCloud. If I open this file from my app with a Document Picker, everything is fine. But if I try to open from outside my app, for example from iCloud or safari download it crashes. If I open it from local storage "my iphone" it is also working. It is interesting because it was good one week ago :)

So in AppDelegate, I've implemented the following method:

func application(_ app: UIApplication, open url: URL, options: [UIApplication.OpenURLOptionsKey : Any] = [:]) -> Bool {}

According to the logs the crash occurs because the file does not exist.

file:///private/var/mobile/Library/Mobile%20Documents/com~apple~CloudDocs/Desktop/twic1121.pgn

This is the result if I print the URL from the parameter. I think this means that the file is there.

But if i do this: print(fm.fileExists(atPath: url.path)) then this is false.

So it is obvious that after let dataFromFile = fm.contents(atPath: url.path)
this is nil.

I have no idea what could be the problem here. So the real question here is why this is nil?

edited Nov 21 '18 at 18:26

Surjeet

7,97622543

asked Nov 21 '18 at 17:51

Dániel Grimm

189

1

Try calling startAccessingSecurityScopedResource() on your URL first. (See developer.apple.com/documentation/foundation/nsurl/…)

– Sven
Nov 21 '18 at 18:02

This works if the file has already downloaded to the phone. So if there is a small cloud icon in the upright corner of the file this is not working, anyway I'm one step ahead than before, so thanks!

– Dániel Grimm
Nov 21 '18 at 19:08

Sorry, I don’t know all the details either. Try to look at the FileManager methods startDownloadingUbiquitousItem(at:) and isUbiquitousItem(at:). Also try using the URLs directly instead of getting the path.

– Sven
Nov 21 '18 at 19:54

It is interesting, because if I would like to open a file which is not downloaded yet, just the placeholder icon is there, if I try this from a Document Picker, then it downloads first and then opens. But from outside the app, if I tap on it, it just opens immediately (of course, the file does not exist at that point, just its icon). I 've found already this startDownloadingUbiquitousItem before, but I don't understand why it hasn't got any callback? It just starts the download, but I don't know when it is finished. Thanks to your help, I really appreciate that.

– Dániel Grimm
Nov 21 '18 at 20:19

add a comment |

So in AppDelegate, I've implemented the following method:

func application(_ app: UIApplication, open url: URL, options: [UIApplication.OpenURLOptionsKey : Any] = [:]) -> Bool {}

According to the logs the crash occurs because the file does not exist.

file:///private/var/mobile/Library/Mobile%20Documents/com~apple~CloudDocs/Desktop/twic1121.pgn

This is the result if I print the URL from the parameter. I think this means that the file is there.

But if i do this: print(fm.fileExists(atPath: url.path)) then this is false.

So it is obvious that after let dataFromFile = fm.contents(atPath: url.path)
this is nil.

I have no idea what could be the problem here. So the real question here is why this is nil?

edited Nov 21 '18 at 18:26

Surjeet

7,97622543

asked Nov 21 '18 at 17:51

Dániel Grimm

189

1

Try calling startAccessingSecurityScopedResource() on your URL first. (See developer.apple.com/documentation/foundation/nsurl/…)

– Sven
Nov 21 '18 at 18:02

This works if the file has already downloaded to the phone. So if there is a small cloud icon in the upright corner of the file this is not working, anyway I'm one step ahead than before, so thanks!

– Dániel Grimm
Nov 21 '18 at 19:08

Sorry, I don’t know all the details either. Try to look at the FileManager methods startDownloadingUbiquitousItem(at:) and isUbiquitousItem(at:). Also try using the URLs directly instead of getting the path.

– Sven
Nov 21 '18 at 19:54

It is interesting, because if I would like to open a file which is not downloaded yet, just the placeholder icon is there, if I try this from a Document Picker, then it downloads first and then opens. But from outside the app, if I tap on it, it just opens immediately (of course, the file does not exist at that point, just its icon). I 've found already this startDownloadingUbiquitousItem before, but I don't understand why it hasn't got any callback? It just starts the download, but I don't know when it is finished. Thanks to your help, I really appreciate that.

– Dániel Grimm
Nov 21 '18 at 20:19

add a comment |

So in AppDelegate, I've implemented the following method:

func application(_ app: UIApplication, open url: URL, options: [UIApplication.OpenURLOptionsKey : Any] = [:]) -> Bool {}

According to the logs the crash occurs because the file does not exist.

file:///private/var/mobile/Library/Mobile%20Documents/com~apple~CloudDocs/Desktop/twic1121.pgn

This is the result if I print the URL from the parameter. I think this means that the file is there.

But if i do this: print(fm.fileExists(atPath: url.path)) then this is false.

So it is obvious that after let dataFromFile = fm.contents(atPath: url.path)
this is nil.

I have no idea what could be the problem here. So the real question here is why this is nil?

edited Nov 21 '18 at 18:26

Surjeet

7,97622543

asked Nov 21 '18 at 17:51

Dániel Grimm

189

So in AppDelegate, I've implemented the following method:

func application(_ app: UIApplication, open url: URL, options: [UIApplication.OpenURLOptionsKey : Any] = [:]) -> Bool {}

According to the logs the crash occurs because the file does not exist.

file:///private/var/mobile/Library/Mobile%20Documents/com~apple~CloudDocs/Desktop/twic1121.pgn

This is the result if I print the URL from the parameter. I think this means that the file is there.

But if i do this: print(fm.fileExists(atPath: url.path)) then this is false.

So it is obvious that after let dataFromFile = fm.contents(atPath: url.path)
this is nil.

I have no idea what could be the problem here. So the real question here is why this is nil?

ios swift file icloud

edited Nov 21 '18 at 18:26

Surjeet

7,97622543

asked Nov 21 '18 at 17:51

Dániel Grimm

189

edited Nov 21 '18 at 18:26

Surjeet

7,97622543

asked Nov 21 '18 at 17:51

Dániel Grimm

189

edited Nov 21 '18 at 18:26

Surjeet

7,97622543

edited Nov 21 '18 at 18:26

Surjeet

7,97622543

edited Nov 21 '18 at 18:26

Surjeet

7,97622543

asked Nov 21 '18 at 17:51

Dániel Grimm

189

asked Nov 21 '18 at 17:51

Dániel Grimm

189

asked Nov 21 '18 at 17:51

Dániel Grimm

189

1

Try calling startAccessingSecurityScopedResource() on your URL first. (See developer.apple.com/documentation/foundation/nsurl/…)

– Sven
Nov 21 '18 at 18:02

This works if the file has already downloaded to the phone. So if there is a small cloud icon in the upright corner of the file this is not working, anyway I'm one step ahead than before, so thanks!

– Dániel Grimm
Nov 21 '18 at 19:08

Sorry, I don’t know all the details either. Try to look at the FileManager methods startDownloadingUbiquitousItem(at:) and isUbiquitousItem(at:). Also try using the URLs directly instead of getting the path.

– Sven
Nov 21 '18 at 19:54

It is interesting, because if I would like to open a file which is not downloaded yet, just the placeholder icon is there, if I try this from a Document Picker, then it downloads first and then opens. But from outside the app, if I tap on it, it just opens immediately (of course, the file does not exist at that point, just its icon). I 've found already this startDownloadingUbiquitousItem before, but I don't understand why it hasn't got any callback? It just starts the download, but I don't know when it is finished. Thanks to your help, I really appreciate that.

– Dániel Grimm
Nov 21 '18 at 20:19

add a comment |

1

Try calling startAccessingSecurityScopedResource() on your URL first. (See developer.apple.com/documentation/foundation/nsurl/…)

– Sven
Nov 21 '18 at 18:02

This works if the file has already downloaded to the phone. So if there is a small cloud icon in the upright corner of the file this is not working, anyway I'm one step ahead than before, so thanks!

– Dániel Grimm
Nov 21 '18 at 19:08

Sorry, I don’t know all the details either. Try to look at the FileManager methods startDownloadingUbiquitousItem(at:) and isUbiquitousItem(at:). Also try using the URLs directly instead of getting the path.

– Sven
Nov 21 '18 at 19:54

It is interesting, because if I would like to open a file which is not downloaded yet, just the placeholder icon is there, if I try this from a Document Picker, then it downloads first and then opens. But from outside the app, if I tap on it, it just opens immediately (of course, the file does not exist at that point, just its icon). I 've found already this startDownloadingUbiquitousItem before, but I don't understand why it hasn't got any callback? It just starts the download, but I don't know when it is finished. Thanks to your help, I really appreciate that.

– Dániel Grimm
Nov 21 '18 at 20:19

Try calling startAccessingSecurityScopedResource() on your URL first. (See developer.apple.com/documentation/foundation/nsurl/…)

– Sven
Nov 21 '18 at 18:02

This works if the file has already downloaded to the phone. So if there is a small cloud icon in the upright corner of the file this is not working, anyway I'm one step ahead than before, so thanks!

– Dániel Grimm
Nov 21 '18 at 19:08

Sorry, I don’t know all the details either. Try to look at the FileManager methods startDownloadingUbiquitousItem(at:) and isUbiquitousItem(at:). Also try using the URLs directly instead of getting the path.

– Sven
Nov 21 '18 at 19:54

It is interesting, because if I would like to open a file which is not downloaded yet, just the placeholder icon is there, if I try this from a Document Picker, then it downloads first and then opens. But from outside the app, if I tap on it, it just opens immediately (of course, the file does not exist at that point, just its icon). I 've found already this startDownloadingUbiquitousItem before, but I don't understand why it hasn't got any callback? It just starts the download, but I don't know when it is finished. Thanks to your help, I really appreciate that.

– Dániel Grimm
Nov 21 '18 at 20:19

add a comment |

1 Answer
1

active

oldest

votes

It appears that the error can be many things, all not related to the class you are applying the code (AppDelegate) nor the methods you are calling.

~~My guess is that the URL you are calling is not correctly built (not pointing to the correct object you are trying to point to). For many reasons.~~

See if one of this reasons fix your issue:

(1) The end of the URL you are calling had the suffix "pgn". If you are looking to load a picture, maybe the suffix is wrong. In that case it could have been some known and supported format like "png", "jpeg" or "jpg".

~~(2) The "%20"symbol at the middle of your code also lifts a flag. Does not seem to be a correct URL object of swift. Maybe the URL you are using is not represented in the correct way.~~

(3) com~apple~CloudDocs also lifts a flag, since it would unlikely have a "~" symbol in a URL passed. This also strongly suggests that maybe the URL you are using is not represented in the correct way.

~~I think your URL is not pointing to where you are trying to point to, resulting in the "does exist" method return false and the loading resulting in nil.~~

If all of this does not fix your issue, post more details of the code. ~~Specially what method you are calling to build/create this URL object you are using, that points to: file:///private/var/mobile/Library/Mobile%20Documents/com~apple~CloudDocs/Desktop/twic1121.pgn~~

edited Nov 21 '18 at 22:51

answered Nov 21 '18 at 18:09

Luke Quinn

This URL is from the delegate method, that gets called when you open a file that has a registered file type with the application.

– Dániel Grimm
Nov 21 '18 at 19:10

The URL is not the problem. %20 is the correct way to encode spaces in an URL. And the com~apple~CloudDocs part is typical for URLs of files stored in iCloud. Also nobody said that it is supposed to be an image file - pgn is a common file format to store chess games.

– Sven
Nov 21 '18 at 19:50

add a comment |

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It appears that the error can be many things, all not related to the class you are applying the code (AppDelegate) nor the methods you are calling.

~~My guess is that the URL you are calling is not correctly built (not pointing to the correct object you are trying to point to). For many reasons.~~

See if one of this reasons fix your issue:

~~(2) The "%20"symbol at the middle of your code also lifts a flag. Does not seem to be a correct URL object of swift. Maybe the URL you are using is not represented in the correct way.~~

~~I think your URL is not pointing to where you are trying to point to, resulting in the "does exist" method return false and the loading resulting in nil.~~

edited Nov 21 '18 at 22:51

answered Nov 21 '18 at 18:09

Luke Quinn

This URL is from the delegate method, that gets called when you open a file that has a registered file type with the application.

– Dániel Grimm
Nov 21 '18 at 19:10

The URL is not the problem. %20 is the correct way to encode spaces in an URL. And the com~apple~CloudDocs part is typical for URLs of files stored in iCloud. Also nobody said that it is supposed to be an image file - pgn is a common file format to store chess games.

– Sven
Nov 21 '18 at 19:50

add a comment |

It appears that the error can be many things, all not related to the class you are applying the code (AppDelegate) nor the methods you are calling.

~~My guess is that the URL you are calling is not correctly built (not pointing to the correct object you are trying to point to). For many reasons.~~

See if one of this reasons fix your issue:

~~(2) The "%20"symbol at the middle of your code also lifts a flag. Does not seem to be a correct URL object of swift. Maybe the URL you are using is not represented in the correct way.~~

~~I think your URL is not pointing to where you are trying to point to, resulting in the "does exist" method return false and the loading resulting in nil.~~

edited Nov 21 '18 at 22:51

answered Nov 21 '18 at 18:09

Luke Quinn

This URL is from the delegate method, that gets called when you open a file that has a registered file type with the application.

– Dániel Grimm
Nov 21 '18 at 19:10

The URL is not the problem. %20 is the correct way to encode spaces in an URL. And the com~apple~CloudDocs part is typical for URLs of files stored in iCloud. Also nobody said that it is supposed to be an image file - pgn is a common file format to store chess games.

– Sven
Nov 21 '18 at 19:50

add a comment |

It appears that the error can be many things, all not related to the class you are applying the code (AppDelegate) nor the methods you are calling.

~~My guess is that the URL you are calling is not correctly built (not pointing to the correct object you are trying to point to). For many reasons.~~

See if one of this reasons fix your issue:

~~(2) The "%20"symbol at the middle of your code also lifts a flag. Does not seem to be a correct URL object of swift. Maybe the URL you are using is not represented in the correct way.~~

~~I think your URL is not pointing to where you are trying to point to, resulting in the "does exist" method return false and the loading resulting in nil.~~

edited Nov 21 '18 at 22:51

answered Nov 21 '18 at 18:09

Luke Quinn

It appears that the error can be many things, all not related to the class you are applying the code (AppDelegate) nor the methods you are calling.

~~My guess is that the URL you are calling is not correctly built (not pointing to the correct object you are trying to point to). For many reasons.~~

See if one of this reasons fix your issue:

~~(2) The "%20"symbol at the middle of your code also lifts a flag. Does not seem to be a correct URL object of swift. Maybe the URL you are using is not represented in the correct way.~~

~~I think your URL is not pointing to where you are trying to point to, resulting in the "does exist" method return false and the loading resulting in nil.~~

edited Nov 21 '18 at 22:51

answered Nov 21 '18 at 18:09

Luke Quinn

edited Nov 21 '18 at 22:51

answered Nov 21 '18 at 18:09

Luke Quinn

answered Nov 21 '18 at 18:09

Luke Quinn

answered Nov 21 '18 at 18:09

Luke Quinn

This URL is from the delegate method, that gets called when you open a file that has a registered file type with the application.

– Dániel Grimm
Nov 21 '18 at 19:10

The URL is not the problem. %20 is the correct way to encode spaces in an URL. And the com~apple~CloudDocs part is typical for URLs of files stored in iCloud. Also nobody said that it is supposed to be an image file - pgn is a common file format to store chess games.

– Sven
Nov 21 '18 at 19:50

add a comment |

This URL is from the delegate method, that gets called when you open a file that has a registered file type with the application.

– Dániel Grimm
Nov 21 '18 at 19:10

The URL is not the problem. %20 is the correct way to encode spaces in an URL. And the com~apple~CloudDocs part is typical for URLs of files stored in iCloud. Also nobody said that it is supposed to be an image file - pgn is a common file format to store chess games.

– Sven
Nov 21 '18 at 19:50

This URL is from the delegate method, that gets called when you open a file that has a registered file type with the application.

– Dániel Grimm
Nov 21 '18 at 19:10

The URL is not the problem. %20 is the correct way to encode spaces in an URL. And the com~apple~CloudDocs part is typical for URLs of files stored in iCloud. Also nobody said that it is supposed to be an image file - pgn is a common file format to store chess games.

– Sven
Nov 21 '18 at 19:50

add a comment |

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