I am working on widget app. I am totally new to Today Extension. I want to share data between app and today extension. I have created one database. I have 4 tables in that database. I found this code to create database for App Groups :
NSString *appGroupId = #"group.appname";
NSURL *appGroupDirectoryPath = [[NSFileManager defaultManager] containerURLForSecurityApplicationGroupIdentifier:appGroupId];
dataBaseURL = [appGroupDirectoryPath URLByAppendingPathComponent:#"database.sqlite"];
NSLog(#"dataBaseURL %#", dataBaseURL);
It worked. My SQLite file has been created. But It does't show my tables. It shows empty database. I don't have any idea about it. Please help.
If you are creating new database then it will obviously empty.
first thing you can create data base with tables in objective c. there is no need to create database from outside the xcode and drag and drop yto xcode. you can refer this techotopia tutorial for that.
Now if you put database in your main bundle by drag and drop then you can access that like,
NSString *databasePath = [[NSBundle mainBundle] pathForResource:#"myDbName" ofType:#"sqlite"];
by this way you can get your database path. here pathforresource is your database name, i think database in your case and oftype is extention, i think sqlite in your case.
now you get path as string if you want it in url then you can convert it in url like,
NSURL *fileURL = [[NSURL alloc] initFileURLWithPath:filePath];
or
NSURL *fileURL = [NSURL fileURLWithPath:filePath];
Hope this will help :)
Related
Here is the NSURL object that I am using for creating and accessing important configuration file on iOS with features:
hidden from user
not user generated file (storing configuration related to user)
not temp or cache (not possible to create later with existing data)
must be backed up by iCloud/iTunes
[NSURL fileURLWithPath:[[NSSearchPathForDirectoriesInDomains(
NSLibraryDirectory,
NSUserDomainMask,
YES) objectAtIndex:0]
stringByAppendingString:#"/important.txt"]];
As suggested in FileSystemOverview (developer.apple.com), I am storing this file under Library.
Maybe better way is storing it under Library/Application Support.
Using NSSearchPathForDirectoriesInDomains, which takes:
enum NSSearchPathDirectory
NSApplicationDirectory
NSDeveloperApplicationDirectory
NSLibraryDirectory
NSDeveloperDirectory
NSApplicationSupportDirectory
...
enum NSSearchPathDomainMask
NSUserDomainMask
NSLocalDomainMask
NSSystemDomainMask
...
BOOL expandTilde
Is this the correct way of storing such a file?
There are couple of alternatives for NSSearchPathDirectory and NSSearchPathDomainMask.
Also what about the expandTilde, on iOS is it necessary?
Is there a better way of doing it, instead of creating path as a NSString using objectAtIndex and appending file name then converting it to NSURL?
Thanks.
Using NSApplicationSupportDirectory would be my first choice for this.
But keep a few things in mind:
Unlike the "Documents" folder, the "Library/Application Support" folder doesn't exist in an iOS app sandbox by default so you must create the folder before trying to use it.
"Hidden from the user" only means that the user won't see it under normal circumstances. But the file is easily accessible by anyone with any technical knowledge.
You do want to pass YES for the expandTilde parameter so your app returns a proper path when you run the app in the simulator. On a real iOS device, it makes little difference.
Do not use stringByAppendingString: to create paths. Use stringByAppendingPathComponent:.
NSString *appSupportPath = [NSSearchPathForDirectoriesInDomains(NSApplicationSupportDirectory, NSUserDomainMask, YES) firstObject];
NSString *filePath = [appSupportPath stringByAppendingPathComponent:#"important.txt"];
NSURL *fileURL = [NSURL fileURLWithPath:filePath];
You can get a direct NSURL using NSFileManager:
NSURL *appSupportURL = [[[NSFileManager defaultManager] URLsForDirectory:NSApplicationSupportDirectory inDomains:NSUserDomainMask] firstObject];
NSURL *fileURL = [appSupportURL URLByAppendingPathComponent:#"important.txt"];
I´m testing Apple Watch OS 2 and I´m trying to send a image from the application to the watch. According to Apple, I shall use WCSession transferFile to do this.
Use the transferFile:metadata: method to transfer files in the background. Use this method in cases where you want to send more than a simple dictionary of values. For example, use this method to send images or file-based documents.
for example:
NSString *string = [[NSBundle mainBundle] pathForResource:#"my_image" ofType:#"png"];
NSURL *path = [NSURL URLWithString:string];
[[WCSession defaultSession] transferFile:path metadata:#{#"meta1":#"meta2"}];
It all looks ok in the debugger, the path is correct and the file is accessible (checked with NSFileManager) and readable.
However, everytime I try I get a callback to the didFinishFileTransfer function, including an error:
Error Domain=WCErrorDomain Code=7013 "The operation couldn’t be completed. (WCErrorDomain error 7013.)"
Looking up the error:
WCErrorCodeFileAccessDenied
An error indicating that a file could not be transferred because it was inaccessible.
Available in watchOS 2.0 and later.
It seems the file is not accessible by the send function? I have tried things like resaving the file to another directory etc, but nothing seems to work.
Anyone got an idea?
The URL you are creating is not a fileURL. Try:
NSURL *path = [NSURL fileURLWithPath:string];
I managed to solve the issue!
It was because my path did not start with file://
The following code worked just fine:
NSString *string = [[NSBundle mainBundle] pathForResource:#"my_image" ofType:#"png"];
string = [NSString stringWithFormat:#"file://%#", string];
NSURL *path = [NSURL URLWithString:string];
[[WCSession defaultSession] transferFile:path metadata:#{#"meta1":#"meta2"}];
So it´s quite picky regarding the path.
I have to share my OS X app, all the paths I have used for files used by project are linked to my username and the structure of my computer.
Is there a way to have paths related to my project so that once my project is shared the user may not get in troubles caused by 'file not found'.
I would move the used files of the project, into the project but then I don't know how to let this happen:
actual paths, what I use now:
/Users/???username???/XCode/projectName/fileName.txt
what I would like to use in my code:
function(path: fileName.txt)
how don't know how to make the paths this short, not caring about the users directories since the files I'm going to use are all inside my project.
I am very confused. Thank you.
There is actually an easy way to read files from your project directory:
NSError *error = nil;
NSString *filePath = [[NSBundle mainBundle] pathForResource:#"filename" ofType:#"txt"];
NSString *dataContent = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:&error];
So in dataContent you have the content of the file as an NSString instance.
I am trying to update my app for WatchKit and I save a NSKeyedArchiver file to the NSDocumentsDirectory normally.
With updating to app groups I need to store it in the app groups folder. The issue I am having is I cant figure out how to just get the path, and not have it referenced as a file I am looking for.
The way it is set up now is to find the file it gives the path as a NSString
/Users/ME/Library/Developer/CoreSimulator/Devices/43F/data/Containers/Data/Application/5E/Documents/fav
but when I store to app groups, no matter which way I access the folder, it is returned
file:///Users/ME/Library/Developer/CoreSimulator/Devices/43F/data/Containers/Data/Application/5E/Documents/fav
What is the best way to just obtain the path to the shared group, rather than have the app looking for the direct file?
So coffee deprived me had forgotten about the .path for filemanager.
NSURL *fileManagerURL = [[NSFileManager defaultManager] containerURLForSecurityApplicationGroupIdentifier:#"group.com"];
NSString *tmpPath = [NSString stringWithFormat:#"%#", fileManagerURL.path];
NSString *finalPath = [NSString stringWithFormat:#"%#",[string stringByAppendingString:#"/Favourites2"]];
I was running into the same problem. I was going through the whole process of building a string to my save location and now I'm switching over to app groups and using the
NSURL *fileManagerURL = [[NSFileManager defaultManager] containerURLForSecurityApplicationGroupIdentifier:groupID];
Well, the problem is, now instead of a string to the location that starts with "/Users/yourname/Library..." you get "file:///Users/yourname/Library..."
Here's what I did. I created the NSURL. Then I called absoluteString on it.
NSURL groupPath = [[fileManager containerURLForSecurityApplicationGroupIdentifier:groupID] absoluteString];
I now have a string that I need to strip off the first 7 characters of, then my old code works just fine, except now instead of being in the Documents directory, it's in a shared app group that can be accessed by both my old code and my new watchkit extension.
Here's the code to strip off the first 7 characters (index 6 since you start with 0), you should be able to use either method...
NSString *newGroupPath = [groupPath substringFromIndex:6];
or
NSString *newGroupPath = [groupPath substringWithRange:NSMakeRange(6, [str length]-6)];
This just removes the "file://" from the absoluteString that was made from the NSURL and gives you back your older string path the starts "/Users/YourName/Library/Developer/yada yada yada"
Hope that helps you, I have spent 4 hours figuring it out.
It seems to work for me on the simulator, I haven't tried it on the Watch yet. But at least my app is now working the way it was before, just saving the data in a shared app group. (I have a singleton that manages all of my data throughout my app, and I want that same singleton to provide data to my watch app).
Is there a way by which I can directly use mbtiles database with MKTileOverlay without using a third party framework like MapBox or any other?
Right now, I have the tiles stored in a folder structure and the code I am using is below:
NSString *tileDirectory = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:#"Tiles"];
NSString *tileDirectoryURL = [NSURL fileURLWithPath:tileDirectory isDirectory:YES];
NSString *tileURL = [NSString stringWithFormat:#"%#Z{z}/{y}_{x}.png", tileDirectoryURL];
tileOverlay = [[MKTileOverlay alloc] initWithURLTemplate:tileURL];
[tileOverlay setGeometryFlipped:YES];
[mainMapView addOverlay:tileOverlay];
But now I want to have a tiles.mbtiles sqlite database instead of the files in folders.
Please suggest me how can I do this. How do I initialize the MKTileOverlay object if I choose to use sqlite database. How will I put {x},{y},{z}.
I went through the documentation of MKTileOverlay and found that :
- (void)loadTileAtPath:(MKTileOverlayPath)path result:(void (^)(NSData *tileData, NSError *error))result
can be used but I am not able to understand how can I use it? If any one can please give ma a short example then it would be very helpful.
You could take a look at how this project does it…
https://github.com/t2wu/OSMMapKit
It doesn't seem to be finished yet but it should get you on the right path.