nsfilemanager

Storing images locally on an iOS device

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The simplest way is to save it in the app’s Documents directory and save the path with NSUserDefaults like so: NSData *imageData = UIImagePNGRepresentation(newImage); NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; NSString *imagePath =[documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@”%@.png”,@”cached”]]; NSLog(@”pre writing to file”); if (![imageData writeToFile:imagePath atomically:NO]) { NSLog(@”Failed to cache image data to … Read more

Is there a safer way to create a directory if it does not exist?

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You can actually skip the if, even though Apple’s docs say that the directory must not exist, that is only true if you are passing withIntermediateDirectories:NO That puts it down to one call. The next step is to capture any errors: NSError * error = nil; [[NSFileManager defaultManager] createDirectoryAtPath:bundlePath withIntermediateDirectories:YES attributes:nil error:&error]; if (error != … Read more

NSFileManager.defaultManager().fileExistsAtPath returns false instead of true

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(The code in this answer has been updated for Swift 3 and later.) Apparently your path variable is a NSURL (describing a file path). To get the path as a string, use the path property, not absoluteString: let exists = FileManager.default.fileExists(atPath: path.path) absoluteString returns the URL in a string format, including the file: scheme etc. … Read more

Delete files from directory inside Document directory?

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In case anyone needs this for the latest Swift / Xcode versions: here is an example to remove all files from the temp folder: Swift 2.x: func clearTempFolder() { let fileManager = NSFileManager.defaultManager() let tempFolderPath = NSTemporaryDirectory() do { let filePaths = try fileManager.contentsOfDirectoryAtPath(tempFolderPath) for filePath in filePaths { try fileManager.removeItemAtPath(tempFolderPath + filePath) } } … Read more

How to overwrite a file with NSFileManager when copying?

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If you can’t/don’t want to keep the file contents in memory but want an atomic rewrite as noted in the other suggestions, you can first copy the original file to a temp directory to a unique path (Apple’s documentation suggests using a temporary directory), then use NSFileManager’s -replaceItemAtURL:withItemAtURL:backupItemName:options:resultingItemURL:error: According to the reference documentation, this method … Read more

Finding file’s size

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Try this; NSDictionary *fileAttributes = [[NSFileManager defaultManager] attributesOfItemAtPath:URL error:&attributesError]; NSNumber *fileSizeNumber = [fileAttributes objectForKey:NSFileSize]; long long fileSize = [fileSizeNumber longLongValue]; Note that the fileSize won’t necessarily fit in an integer (especially a signed one) although you could certainly drop to a long for iOS as you’ll never exceed that in reality. The example uses long … Read more

How to create directory using Swift code (NSFileManager)

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Swift 5.0 let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true) let documentsDirectory = paths[0] let docURL = URL(string: documentsDirectory)! let dataPath = docURL.appendingPathComponent(“MyFolder”) if !FileManager.default.fileExists(atPath: dataPath.path) { do { try FileManager.default.createDirectory(atPath: dataPath.path, withIntermediateDirectories: true, attributes: nil) } catch { print(error.localizedDescription) } } Swift 4.0 let paths = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.documentDirectory, FileManager.SearchPathDomainMask.userDomainMask, true) let documentsDirectory: AnyObject = paths[0] as AnyObject … Read more

Testing file existence using NSURL

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NSURL does have this method: – (BOOL)checkResourceIsReachableAndReturnError:(NSError **)error Which “Returns whether the resource pointed to by a file URL can be reached.” NSURL *theURL = [NSURL fileURLWithPath:@”/Users/elisevanlooij/nonexistingfile.php” isDirectory:NO]; NSError *err; if ([theURL checkResourceIsReachableAndReturnError:&err] == NO) [[NSAlert alertWithError:err] runModal];

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