nsfilemanager

问题 I'm trying to create an array of NSStrings of the contents of a folder that I've dragged into my project... but when I count the items in the array afterwards, it's always comes back with 0; So, my folder in my project looks like this -Cards -Colors Blue.png Green.png Orange.png Yellow.png Purple.png Black.png And my code which tries to get this list of files (the color pngs) is NSError *error = nil; NSString *pathString = [[NSString alloc] init]; pathString = [[NSString alloc] initWithString

问题 Is there a way to tell the -[NSFileManager contentsOfDirectoryAtURL:includingPropertiesForKeys:options:error:] method to exclude directory names when gathering the contents of a directory? I have a tree view showing folders and want to show ONLY files in the table view, but I can't seem to find a key or any other way to exclude folders. I suppose I could iterate the returned array to stuff only files into a second array, which will be used as the data source, but this double-handling seems a

问题 I am creating files with the following code NSString *docPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"]; NSString *filename = @"xyz123.data"; docPath = [NSString stringWithFormat:@"%@/%@", docPath, filename]; NSError *error = nil; [data writeToFile:docPath options:0 error:&error]; To delete files I use the following NSFileManager *manager = [NSFileManager defaultManager]; NSError *error = nil; NSString *path = @"xyz123.data"; //NSString *path = @"Documents/xyz123.data"

问题 I have a FileHelper class where I've implemented 3 methods whose job is to write a Dictionary contents to a file. Those methods are: func storeDictionary(_ dictionary: Dictionary<String, String>, inFile fileName: String, atDirectory directory: String) -> Bool { let ext = "txt" let filePath = createFile(fileName, withExtension: ext, atDirectory: directory) /**** //If I use this method, file is created and dictionary is saved guard (dictionary as NSDictionary).write(to: filePath!, atomically:

问题 I am trying to copy a folder in my NSBundle which contains quite a number of images. I tried doing it with these codes. NSFileManager *fileManager = [NSFileManager defaultManager]; NSError *error; NSArray *paths = NSSearchPathForDirectoriesInDomains( NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; NSString *documentDBFolderPath = [documentsDirectory stringByAppendingPathComponent:@"Images"]; NSString *resourceDBFolderPath = [[[NSBundle

问题 Using the line below, [fileManager copyItemAtPath:sourcePath toPath:targetPath error:&error]; We can copy a folder but if the folder already exists it throws an exception "File Exists". In order to overwrite a single file, we can achieve it through the following lines: NSData *myData = [NSData dataWithContentsOfURL:FileURL]; /fetch single file [myData writeToFile:targetPath atomically:YES]; But I want to copy an already existing folder i.e, overwrite . Edit : Simple Possibility , I can remove

问题 I have created a folder within the Documents folder in my application directory . I wanted to rename that folder through code,but not able to understand how to do it. Please help me out. 回答1: NSString *oldDirectoryPath = @"Type your old directory Path"; NSArray *tempArrayForContentsOfDirectory =[[NSFileManager defaultManager] contentsOfDirectoryAtPath:oldDirectoryPath error:nil]; NSString *newDirectoryPath = [[oldDirectoryPath stringByDeletingLastPathComponent]stringByAppendingPathComponent

问题 I know that the file exists, because I can download it, but I need to check to see whether it exists. I have tried using [NSFileManager contentsOfDirectoryAtPath:error:] but it gives me null. I don't understand why that is because I can still download the files that I'm looking for. Maybe it's an incorrect URL, but the URL that I'm using is the one that I printed at creation of my UIDocument that I'm looking for. Maybe I'm using the wrong method? EDIT: I have also tried using NSMetadataQuery,

问题 I saw a WWDC 2010 video about NSFileProtectionComplete and protecting app's data. Are there any examples out there? Does any one have sample code to share? 回答1: See the NSFileManager class doc: The file is stored in an encrypted format on disk and cannot be read from or written to while the device is locked or booting. It's basically file vault for individual files. You just pass the constant when you set the file attributes. To mark a file as protected, you must add an extended attribute to

问题 I saw a WWDC 2010 video about NSFileProtectionComplete and protecting app's data. Are there any examples out there? Does any one have sample code to share? 回答1: See the NSFileManager class doc: The file is stored in an encrypted format on disk and cannot be read from or written to while the device is locked or booting. It's basically file vault for individual files. You just pass the constant when you set the file attributes. To mark a file as protected, you must add an extended attribute to