将文本文件保存到iOS 7中的文档目录

我想保存一个纯文本文件到iOS 7中的文档目录。这是我的代码：

//Saving file NSFileManager *fileManager = [[NSFileManager alloc] init]; NSArray *urls = [fileManager URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask]; NSString *url = [NSString stringWithFormat:@"%@", urls[0]]; NSString *someText = @"Random Text To Be Saved"; NSString *destination = [url stringByAppendingPathComponent:@"File.txt"]; NSError *error = nil; BOOL succeeded = [someText writeToFile:destination atomically:YES encoding:NSUTF8StringEncoding error:&error]; if (succeeded) { NSLog(@"Success at: %@",destination); } else { NSLog(@"Failed to store. Error: %@",error); } 

这是我得到的错误：

 2013-10-13 16:09:13.848 SavingFileTest[13675:a0b] Failed to store. Error: Error Domain=NSCocoaErrorDomain Code=4 "The operation couldn't be completed. (Cocoa error 4.)" UserInfo=0x1090895f0 {NSFilePath=file:/Users/Username/Library/Application%20Support/iPhone%20Simulator/7.0-64/Applications/F5DA3E33-80F7-439B-A9AF-E8C7FC4E1630/Documents/File.txt, NSUserStringVariant=Folder, NSUnderlyingError=0x10902aeb0 "The operation couldn't be completed. No such file or directory"} 

我无法弄清楚为什么我得到这个错误在模拟器上运行。 这个如果我使用NSTemporaryDirectory（）。

Answer 1

从苹果的Xcode模板：

 /** Returns the URL to the application's Documents directory. */ - (NSURL *)applicationDocumentsDirectory { return [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject]; } 

你可以这样保存：

 NSString *path = [[self applicationDocumentsDirectory].path stringByAppendingPathComponent:@"fileName.txt"]; [sampleText writeToFile:path atomically:YES encoding:NSUTF8StringEncoding error:nil]; 

Answer 2

孟迪在斯威夫特的回答：

  let fileName = "/File Name.txt" let filePath = self.applicationDocumentsDirectory().path?.stringByAppendingString(fileName) do { try strFileContents.writeToFile(filePath!, atomically: true, encoding: NSUTF8StringEncoding) print(filePath) } catch { // error saving file } func applicationDocumentsDirectory() -> NSURL { return NSFileManager.defaultManager().URLsForDirectory(NSSearchPathDirectory.DocumentDirectory, inDomains: NSSearchPathDomainMask.UserDomainMask).last! } 

Answer 3

  -(void)writeATEndOfFile:(NSString *)content2 { NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; //make a file name to write the data to using the documents directory: NSString *fileName = [NSString stringWithFormat:@"%@/textfile.txt", documentsDirectory]; if([[NSFileManager defaultManager] fileExistsAtPath:fileName]) { NSFileHandle *fileHandle = [NSFileHandle fileHandleForWritingAtPath:fileName]; [fileHandle seekToEndOfFile]; NSString *writedStr = [[NSString alloc]initWithContentsOfFile:fileName encoding:NSUTF8StringEncoding error:nil]; content2 = [content2 stringByAppendingString:@"\n"]; writedStr = [writedStr stringByAppendingString:content2]; [writedStr writeToFile:fileName atomically:NO encoding:NSStringEncodingConversionAllowLossy error:nil]; } else { int n = [content2 intValue]; [self writeToTextFile:n]; } } -(void) writeToTextFile:(int) value{ //get the documents directory: NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; //make a file name to write the data to using the documents directory: NSString *fileName = [NSString stringWithFormat:@"%@/textfile.txt", documentsDirectory]; //create content - four lines of text // NSString *content = @"One\nTwo\nThree\nFour\nFive"; NSString *content2 = [NSString stringWithFormat:@"%d",value]; content = [content2 stringByAppendingString:@"\n"]; //save content to the documents directory [content writeToFile:fileName atomically:NO encoding:NSStringEncodingConversionAllowLossy error:nil]; }