如何在iOS上以编程方式创建.txt文件

Question

我是一个新的iOS开发人员.我想创建一个应用程序,它将在应用程序的文件夹中自动创建新的*.txt文件.我只能找到如何打开,关闭,保存,写入和读取 - 而不是创建.如何创建新文件？谢谢.

Answer 1

使用以下代码在应用程序的Documents目录中编写/创建.txt文件.它应该是不言自明的.

NSError *error;
NSString *stringToWrite = @"1\n2\n3\n4";
NSString *filePath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject] stringByAppendingPathComponent:@"myfile.txt"];
[stringToWrite writeToFile:filePath atomically:YES encoding:NSUTF8StringEncoding error:&error];

并检索文本文件:

NSString *str = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:&error];
NSLog(@"%@", str);

Answer 2

我希望这可以帮助你

  -(void)writeToTextFile{

    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:@"%@/filename.txt", 
                                                  documentsDirectory];
    NSString *content = @"This is Demo";
    [content writeToFile:fileName 
                     atomically:NO 
                           encoding:NSStringEncodingConversionAllowLossy 
                                  error:nil];

   }

 -(void)ShowContentlist{

    NSArray *paths = NSSearchPathForDirectoriesInDomains
                    (NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *fileName = [NSString stringWithFormat:@"%@/filename.txt", 
                                                  documentsDirectory];
    NSString *content = [[NSString alloc] initWithContentsOfFile:fileName
                                                  usedEncoding:nil
                                                         error:nil];
    [content release];

 }