iphone - 在iphone上逐行写入数据

Question

我可以写入iPhone上的文本文件..但是每次我写入之前的值都会被删除，有什么方法可以继续写入用\n分隔的数据吗？

这是我的代码

NSString *cc=@"1";

    [cc writeToFile:storePath atomically:YES];

    NSString *myText1 = [NSString stringWithContentsOfFile:storePath];

    NSLog(@"text is %@",myText1);

这给了我 1 现在我想添加 2 就像 1 然后 2

Answer 1

使用NSFileHandle方法seekToEndOfFile并调用writeData

NSFileHandle *aFileHandle;
NSString *aFile;

aFile = [NSString stringWithString:@"Your File Path"]; //setting the file to write to

aFileHandle = [NSFileHandle fileHandleForWritingAtPath:aFile]; //telling aFilehandle what file write to
[aFileHandle truncateFileAtOffset:[aFileHandle seekToEndOfFile]]; //setting aFileHandle to write at the end of the file

[aFileHandle writeData:[toBeWritten dataUsingEncoding:nil]]; //actually write the data