在iphone上逐行写数据

Question

我可以在iphone上写一个文本文件..但每次我写的我的前一个值都被删除了,有没有办法继续写数据\n？

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像1然后2

Answer 1

使用NSFileHandle方法seekToEndOfFile和调用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