如何在文本文件的追加模式下编写 [英] how to write in append mode for text file

问题描述

我的应用程序导航基础。 UItextView用于备注UIViewController。我正在写文本数据到文件。现在我需要写下附加模式，下面的代码我正在尝试，但每次用相同的文本数据写入两次，并且如果下一个文本数据到文件则不附加。

My application navigation based. UItextView for notes UIViewController. I am writing data for text to file. Now i need to write in append mode , the below code i am trying but every time is writing to two time with same text data, and not appending if next text data to file.

- (void)saveText:(id)sender
{
    [self.textview resignFirstResponder];
    NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
    NSString *documentsDirectory = [documentPaths objectAtIndex:0];
    NSString *documentTXTPath = [documentsDirectory stringByAppendingPathComponent:@"Notes.txt"];
    NSString *savedString = textview.text;
    [savedString writeToFile:documentTXTPath atomically:YES];


    NSFileHandle *myHandle = [NSFileHandle fileHandleForUpdatingAtPath:documentTXTPath ];
    [myHandle seekToEndOfFile];
    [myHandle writeData:  [savedString dataUsingEncoding:NSUTF8StringEncoding]];
    [myHandle closeFile];

}

推荐答案

删除下面一行代码

[savedString writeToFile:documentTXTPath atomically:YES];

其余代码都很好。无论如何也检查我的代码，

And remaining code are all fine. Anyway check my code also,

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *documentTXTPath = [documentsDirectory stringByAppendingPathComponent:@"Notes.txt"];
    NSString *savedString = textview.text;
    NSFileHandle *myHandle = [NSFileHandle fileHandleForWritingAtPath:documentTXTPath];
    [myHandle seekToEndOfFile];
    [myHandle writeData:[savedString dataUsingEncoding:NSUTF8StringEncoding]];

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