如何在文本文件的追加模式下编写
如何在文本文件的追加模式下编写
提问于 2011-01-24 16:12:56
我的应用程序基于导航。notes UIViewController的UItextView。我正在将文本数据写入文件。现在我需要在附加模式下编写，下面的代码我正在尝试，但每次都是用相同的文本数据写入两次，而不是将下一个文本数据附加到文件中。
- (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];
}回答 3
Stack Overflow用户
回答已采纳
发布于 2011-01-24 16:19:40
删除以下代码行
[savedString writeToFile:documentTXTPath atomically:YES];和其余的代码都很好。无论如何，也要检查我的代码，
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]];Stack Overflow用户
发布于 2013-03-07 14:05:26
试试这个，效果很好。
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *documentTXTPath = [documentsDirectory stringByAppendingPathComponent:@"Notes.txt"];
NSString *savedString = textview.text;如果文件不存在，则创建该文件并写入文件或将其已创建的文件追加到文件的末尾
NSFileManager *fileManager = [NSFileManager defaultManager];
if(![fileManager fileExistsAtPath:documentTXTPath])
{
[savedString writeToFile:documentTXTPath atomically:YES];
}
else
{
NSFileHandle *myHandle = [NSFileHandle fileHandleForWritingAtPath:documentTXTPath];
[myHandle seekToEndOfFile];
[myHandle writeData:[savedString dataUsingEncoding:NSUTF8StringEncoding]];
}Stack Overflow用户
发布于 2014-11-19 19:07:04
你也可以这样做
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *documentTXTPath = [documentsDirectory stringByAppendingPathComponent:@"Notes.text"];
NSString *content = [NSString stringWithContentsOfFile:documentTXTPath encoding:NSUTF8StringEncoding error:nil];
content = [content stringByAppendingString:data];并再次将内容写入特定的文件路径
[content writeToFile:documentTXTPath atomically:YES encoding:NSUTF8StringEncoding error:nil];页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/4779877
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