[英]how to write in append mode for text file
My application navigation based. 我的应用导航基础。 UItextView for notes UIViewController. UItextView用于注释UIViewController。 I am writing data for text to file. 我正在写文本数据到文件。 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. 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,如果下一个文本数据到文件则不附加。
- (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];
}
Remove the following line of code 删除以下代码行
[savedString writeToFile:documentTXTPath atomically:YES];
And remaining code are all fine. 剩下的代码都很好。 Anyway check my code also, 无论如何也检查我的代码,
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]];
Try this it works great 试试这个很棒
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *documentTXTPath = [documentsDirectory stringByAppendingPathComponent:@"Notes.txt"];
NSString *savedString = textview.text;
If file Does not exist create it and write to file or else its already created append to end of the file 如果文件不存在,则创建它并写入文件,否则其已创建的附加到文件末尾
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]];
}
You can also do 你也可以
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];
And again write contents to particular file path 并再次将内容写入特定文件路径
[content writeToFile:documentTXTPath atomically:YES encoding:NSUTF8StringEncoding error:nil];
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