将NSString写入文件 [英] write NSString to file

问题描述

我正在尝试将字符串写入文件，并将其存储在应用程序的applicationSupport文件夹中.但是我的NSLog()语句没有在调试器中记录任何内容.我已经尝试过使用调试器进行调试，我可以看到内容为nil，所以我猜测这就是为什么它不输出任何内容的原因，但是我不知道为什么将其设置为nil.有人可以看到我的错误吗?

I'm trying to write a string to a file and store that in the applicationSupport folder within my app. But my NSLog() statement doesn't log anything in the debugger. I have tried to go through it with the debugger, and i can see that the content is nil, so i'm guessing that's why it's not outputting anything, but i don't know why it's set to nil. Can anybody see my mistake?

 NSString *document = [[[[[[[[description stringByAppendingString:@" "]stringByAppendingString:focus]stringByAppendingString:@" "]stringByAppendingString:level]stringByAppendingString:@" "]stringByAppendingString:equipment]stringByAppendingString:@" "]stringByAppendingString:waterDepth];
//NSLog(@"%@", document);

//get the documents directory:
NSArray *paths = NSSearchPathForDirectoriesInDomains
(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *supportDirectory = [paths objectAtIndex:0];

//filename
NSString *filename = [NSString stringWithFormat:[_nameTextField.text stringByAppendingString:@".txt"], supportDirectory];

[document writeToFile:filename atomically:NO encoding:NSStringEncodingConversionAllowLossy error:nil];

NSString *content = [[NSString alloc]initWithContentsOfFile:filename usedEncoding:nil error:nil];
NSLog(@"%@", content);

推荐答案

文件名错误.它应具有以下格式:"directory/file.extension" .您可以使用方法

filename is wrong. It should have the following format: "directory/file.extension". You can use the methods stringByAppendingPathComponent and stringByAppendingPathExtension to construct such a string.

NSString *filename = [supportDirectory stringByAppendingPathComponent:[_nameTextField.text stringByAppendingPathExtension:@"txt"]];

---

此外，请注意，第一行应使用 stringWithFormat 重写，如下所示:

NSString *document = [NSString stringWithFormat:@"%@ %@ %@ %@ %@", description, focus, level, equipment, waterDepth];

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