如何在iOS，模拟器和设备上读/写文件？ [英] How to read/write file with iOS, in simulator as well as on device?

问题描述

因为我需要在我的应用程序启动时读取文件并在使用它时有时写入，我试图通过以下方式来访问它：

As I need to read a file when my app is launched and write it sometimes while using it, I tried to reach it with :

NSString *dataFile = [[NSBundle mainBundle] pathForResource:@"data" ofType:@"txt"];
NSLog(@"%@",dataFile);

该文件应该在我的项目文件夹中，而是在模拟器文件夹中：

And the file, that should be in my project folder, is instead in the simulator folder :

2012-06-13 17：36：56.398 MyFileApp [610：15203] / Users / Rob / Library / Application Support / iPhone Simulator / 5.1 /Applications/1FFD4436-DCCA-4280-9E47-F6474BEE0183/MyFileApp.app/myFile.txt

2012-06-13 17:36:56.398 MyFileApp[610:15203] /Users/Rob/Library/Application Support/iPhone Simulator/5.1/Applications/1FFD4436-DCCA-4280-9E47-F6474BEE0183/MyFileApp.app/myFile.txt

所以，如果我想阅读/使用模拟器和真实设备写它，我该怎么办？

So if I want to read/write it in using the simulator as well as the real device, what should I do ?

感谢您的建议

推荐答案

要从捆绑包中读取文件，请执行以下操作

To read the file from the bundle do the following

NSString *dataFile = [[NSBundle mainBundle] pathForResource:@"data" ofType:@"txt"];

从沙盒存储中读取（文档）

To read it from your sandbox storage (documents)

NSString *docPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/YourFile.txt"];
NSString *dataFile = [NSString stringWithContentsOfFile:docPath 
                                           usedEncoding:NSUTF8StringEncoding 
                                                  error:NULL];

写入文件夹

NSString *docPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/YourFile.txt"];
[dataFile writeToFile:docPath 
          atomically:YES 
            encoding:NSUTF8StringEncoding 
               error:NULL];

请注意，您将无法在应用程序的软件包文件夹中写入该文件

Please note you will not be able to write the file in the bundle folder of your application

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