从Web服务器更新支持文件

Question

I am writing an IPhone application in witch I downloaded files and photos locally in the Supporting Files folder ( in the right panel of xcode ), these files are downloaded also in a web server, what I want is that if the application detect that these files are updated in the web server , it replace them with the new content in the Supporting Files I used

NSArray* pathArray = NSSearchPathForDirectoriesInDomains(NSApplicationSupportDirectory,NSUserDomainMask, YES);  
documentsDirectory = [pathArray objectAtIndex:0];
NSString* localFile = [documentsDirectory stringByAppendingPathComponent:@"test.txt"];
[data writeToFile:localFile options:NSDataWritingAtomic  error:&error];

the code works well but the problem is that it replaces content of files in
Library/Application Support folder and not the Supporting Files so when I do :

NSBundle *thisBundle = [NSBundle mainBundle];
NSString *TextURL = [thisBundle pathForResource:@"test" ofType:@"txt"];
NSURL *instructionsURL = [NSURL fileURLWithPath:TextURL];
NSString *TextString = [NSString stringWithContentsOfURL:instructionsURL];
mayText.text = TextString;  

the old content is displayed and not the updated one How can I change my code to replace files in Supporting files directory every time Application Support files are changed ? And what is the difference between these two folders? Thank you.

Answer 1

You can't. iOS Apps on the device are signed, changing the bundle's content would break that signing. And as all files that are managed by Xcode and added to a target go to the bundle, they must not be changed.

Instead download the files to a sandbox directory, such as Documents and access it there.

Also note that Supporting Files iin Xcode is not a directory but a group. It juste groups it content inside the Xcode project but does not organize the files in a directory on file system level.