I'm really confused right now. This is my piece of code:
NSFileManager *manager = [NSFileManager defaultManager];
NSURL *backup = [self applicationDocumentsDirectory];
backup = [backup URLByAppendingPathComponent:@"Old_Data_File"];
[manager createDirectoryAtURL:backup withIntermediateDirectories:YES attributes:nil error:nil];
When this code is executed, it crashes at the last line with the message
-[NSFileManager createDirectoryAtURL:withIntermediateDirectories:attributes:error:]: unrecognized selector sent to instance 0x5e59220
How could this be an unrecognized selector?
EDIT:
manager is not nil and printing backup to the console results in
{type = 15, string = file://localhost/Users/fabian/Library/Application%20Support/iPhone%20Simulator/4.3.2/Applications/D37C5B93-A778-4555-8953-814F823B1116/Documents/Old_Data_File, encoding = 134217984, base = (null)}
Until the Old_Data_File the path exists, the last component should be created by the file manager...
oh... are you targeting iOS 5.0 and newer? this API does not exist on iOS 4.3.