Finding path to plist in Xcode project folder

I have a plist in my Xcode project's resource folder but on physical drive it's in the top folder of my project. I want to read and write from this same file. Using NSBundle reads it properly and gives no problem. I'm using this code to read file path:

NSString *thePath = [[NSBundle mainBundle]  pathForResource:@"MyFile" ofType:@"plist"];

but i think NSBundle doesn't allow writing back and so it didn't work when i tried to write back the file. Using the following code creates/ updates file using application path

NSArray *pathArray = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDirectory, YES);
NSString * docsDirectory = [pathArray objectAtIndex:0];
NSString *filePath = [docsDirectory stringByAppendingPathComponent:@"MyFil开发者_运维问答e.plist"];

but for now, I need to write on internal file. Any solution to access it? Besides, I've tried giving path from my working directory to project directory. It also doesn't work.

It's not NSBundle that doesn't support writing, it's iOS itself. iOS will not let your app write to its own bundle.