NSMutableArray always return null - objective-c

Question

My problem is when I read content of plist file in an NSMutableArray always return null
NSString *resourceDocPath = [[NSString alloc] initWithString:[[NSBundle mainBundle]bundlePath]] ;
// Create the new dictionary that will be inserted into the plist.
NSMutableDictionary *nameDictionary = [NSMutableDictionary dictionary];
[nameDictionary setValue:#"walid" forKey:#"id"];
[nameDictionary setValue:#"555 W 1st St" forKey:#"lien"];
NSString *r = [NSString stringWithFormat:#"%#/download.plist", resourceDocPath];
NSLog(#"%#",r);
// Open the plist from the filesystem.
NSMutableArray *plist = [NSMutableArray arrayWithContentsOfFile:r];
NSLog(#"%#",plist);
if (plist == NULL)
{
plist = [NSMutableArray array];
}
[plist addObject:nameDictionary];
NSLog(#"%#",plist);
[plist writeToFile:r atomically:YES];
when I look in the plist file I found the data that I insert only one
can you help me please?

Answer 1

You're trying to access the application bundle rather than the documents directory, which can be accessed via NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *sourcePath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:#"Populator"];. The bundle cannot be modified, so the created array is never saved, hence why it is never loaded.

Answer 2

First you should not check for plist == null but check for plist == nil
Second searching for the download file should be changed into the following:
NSURL *url = [[NSBundle mainBundle] URLForResource:#"download" withExtension:#"plist"];
NSMutableArray *plist = [NSMutableArray arrayWithContentsOfURL:url];
Third:
I do not think a file with the extension of plist will return an Array.
It will probably represent an dictionary. Try creating an NSMutableDictionary instead of an array.