NSMutableDictionary data not saving in file for wrong file directory - ios

Question

I have two UITextField
email
password
These two field values are stored in a NSMutableDictionary call userData. Now i want to save these two field values in a file, so that the records keep there and i can restore this record to check user login correctly. Here i want to accomplish that, but not working.
My code :
-(void) saveRegistrationData
{
userData = [[NSMutableDictionary alloc]
initWithObjects:[[NSMutableArray alloc] initWithObjects:#"123456", nil]
forKeys:[[NSMutableArray alloc] initWithObjects:#"admin#gmail.com", nil]];
[userData setObject:passwordTextField.text forKey:emailTextField.text];
NSString *savePath = [#"/MediaFiles/Documents/" stringByExpandingTildeInPath];
[userData writeToFile: savePath atomically: YES];
//[userData writeToFile:#"MediaFiles/Documents/" atomically:YES];
for (id key in userData)
{
NSLog(#"%# is for %#", key, [userData objectForKey:key]);
}
}
I think the path is not setting correctly. If any one similar with the solution, please share with me. Thanks in advanced. Have a good day.

Answer 1

It's not working for a few reasons.
1) You're writing to a folder in the root of the device's filesystem. Apple uses sandboxing to prevent this from happening as you could overwrite and modify any system files.
2) You're writing to a folder rather than a file. To write to a file, you need to specify a filename (and extension). i.e. "/MediaFiles/Documents/dnt_lk_at_dis.plist"
In order to fix these issues, you need to be firstly getting the path to the sandbox (documents directory) and then append the filepath.
NSString *docsPath = [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *filename = #"secret.plist";
NSString *filePath = [docsPath stringByAppendingPathComponent:filename];
Furthermore, I strongly suggest that you instead use the keychain for storing sensitive user information. Anybody with a jailbroken device, or anybody that has access to the file system will be able to extract the user's information if it is stored in plain-text. At the very least, please encrypt the password before writing it to disk.

Answer 2

-(void) saveRegistrationData
{
userData = [[NSMutableDictionary alloc] init];
[userData setObject:passwordTextField.text forKey:#"password"];
[userData setObject:emailTextField.text forKey:#"email"];
// Alternative to the above:
userData = [[NSMutableDictionary alloc]
initWithObjects:[[NSMutableArray alloc] initWithObjects:passwordTextField.text, emailTextField.text, nil]
forKeys:[[NSMutableArray alloc] initWithObjects:#"password", #"email" nil]];
NSString *savePath = [#"/MediaFiles/Documents/myDict.plist" stringByExpandingTildeInPath]; // write to a file, not a dictionary
[userData writeToFile: savePath atomically: YES];
for (id key in userData)
{
NSLog(#"%# is for %#", key, [userData objectForKey:key]); // now you should see the result that you want to.
}
// Alternative for the above - the lazy way of doing it:
NSLog (#"theDictionary: %#", userData);
}
Please forgive me any typos or so. I did not compile it for you :-)