behaving NSUserDefaults as a two plist File? - iphone

Question

In UserDefault file I have six fields. I want to persist two field always and reset four other field in some scenario. What is best approach to handle this?

Answer 1

If your want the four field to reset with their default values.
And the default value may be an empty string ,
#define KDefault #""
NSUserDefaults *standardUserDefaults = [NSUserDefaults standardUserDefaults];
if (standardUserDefaults)
{
[standardUserDefaults setObject:KDefault forKey:#"first"];
[standardUserDefaults setObject:KDefault forKey:#"two"];
[standardUserDefaults setObject:KDefault forKey:#"third"];
[standardUserDefaults setObject:KDefault forKey:#"four"];
[standardUserDefaults synchronize];
}
Edited:
For removing field rather than resetting: Use the below
[standardUserDefaults removeObjectForKey:#"first"];
[standardUserDefaults removeObjectForKey:#"two"];
[standardUserDefaults removeObjectForKey:#"third"];
[standardUserDefaults removeObjectForKey:#"four"];
[standardUserDefaults synchronize];

Answer 2

.you can use NSFileManager..sample code
NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); //1
NSString *documentsDirectory = [paths objectAtIndex:0]; //2
NSString *path = [documentsDirectory stringByAppendingPathComponent:#"user.plist"]; //3
NSFileManager *fileManager = [NSFileManager defaultManager];
if (![fileManager fileExistsAtPath: path]) //4
{
NSString *bundle = [[NSBundle mainBundle] pathForResource:#"user" ofType:#"plist"]; //5
[fileManager copyItemAtPath:bundle toPath: path error:&error]; //6
}
NSMutableDictionary *savedStock = [[NSMutableDictionary alloc] initWithContentsOfFile: path];
//load from savedStock example int value
NSString* userName;
NSString* password;
NSString* pin;
userName = [savedStock objectForKey:#"name"];
password = [savedStock objectForKey:#"password"];
if([userName isEqualToString:#"some"] && [userName isEqualToString:#"some"] && [pin isEqualToString:#"some"])
{
[self setAdd];
}
else
{
[self pinAdd];
}