Question

In my app,

I have one array filterimage in that array some images is there.
I want that array data on another view.

I try to set nsuserdefault for filterimage with this code.

  NSUserDefaults *userPrefs = [NSUserDefaults standardUserDefaults];
  userPrefs setObject:filterimage forKey:@"FILTERIMAGE"];

with this code i try to get filterimage array data on another page.

FBImage = [[NSUserDefaults standardUserDefaults] valueForKey:@"FILTERIMAGE"]; 

FBImage is Array.

but get null in FBImage.

when i print data where i set user default it give like this.

-[NSUserDefaults setObject:forKey:]: Attempt to insert non-property value '(
    "<null>",
    "<null>",
    "http://external.ak.fbcdn.net/safe_image.php?d=AQD44bnA250GMrV2&w=90&h=90&url=http%3A%2F%2Fwww.djmag.com%2Fimages%2Ftop100djs%2F2011header.jpg",
    "http://external.ak.fbcdn.net/safe_image.php?d=AQD44bnA250GMrV2&w=90&h=90&url=http%3A%2F%2Fwww.djmag.com%2Fimages%2Ftop100djs%2F2011header.jpg",
    "http://external.ak.fbcdn.net/safe_image.php?d=AQD44bnA250GMrV2&w=90&h=90&url=http%3A%2F%2Fwww.djmag.com%2Fimages%2Ftop100djs%2F2011header.jpg",
    "<null>",
    "<null>",
    "<null>",
    "<null>",
    "<null>"
    )' of class '__NSArrayM'

is this problem because of i will get null value in filter array?

Answer 1

NSUserDefaults can only contain a few data types: BOOL, double, float, NSInteger, NSNumber, NSData, NSString, NSDate, NSArray, NSDictionary, NSURL. For other data types convert then to NSData or NSString.

Note that there are convince methods/functiions for many other data types to convert to and from NSStrings including NSStringFromCGAffineTransform, NSStringFromCGPoint, NSStringFromCGRect, NSStringFromCGSize, NSStringFromRange, NSStringFromUIEdgeInsets, NSStringFromUIOffset and their counterparts to recreate the data types from the NSString representations.