Unrecognised selector error when adding UIImage to array - ios

Question

I am storing a UIImage in a NSDictionary, and then passing the NSDictionary at another place in the app. gridImages is a NSMutableArray
NSDictionary *pageDict = [pageArray objectAtIndex:0];
UIImage *pageImage = [pageDict objectForKey:#"image"];
[gridImages addObject:pageImage];
pagedict returns
{
class = is;
image = "<UIImage: 0x14e20e10>";
name = kaka;
page = 64;
}
which presumably I do
UIImage *pageImage = [pageDict objectForKey:#"image"];
However, when I try to add that UIImage to an array, I get this error:
-[UIImage stringByDeletingPathExtension]: unrecognized selector sent to instance 0x14e20e10
Any idea whats going on?
EDIT:
For the NSDictionary, I tried storing the UIImage as NSData:
NSData *imageData = UIImagePNGRepresentation(textbookImage);
[pageDict setObject:imageData forKey:#"image"];
[pageDict setObject:textbookName forKey:#"name"];
[pageDict setObject:page forKey:#"page"];
[pageDict setObject:nameOfClass forKey:#"class"];
And the parsing it like this:
NSData *imageData = [pageDict objectForKey:#"image"];
UIImage *pageImage = [UIImage imageWithData:imageData];
But it still returns the same error

Answer 1

You can't set UIImage into NSUserDefaults as UIImage is non-property-list object.
You better store path of image from documents directory.
This code will help.
// SET Image
NSString *strImagePath = //path of image from documents directory
NSMutableDictionary *dictOne = [NSMutableDictionary dictionaryWithCapacity:0];
[dictOne setObject:strImagePath forKey:#"image"];
[[NSUserDefaults standardUserDefaults] setObject:dictOne forKey:#"dict"];
// GET image
NSMutableDictionary *dict = [[NSUserDefaults standardUserDefaults] objectForKey:#"dict"];
UIImage *image = [UIImage imageWithContentsOfFile:[dict objectForKey#"image"]];
EDIT:
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *strImageFileName = [documentsDirectory stringByAppendingPathComponent:#"yourImageFileName"];
UIImage *image = // Your image;
NSData *dataImage = UIImageJPEGRepresentation(image, 0.5f);
/* Good image quality
NSData *dataImage = UIImagePNGRepresentation(image);
*/
[dataImage writeToFile:strImageFileName atomically:YES];
Happy coding.