IPhone: how can I store UIImage using NSUserDefaults?

Question

I can not save the image using nsuserdefaults and crashed my application, and also used the user class UserInfo, which used

-(void)encodeWithCoder:(NSCoder *)encoder { NSData *imageData = UIImagePNGRepresentation(categoryImage); [encoder encodeObject:categoryName forKey:@"name"]; [encoder encodeObject:imageData forKey:@"image"]; } 

- (id) initWithCoder: (NSCoder *) decoder and userInfo.categoryImage is a UIImage variable.

reason: '- [UIImage encodeWithCoder:]: unrecognized selector sent to instance 0x7676a70'

 userInfo = [[UserInfo alloc] init]; userInfo.categoryName = categoryName.text; NSLog(@"Category Name:--->%@",userInfo.categoryName); userInfo.categoryImage = image; appDelegate.categoryData = [[NSMutableDictionary dictionaryWithObjectsAndKeys: userInfo.categoryName, @"name",userInfo.categoryImage,@"image", nil] mutableCopy]; [appDelegate.categories addObject:appDelegate.categoryData]; NSLog(@"Category Data:--->%@",appDelegate.categories); [appDelegate.categories addObject:userInfo.categoryName]; [appDelegate.categories addObject:userInfo.categoryImage]; [self saveCustomObject:userInfo.categoryName]; [self saveCustomObject:userInfo.categoryImage]; -(void)saveCustomObject:(UserInfo *)obj { appDelegate.userDefaults = [NSUserDefaults standardUserDefaults]; NSData *myEncodedObject = [NSKeyedArchiver archivedDataWithRootObject:obj]; [appDelegate.userDefaults setObject:myEncodedObject forKey:@"myEncodedObjectKey"]; } 

So help me how can I store and retrieve uiimage using nsusedefaults ???

Answer 1

UIImage does not implement the NSCoding protocol, so you have an error.

Store:

 NSData* imageData = UIImagePNGRepresentation(image); NSData* myEncodedImageData = [NSKeyedArchiver archivedDataWithRootObject:imageData]; [appDelegate.userDefaults setObject:myEncodedImageData forKey:@"myEncodedImageDataKey"]; } 

Recovery:

 NSData* myEncodedImageData = [appDelegate.userDefaults objectForKey:@"myEncodedImageDataKey"]; UIImage* image = [UIImage imageWithData:myEncodedImageData]; 

Answer 2

If I were you, I will save the UIImage to a file (use the hash [myImage hash] to generate the file name) and save the file name as NSString using NSUserDefault; -)

Answer 3

Saving images in NSUserDefaults:

  [[NSUserDefaults standardUserDefaults] setObject:UIImagePNGRepresentation(image) forKey:@"image"]; 

Retrieving Images in NSUserDefaults:

 NSData* imageData = [[NSUserDefaults standardUserDefaults] objectForKey:@"image"]; UIImage* image = [UIImage imageWithData:imageData];