Loading from file not working. - ios

Question

I'm taking screenshots and writing them to file with this code:
if ([[UIScreen mainScreen] respondsToSelector:#selector(scale)])
UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, NO, [UIScreen mainScreen].scale);
else
UIGraphicsBeginImageContext(self.view.bounds.size);
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
NSData * data = UIImagePNGRepresentation(image);
NSArray *directories = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [directories objectAtIndex:0];
NSString *key = [documentsDirectory stringByAppendingPathComponent:#"screenshots.archive"];
NSMutableArray *storageArray = [NSMutableArray arrayWithContentsOfFile:key];
if(!storageArray)
storageArray = [NSMutableArray arrayWithObject:data];
else
[storageArray addObject:data];
[storageArray writeToFile:key atomically:YES];
When i load the images again i do this:
pics = [[NSArray alloc] initWithContentsOfFile:[self dataFilePath]];
ScreenshotViewController *scv = [[ScreenshotViewController alloc]init];
[[self navigationController]pushViewController:scv animated:YES];
NSInteger row = indexPath.row;
[scv setImage:[pics objectAtIndex:row]];
dataFilePath method:
- (NSString *)dataFilePath
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
return [documentsDirectory stringByAppendingPathComponent:#"screenshots.archive"];
}
The problem is that that the UIImageView, in the ScreenshotViewController remains blank. I have tested all kinds of things, and it is something about the way the images get saved/loaded into the array, but i'm not sure. I have also tested that the actual screenshot part is working by putting it into a UIImageView right away and adding it to the view.
NOTE:
If i change this
[scv setImage:[pics objectAtIndex:row]];
to this
[scv.myUIImageView setImage:[pics objectAtIndex:row]];
i get this exception: [__NSCFData _isResizable]: unrecognized selector sent to instance 0x847a280.
Whats the correct way of setting the image by?
Wow it got abit messy, hope its readable.

Answer 1

At first glance, and assuming your read/write code is correct, you are saving the image with PNG representation.
Thus, when reading, you will need to create a UIImage like this:
UIImage * myPic = [UIImage imageWithData:[pics objectAtIndex:row]];
Then try showing that image