Random img saving error on some iPhone 4s and iPod Touches - iphone

Question

i encountered a weird error. i will like the app to save an image into camera roll.
but a small amount of device are giving me error saving msg.
EDIT: ERROR Log
"Failed to encode image for saved photos." UserInfo=0x3e7170 {NSUnderlyingError=0x389310 "Failed to encode image for saved photos.", NSLocalizedDescription=Failed to encode image for saved photos.
May 22 14:13:34 unknown assetsd[281] <Error>: ImageIO: CGImageDestinationAddImage image parameter is nil
May 22 14:13:34 unknown assetsd[281] <Error>: ImageIO: CGImageDestinationFinalize image destination does not have enough images
May 22 14:13:34 unknown assetsd[281] <Error>: CGContextTranslateCTM: invalid context 0x0
May 22 14:13:34 unknown assetsd[281] <Error>: CGContextScaleCTM: invalid context 0x0
May 22 14:13:34 unknown assetsd[281] <Error>: CGContextSetBaseCTM: invalid context 0x0
May 22 14:13:34 unknown assetsd[281] <Error>: CGContextSaveGState: invalid context 0x0
May 22 14:13:34 unknown assetsd[281] <Error>: CGContextSetInterpolationQuality: invalid context 0x0
May 22 14:13:34 unknown assetsd[281] <Error>: CGContextTranslateCTM: invalid context 0x0
May 22 14:13:34 unknown assetsd[281] <Error>: CGContextScaleCTM: invalid context 0x0
May 22 14:13:34 unknown assetsd[281] <Error>: CGContextSetFillColorWithColor: invalid context 0x0
May 22 14:13:34 unknown assetsd[281] <Error>: CGContextFillRects: invalid context 0x0
May 22 14:13:34 unknown assetsd[281] <Error>: CGContextTranslateCTM: invalid context 0x0
May 22 14:13:34 unknown assetsd[281] <Error>: CGContextScaleCTM: invalid context 0x0
May 22 14:13:34 unknown com.apple.assetsd[281] <Notice>: May 22 14:13:34 SLQ-iTouch assetsd[281] <Error>: CGContextTranslateCTM: invalid context 0x0
May 22 14:13:34 unknown com.apple.assetsd[281] <Notice>: May 22 14:13:34 SLQ-iTouch assetsd[281] <Error>: CGContextScaleCTM: invalid context 0x0
May 22 14:13:34 unknown com.apple.assetsd[281] <Notice>: May 22 14:13:34 SLQ-iTouch assetsd[281] <Error>: CGContextSetBaseCTM: invalid context 0x0
May 22 14:13:34 unknown com.apple.assetsd[281] <Notice>: May 22 14:13:34 SLQ-iTouch assetsd[281] <Error>: CGContextSaveGState: invalid context 0x0
May 22 14:13:34 unknown com.apple.assetsd[281] <Notice>: May 22 14:13:34 SLQ-iTouch assetsd[281] <Error>: CGContextSetInterpolationQuality: invalid context 0x0
May 22 14:13:34 unknown com.apple.assetsd[281] <Notice>: May 22 14:13:34 SLQ-iTouch assetsd[281] <Error>: CGContextTranslateCTM: invalid context 0x0
May 22 14:13:34 unknown com.apple.assetsd[281] <Notice>: May 22 14:13:34 SLQ-iTouch assetsd[281] <Error>: CGContextScaleCTM: invalid context 0x0
May 22 14:13:34 unknown com.apple.assetsd[281] <Notice>: May 22 14:13:34 SLQ-iTouch assetsd[281] <Error>: CGContextSetFillColorWithColor: invalid context 0x0
May 22 14:13:34 unknown com.apple.assetsd[281] <Notice>: May 22 14:13:34 SLQ-iTouch assetsd[281] <Error>: CGContextFillRects: invalid context 0x0
May 22 14:13:34 unknown com.apple.assetsd[281] <Notice>: May 22 14:13:34 SLQ-iTouch assetsd[281] <Error>: CGContextTranslateCTM: invalid context 0x0
May 22 14:13:34 unknown com.apple.assetsd[281] <Notice>: May 22 14:13:34 SLQ-iTouch assetsd[281] <Error>: CGContextScaleCTM: invalid context 0x0
May 22 14:13:34 unknown assetsd[281] <Error>: CGContextTranslateCTM: invalid context 0x0
May 22 14:13:34 unknown assetsd[281] <Error>: CGContextTranslateCTM: invalid context 0x0
May 22 14:13:34 unknown assetsd[281] <Error>: CGContextTranslateCTM: invalid context 0x0
May 22 14:13:34 unknown assetsd[281] <Error>: CGContextConcatCTM: invalid context 0x0
May 22 14:13:34 unknown assetsd[281] <Error>: CGContextTranslateCTM: invalid context 0x0
May 22 14:13:34 unknown assetsd[281] <Error>: CGContextDrawImage: invalid context 0x0
May 22 14:13:34 unknown com.apple.assetsd[281] <Notice>: May 22 14:13:34 SLQ-iTouch assetsd[281] <Error>: CGContextTranslateCTM: invalid context 0x0
May 22 14:13:34 unknown com.apple.assetsd[281] <Notice>: May 22 14:13:34 SLQ-iTouch assetsd[281] <Error>: CGContextTranslateCTM: invalid context 0x0
May 22 14:13:34 unknown com.apple.assetsd[281] <Notice>: May 22 14:13:34 SLQ-iTouch assetsd[281] <Error>: CGContextTranslateCTM: invalid context 0x0
May 22 14:13:34 unknown com.apple.assetsd[281] <Notice>: May 22 14:13:34 SLQ-iTouch assetsd[281] <Error>: CGContextConcatCTM: invalid context 0x0
May 22 14:13:34 unknown com.apple.assetsd[281] <Notice>: May 22 14:13:34 SLQ-iTouch assetsd[281] <Error>: CGContextTranslateCTM: invalid context 0x0
May 22 14:13:34 unknown com.apple.assetsd[281] <Notice>: May 22 14:13:34 SLQ-iTouch assetsd[281] <Error>: CGContextDrawImage: invalid context 0x0
May 22 14:13:34 unknown assetsd[281] <Error>: CGContextRestoreGState: invalid context 0x0
May 22 14:13:34 unknown assetsd[281] <Error>: CGBitmapContextCreateImage: invalid context 0x0
May 22 14:13:34 unknown com.apple.assetsd[281] <Notice>: May 22 14:13:34 SLQ-iTouch assetsd[281] <Error>: CGContextRestoreGState: invalid context 0x0
May 22 14:13:34 unknown com.apple.assetsd[281] <Notice>: May 22 14:13:34 SLQ-iTouch assetsd[281] <Error>: CGBitmapContextCreateImage: invalid context 0x0
>
below are my code used to save the images.
- (IBAction)saveImage:(id)sender {
HUD = [MBProgressHUD showHUDAddedTo:self.view animated:YES];
HUD.dimBackground = YES;
HUD.labelText = #"Its saving!";
self.imageOverlay.alpha = 1;
self.savedImage = [self maskImage:self.imgView withMask:self.baseImgView];
UIImageWriteToSavedPhotosAlbum(self.savedImage, self, #selector(imageSavedToPhotosAlbum: didFinishSavingWithError: contextInfo:), nil);
}
- (void)imageSavedToPhotosAlbum:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo {
NSString *message;
NSString *title;
if (!error) {
title = NSLocalizedString(#"Save Success", #"");
message = NSLocalizedString(#"Save Success Message", #"");
HUD.customView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"Checkmark.png"]];
HUD.mode = MBProgressHUDModeCustomView;
HUD.labelText = #"We’re saved - WooHoo!!";
[HUD hide:YES afterDelay:1.5];
saved =1;
self.imageOverlay.alpha =0.85;
[self performSelector:#selector(saveSuccess) withObject:nil afterDelay:1.5];
} else
{
title = NSLocalizedString(#"Save Failed", #"");
message = [error description];
HUD.customView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"sad_face.png"]];
HUD.mode = MBProgressHUDModeCustomView;
HUD.labelText = #"Error! Try saving photo again :p";
[HUD hide:YES afterDelay:3];
}
}
- (UIImage*) maskImage:(UIImageView *)maskImage withMask:(UIImageView *)cropImage
{
UIImage *image = nil;
UIImage *imagePNG = nil;
CGSize newImageSize = CGSizeMake(cropImage.frame.size.width, cropImage.frame.size.height);
UIGraphicsBeginImageContextWithOptions(newImageSize, NO, 0.0); //retina res
[self.viewForImg.layer renderInContext:UIGraphicsGetCurrentContext()];
image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
NSData *imgData = UIImagePNGRepresentation ( image ); // get PNG representation
imagePNG = [UIImage imageWithData:imgData]; // wrap UIImage around PNG representation
return imagePNG;
}

Answer 1

- (UIImage*) maskImage:(UIImageView *)maskImage withMask:(UIImageView *)cropImage
{
UIImage *image = nil;
UIImage *imagePNG = nil;
CGSize newImageSize = CGSizeMake(cropImage.frame.size.width, cropImage.frame.size.height);
UIGraphicsBeginImageContextWithOptions(newImageSize, NO, 0.0); //retina res
[self.viewForImg.layer renderInContext:UIGraphicsGetCurrentContext()];
image = UIGraphicsGetImageFromCurrentImageContext();
NSData *imgData = UIImagePNGRepresentation ( image ); // get PNG representation
imagePNG = [UIImage imageWithData:imgData]; // wrap UIImage around PNG representation
UIGraphicsEndImageContext();
return imagePNG;
}