Save image to Documents folder

saveImg.m

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *savedImagePath = [documentsDirectory stringByAppendingPathComponent:
                                              [NSString stringWithFormat:@"savedImage%lu.png",arrayOfImages.count]];
NSData *imageData = UIImagePNGRepresentation(imageObject);
[imageData writeToFile:savedImagePath atomically:NO];