iOS Combining images to Parse.com - ios

Question

I want to combine two images and send them as one to a Parse database.
Only I get no image as result.
This is my code:
.h file
#import <UIKit/UIKit.h>
#import <Parse/Parse.h>
#interface mailViewController : UIViewController<UITextFieldDelegate>
#property (weak, nonatomic) IBOutlet UITextField *naamText;
#property (weak, nonatomic) IBOutlet UITextField *emailText;
#property (weak, nonatomic) IBOutlet UIImageView *dankView;
#property (weak, nonatomic) IBOutlet UILabel *label;
#property (weak, nonatomic) IBOutlet UIButton *buttonLogo;
#property (weak, nonatomic) IBOutlet UIImageView *mailImage;
#property (weak, nonatomic) IBOutlet UIImageView *achtergrondImage;
#property (weak, nonatomic) IBOutlet UIImageView *imageView;
#property (nonatomic, strong) UIImage *coverImage;
#property (nonatomic, strong) UIImage *achtergrond;
//#property (nonatomic, strong) UIImage *finalImage;
- (IBAction)send:(id)sender;
- (IBAction)cancel:(id)sender;
#end
.m file
#import "mailViewController.h"
#import "cat01ViewController.h"
#interface mailViewController ()
#property (nonatomic, strong) UIImage *finalImage;
#end
#implementation mailViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
self.naamText.delegate = self;
self.emailText.delegate = self;
self.mailImage.image = self.coverImage;
//hide dankwoord
self.dankView.hidden = YES;
_label.hidden = YES;
_buttonLogo.hidden = YES;
[super viewDidLoad];
}
- (void) viewWillAppear:(BOOL)animated
{
if (self.coverImage != nil)
self.mailImage.image = self.coverImage;
}
- (void)addImages{
UIImage *image1 = self.mailImage.image;
UIImage *image2 = self.achtergrond;
CGSize size = CGSizeMake(image1.size.width, image1.size.height + image2.size.height);
[image1 drawInRect:CGRectMake(0,0,size.width, image1.size.height)];
[image2 drawInRect:CGRectMake(0,image1.size.height,size.width, image2.size.height)];
self.finalImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
//Add image to view
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, self.finalImage.size.width, self.finalImage.size.height)];
imageView.image = self.finalImage;
[self.view addSubview: imageView];
}
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
[self.naamText resignFirstResponder];
[self.emailText resignFirstResponder];
}
-(BOOL)textFieldShouldReturn:(UITextField *)textField{
if (textField) {
[textField resignFirstResponder];
}
PFObject *emailadres = [PFObject objectWithClassName:#"emailadres"];
[emailadres setObject:_naamText.text forKey:#"name"];
[emailadres setObject:_emailText.text forKey:#"email"];
emailadres[#"iPad_nr"] = #"iPad 2";
[emailadres saveInBackground];
self.dankView.hidden = NO;
_label.hidden = NO;
_buttonLogo.hidden = NO;
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 5 * NSEC_PER_SEC), dispatch_get_main_queue(), ^{
_label.hidden = YES;
});
return NO;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)send:(id)sender {
[self.naamText resignFirstResponder];
[self.emailText resignFirstResponder];
UIImage *image = self.finalImage;
NSData *imageData = UIImagePNGRepresentation(image);
PFFile *imageFile = [PFFile fileWithName:#"image.png" data:imageData];
PFObject *mailPhoto = [PFObject objectWithClassName:#"mailPhoto"];
mailPhoto[#"imageName"] = #"Ikzieikzie";
mailPhoto[#"imageFile"] = imageFile;
[mailPhoto setObject:_naamText.text forKey:#"name"];
[mailPhoto setObject:_emailText.text forKey:#"email"];
mailPhoto[#"iPad_nr"] = #"iPad 1";
[mailPhoto saveInBackground];
self.dankView.hidden = NO;
_label.hidden = NO;
_buttonLogo.hidden = NO;
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 5 * NSEC_PER_SEC), dispatch_get_main_queue(), ^{
_label.hidden = YES;
});
}
- (IBAction)cancel:(id)sender {
[self.naamText resignFirstResponder];
[self.emailText resignFirstResponder];
self.dankView.hidden = NO;
_label.hidden = NO;
_buttonLogo.hidden = NO;
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 5 * NSEC_PER_SEC), dispatch_get_main_queue(), ^{
_label.hidden = YES;
});
}
#end
So, I know how to send the images individual to the Parse database... but I cant understand how to combine them and send them as one.

Answer 1

You set the local variable finalImage in addImages, you never set a class variable self.finalImage to contain the combined image, so this line
UIImage *image = self.finalImage;
probably sets image to nil.
Also, you never add the UIImageView *imageView in addImages as a subview as you've probably intended.
So to fix this code, I'd recommend creating defining finalImage as a class property at the top of the class, ex:
#interface ViewController ()
#property (nonatomic, strong) UIImage *finalImage;
#end
Then in addImages you can change the local variable finalImage to self.finalImage and properly add the UIImageView as a subview, ex:
self.finalImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
//Add image to view
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, self.finalImage.size.width, self.finalImage.size.height)];
imageView.image = self.finalImage;
[self.view addSubview: imageView];
After making these changes you can still use this line in send::
UIImage *image = self.finalImage;

Answer 2

You have misplaced the context, it should be focused to imageview object not to the image object.
Try this:
UIImage *image1 = self.mailImage.image;
UIImage *image2 = self.achtergrond;
CGSize size = CGSizeMake(image1.size.width, image1.size.height + image2.size.height);
[image1 drawInRect:CGRectMake(0,0,size.width, image1.size.height)];
[image2 drawInRect:CGRectMake(0,image1.size.height,size.width, image2.size.height)];
UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext();
//Add image to view
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, finalImage.size.width, finalImage.size.height)];
UIGraphicsBeginImageContext(size);
imageView.image = finalImage;
UIGraphicsEndImageContext();
Hope this helps.

Answer 3

So, this is the final solution! Thanks for your help!
UIImage *image1 = self.achtergrondImage.image;
UIImage *image2 = self.mailImage.image;
UIGraphicsBeginImageContext(image1.size);
[image1 drawInRect:CGRectMake(0, 0, image1.size.width, image1.size.height)];
[image2 drawInRect:CGRectMake(image1.size.width - image2.size.width, image1.size.height - image2.size.height, image2.size.width, image2.size.height)];
self.finalImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, self.finalImage.size.width, self.finalImage.size.height)];
imageView.image = self.finalImage;