Question

I have a UIImage on my MyCartViewController. And i have a button on my BlackFacePlatesViewController. I want this button to set the image on the MyCartViewController to another image, however i can’t seem to get it to work. Here is my code for the button to set the image on the MyCartViewController:

EDIT:

I HAVE 1 BOOL VARIABLE IN VC2 AND WHEN THE BUTTON IS PRESSED IN VC1, I SET THE BOOL AND CREATE VC2. THEN IN THE VIEWWILLAPPEAR METHOD, I SET THE IMAGE ACCORDINGLY. HERE IS THE CODE: THANKS

- (IBAction)outlet1 {
MyCartViewController * imageCart = [[MyCartViewController alloc]init];
imageCart.displayImage = YES;

}

BUTTON THAT THE USER PRESSES ^

THIS IS TO SWITCH PAGES:

- (IBAction)myCart:(id)sender; {
MyCartViewController * first = [[MyCartViewController alloc]init];
first.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
[self presentModalViewController:first animated:YES];
[first release];

}

THIS IS THE VIEWWILLAPPEAR METHOD IN VC2:

-(void)viewWillAppear:(BOOL)animated{
if (self.displayImage == YES) {
    UIImage * myImage = [UIImage imageNamed:@"Paddle_3.png"];
    [outletImageView setImage:myImage];
}

}

WOULD THIS WORK? THANK YOU VERY MUCH FOR THE HELP EVERYBODY!!!

Answer 1

You aren’t allocating your object cart properly, and cart2 has nothing to do with cart, apart from being a similar class. You should just make an instance variable in the header file that’s a UIImage which holds the image you want to use in your next UIView, and set it when you use presentModalViewController: Try this. In your .h file,

@interface MyCartViewController : UIViewController {
  UIImage * imageForNextView;
}

In your .m file,

- (IBAction)outlet1:(id)sender; {
  imageForNextView = [UIImage imageNamed:@"Paddle_1.png"];
}

- (IBAction)outlet2:(id)sender; {
  imageForNextView = [UIImage imageNamed:@"Paddle_2.png"];
}

- (IBAction)myCart:(id)sender; {
  MyCartViewController * cart2 = [[MyCartViewController alloc]init];
  cart2.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
  cart2.newImage.image = imageForNextView;
  [self presentModalViewController:cart2 animated:YES];
  [cart2 release];
}

I made 2 button methods to illustrate the point of switching the image based on which button was pushed. Remember that imageNamed: caches the UIImage, so if you have a lot, you may have to start looking into other loading methods, all of which can be found here. This should solve your problem.

Edit: Try this. In your .h file,

@interface MyCartViewController : UIViewController {
  NSString * nameOfImage;
  UIImageView * imageView;
}

@property (nonatomic, retain) NSString * nameOfImage;

In the .m file,

@synthesize nameOfImage;

- (void)viewDidLoad; {
  [super viewDidLoad];
  imageView.image = [UIImage imageNamed:nameOfImage];
}

Then, when you push to the view, try:

- (IBAction)myCart:(id)sender; {
  MyCartViewController * cart2 = [[MyCartViewController alloc]init];
  cart2.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
  cart2.nameOfImage = @"Paddle_2.png";
  [self presentModalViewController:cart2 animated:YES];
  [cart2 release];
}

Edit2: This is a tutorial about how to use a UISplitViewController, which has a similar idea, where you press a UITableViewCell, and it changes an image in another UIView. You should look through this, and see if it can help your project.

Also, try:

- (IBAction)myCart:(id)sender; {
  MyCartViewController * cart2 = [[MyCartViewController alloc]init];
  cart2.nameOfImage = @"Paddle_2.png";
  [self pushViewController:cart2 animated:YES];
  [cart2 release];
}

This is another way to move to a new UIView, which may work.

Hope that Helps!