Question

I am wanting to press a button and alternate between two images with one UIImageView.

Right now when I run it, I press the button, the image changes but will not change back. What do I need to change in this action code to make it alternate?

- (IBAction)Change:(id)sender {
   image.image = [UIImage imageNamed:@"car.png"];

}

Answer 1

Try following code :

- (IBAction)Change:(id)sender {

        if ([sender isSelected]) 
        {  
          imageView.image = [UIImage imageNamed:@"car.png"];
          [sender setSelected:NO];  
        }
        else 
        {     
          imageView.image = [UIImage imageNamed:@"bike.png"];
          [sender setSelected:YES]; 
        }
}

---

To Display sequence image on button click.

.h file :

int counter;

.m file :

in viewDidLoad initialize counter = 0

Then

- (IBAction)Change:(id)sender {  
     counter++;
     imgView.image = [UIImage imageNamed:[NSString stringWithFormat:@"%d.png",counter]];
}

And give your image name like 1.png, 2.png, 3.png and so on…