Changing UIImageView with button - iphone

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...

Answer 2

You have to maintain a flag.
In Somewhere before tapping the button, assign the flag
BOOL isFirstImageShown=YES;
Then on your button action
- (IBAction)Change:(id)sender {
if(isFirstImageShown)
{
isFirstImageShown=NO;
yourImageView.image = [UIImage imageNamed:#"yourSecondImage.png"];
}
else
{
isFirstImageShown=YES;
yourImageView.image = [UIImage imageNamed:#"yourFirstImage.png"];
}
}

Answer 3

You want that on button click you need another image you have to first set the image when you load the view and then on button click.