how to tag UIImage in UITableViewCell - iphone

Question

I want to toggle UITableViewCell image - cell.imageView.image. (eg. Red <--> Green)
If the current image is green, the image suppose to change to Red when the user click the UITableViewCell.
Once I set the image
cell.imageView.image = [UIImage imageNamed:#"Green.png"];
How to detect which image is the cell currently using?
Thanks for any help!

Answer 1

Set the tag on the imageView itself:
#define IMAGE_TAG_GREEN 50
#define IMAGE_TAG_RED 51
-(UITableViewCell*) tableView:(UITableView*) tableView cellForRowAtIndexPath:(NSIndexPath *) indexPath {
static NSString *CELL_ID = #"some_cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CELL_ID];
if(cell == nil) {
//do setup here...
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CELL_ID] autorelease];
cell.imageView.tag = //some logic here...
}
if(cell.imageView.tag == IMAGE_TAG_GREEN) {
//...
} else {
//...
}
return cell;
}
Since tag is an inherited property from UIView, you cannot use it with UIImage itself, but you can use it with UIImageView

Answer 2

It's a bit crude, but you should be able to set up an if statement like the following:
if ([cell.imageView.image isEqual:[UIImage imageNamed:#"Green.png"]]) {
// image is green;
} else {
// image is red;
}
I tested it out just to make sure and it works fine

Answer 3

I believe just add a Boolean expression and make it TRUE if it is green and FALSE if it is red.
Make this boolean expression extern type so that this could be a global expression.
Set the boolean value on clicking the image.
I believe this would be of some help.

Answer 4

I'm new to this - but I imagine you could use an if/then statement.
If (cell.imageView.image = [UIImage imageNamed:#"Green.png"]) {
cell.imageView.image = [UIImage imageNamed:#"Green.png"];
} else
{
cell.imageView.image = [UIImage imageNamed:#"Red.png"];
}
Or you could go really fancy and use the ternary operator. Something like the following (note the code below is probably wrong - but should hopefully get you started!):
cell.imageView.image = ([UIImage imageNamed:#"Green.png"]) ?
cell.imageView.image = [UIImage imageNamed:#"Green.png"]; :
cell.imageView.image = [UIImage imageNamed:#"Red.png"];
Let us know how you go with this.
Kolya