Try calling [self setNeedsRedraw] in your touch event.
Asker provided a solution based on this answer and the comments below.
Solution
Used:
[self addTarget:self action:@selector(buttonPressed) forControlEvents:UIControlEventTouchDown];
[self addTarget:self action:@selector(buttonDepressed) forControlEvents:UIControlEventTouchUpInside | UIControlEventTouchUpOutside | UIControlEventTouchCancel];
Where the selectors are custom functions that perform the background change.
If your code allows, I'd recommend you set the UIButton tag equal to the indexPath.row, so when its action is triggered, you can pull the tag and thus row out of the button data during the triggered method. For example, in cellForRowAtIndexPath you can set the tag:
button.tag = indexPath.row
button.addTarget(self, action: "buttonClicked:", forControlEvents: UIControlEvents.TouchUpInside)
then in buttonClicked:, you can fetch the tag and thus the row:
func buttonClicked(sender:UIButton) {
let buttonRow = sender.tag
}
Otherwise, if that isn't conducive to your code for some reason, the Swift translation of this Objective-C answer you linked to:
- (void)checkButtonTapped:(id)sender
{
CGPoint buttonPosition = [sender convertPoint:CGPointZero toView:self.tableView];
NSIndexPath *indexPath = [self.tableView indexPathForRowAtPoint:buttonPosition];
if (indexPath != nil)
{
...
}
}
is:
func checkButtonTapped(sender:AnyObject) {
let buttonPosition = sender.convert(CGPoint.zero, to: self.tableView)
let indexPath = self.tableView.indexPathForRow(at: buttonPosition)
if indexPath != nil {
...
}
}
Best Answer
I woudl suggest creating a simple image that contains the background color you want and setting that via the existing methods in the UIButton. (check Wrights Answer for the doc link).
That should do the trick. There might be an even better way to create the necessary image on the fly, but that's stuff I'm not firm in.
[edit: a bit more verbose code ]