Here’s another little problem that has perplexed me for some time. I noticed that when using a UIActionSheet, sometimes the cancel button appears to be unresponsive. Typically it must be tapped several times before dismissing the action sheet. I finally decided to take a look around stackoverflow to see if anyone else has noticed such behavior. I found exactly the answer I was looking for. The problem is that I was using a UITableView in a UITabBarController. When I was displaying the action sheet, I was showing it from the table view. By doing this, only the top most part of the cancel button works. This is because the hit testing won’t work properly. The system will think that we are tapping on the tab bar rather than the action sheet. This is fixed by changing one line of code. Rather than use the usual
[actionSheet showInView:self.view];
instead use
[actionSheet showInView:self.parentViewController.tabBarController.view];
This will show the action sheet from the tab bar controller and hit testing will work as expected.
