How to show Alert if CollectionView cell is not selected in Swift 3?

Question

I am working on a Doctor Appointment App. I have a collection view in which cells are time slots. User can select time slot based on date of his favour.I placed a button under the collection view and after clicking that button user moves to next viewController. I want to show alert on clicking a button if user doesn't select any time slot. I tried a lot but not finding a solution. Thanks in advance.... check the screenshot of my view. Hoping someone would help me....

sorry, I tried finding a solution for that not in terms of coding... — Purna chandra, Nov 02 '17 at 06:41
I am not getting an idea how to implement that...once knowing that idea I can implement that.. — Purna chandra, Nov 02 '17 at 06:42
have you implemented collection view (https://stackoverflow.com/a/26837134/1305001) — Prince Kumar Sharma, Nov 02 '17 at 06:46
you need to apply check in array (that you will use to display data in collectionView) using loop. If none of the element is selected then show alert otherwise proceed. — Prince Kumar Sharma, Nov 02 '17 at 06:48
Yeah I implemented collection view. I am controlling collection view data with two buttons, left arrow button and right arrow button. Between those two buttons I placed a label and displaying date on that. when user clicking on those arrow buttons date will be changed and collection view below that label will be reloaded displaying time slots. I am displaying time slots using a dictionary which contain times and their status. I didn't understood how to apply check. can u please elaborate — Purna chandra, Nov 02 '17 at 06:56
`create an empty array -> then inside did select method add or remove elements to that array -> then when you click on that button check your array and show your alert` — caldera.sac, Nov 02 '17 at 07:02
In dictionary add additional key named selected of type bool. Default value will be 0 whenever user selects set its value to 1 that will indicate as selected. — Prince Kumar Sharma, Nov 02 '17 at 07:03
I implemented the functionality... thanks a lot both of u for the help — Purna chandra, Nov 02 '17 at 08:07

score 1 · Accepted Answer · answered Nov 06 '17 at 02:16

proceed as following:

@IBAction func buttonPressed(_ sender: Any) {
            if timeSlotsCollectionView.indexPathsForSelectedItems == [] {
                let alert = UIAlertController(title: "DID NOT SELECT A TIME SLOT", message: "Please select a time slot!", preferredStyle: UIAlertControllerStyle.alert)
                alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: nil))
                self.present(alert, animated: true, completion: nil)
            }
}

Good luck with your App

How to show Alert if CollectionView cell is not selected in Swift 3?

1 Answers1