Find custom Object index in array

Question

I have an array of custom object called Service and in didSelectRow I populate my selected array of that object:

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    if let cell = tableView.cellForRowAtIndexPath(indexPath) {
        let services:[Service] = self.menu[indexPath.section].services
        self.selectedServices.append(services[indexPath.row])
    }
}

The problem is that I can't figure out how to retrieve it from didDeselectRow:

func tableView(tableView: UITableView, didDeselectRowAtIndexPath indexPath: NSIndexPath) {
    if let cell = tableView.cellForRowAtIndexPath(indexPath) {
        cell.accessoryType = .None
        let services = self.menu[indexPath.section].services
        let service = services[indexPath.row]
        //how can I found the index position of service inside selectedServices?

    }

}

selectedServices[indexPath.row] how about

Oleg Gordiichuk
– Oleg Gordiichuk

2017-04-14 16:42:43 +00:00
Commented Apr 14, 2017 at 16:42 — Oleg Gordiichuk
– Oleg Gordiichuk, Commented Apr 14, 2017 at 16:42
Have you tried self.selectedServices[indexPath.row] ?

AgnosticDev
– AgnosticDev

2017-04-14 16:43:56 +00:00
Commented Apr 14, 2017 at 16:43 — AgnosticDev
– AgnosticDev, Commented Apr 14, 2017 at 16:43
No please read the code

Federic
– Federic

2017-04-14 16:45:17 +00:00
Commented Apr 14, 2017 at 16:45 — Federic
– Federic, Commented Apr 14, 2017 at 16:45

Community · Accepted Answer · 2017-05-23 11:46:48Z

5

I suggest you don't store the selectedServices, but rely on UITableView.indexPathsForSelectedRows.

var selectedServices: [Service] {
    let indexPaths = self.tableView.indexPathsForSelectedRows ?? []
    return indexPaths.map { self.menu[$0.section].services[$0.row] }
}

This way, you don't need to manually maintain selectedServices and could remove the entire tableView(_:didSelectRowAtIndexPath:) function.

If you must maintain a separate state, you could find the service using index(where:) or index(of:) — see How to find index of list item in Swift?.

if let i = (self.selectedServices.index { $0 === service }) {
// find the index `i` in the array which has an item identical to `service`.
    self.selectedServices.remove(at: i)
}

edited May 23, 2017 at 11:46

CommunityBot

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answered Apr 14, 2017 at 16:45

kennytm

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1 Comment

Federic Over a year ago

Wow, that's an answer ;)

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