switch that checks NSIndexPath's row and section

potato picture potato · Mar 11, 2016 · Viewed 7.2k times · Source

I would like to set a switch statement that checks for a value if NSIndexPath. NSIndexPath is a class and it consists(among other things) of section and row (indexPath.row, indexPath.section)

this is how I would formulate an if statement to check for a row and a section at the same time:

if indexPath.section==0 && indexPath.row == 0{
//do work
}

What is swift switch translation for this?

Answer

matt picture matt · Mar 11, 2016

One way (this works because NSIndexPaths themselves are equatable):

switch indexPath {
case NSIndexPath(forRow: 0, inSection: 0) : // do something
// other possible cases
default : break
}

Or you could just test against integers, using a tuple pattern:

switch (indexPath.section, indexPath.row) {
case (0,0): // do something
// other cases
default : break
}

Another trick is to use switch true and the same condition you're already using:

switch true {
case indexPath.row == 0 && indexPath.section == 0 : // do something
// other cases
default : break
}

Personally, I would use nested switch statements where we test against indexPath.section on the outside and indexPath.row on the inside.

switch indexPath.section {
case 0:
    switch indexPath.row {
    case 0:
        // do something
    // other rows
    default:break
    }
// other sections (and _their_ rows)
default : break
}