Swift - 如何在UITableview中获取所选行的数值

Question

I have a multiple selection on a UITableview made in Swift and I declare an Array that holds the NSIndexPaths of the selected UITableView Cells.

self.selectedRows = self.preferencesTableView.indexPathsForSelectedRows()

How do I convert this array to readable terms. eg self.selectedRows is NSlogged like :

Selected Items Strings [ {length = 2, path = 0 - 1}, {length = 2, path = 0 - 0}, {length = 2, path = 0 - 3}]

I wan to be able to convert this to : 1,2,3 .

In Objective CI enumerateObjectsWithOptions through the array and add the id of the array to a mutable array to get what I want.

[self.selectedRows enumerateObjectsWithOptions:NSEnumerationReverse
usingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
        NSIndexPath *indexPath = obj;
        [self.selectedCategorieItems addObject:[[[self.categoryArr
objectAtIndex:0] objectForKey:@"id"]objectAtIndex:indexPath.row]];
    }];

How do I do this in Swift?

Answer 1

You can use map function to return array of indices. It takes closure as argument and iterate over each element of array. $0 is first argument, in our case this is selected index path:

let rows = self.tableView.indexPathsForSelectedRows()?.map{$0.row}

Please note that rows constant will be optional

Answer 2

对于swift 2.3

let rows = tableView.indexPathsForSelectedRows.map{$0.map{$0.row}}