Call something based on UITableView rows selected, in an IBAction - ios

Question

I just saw a post about selecting multiple UITableView rows and based on which row/rows are selected, something will happen when you press a button linked to an IBAction.
It's an interesting question and I've played around with it, but now I'm stuck a bit.
As you can see I have a NSMutableArray called selectedIndexes, and the selected row/rows are shown in the console using a NSLog. This works fine:
- (IBAction)doSomethingWithSelectedRows:(id)sender {
for (NSNumber *data in self.selectedIndexes) {
NSLog(#"Row %ld is selected.", (long)[data integerValue] +1);
}
if (WHAT SHOULD BE PUT HERE?) {
}
//Do whatever you want here.
}
The question is, what should be put in that if statement above if you want this to happen:
if (row 2 and row 1 are selected {
//Run this code.
}
UPDATE:
Here's more code:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *selectedCell = [tableView cellForRowAtIndexPath:indexPath];
if ([selectedCell accessoryType] == UITableViewCellAccessoryNone) {
[selectedCell setAccessoryType:UITableViewCellAccessoryCheckmark];
[_selectedIndexes addObject:[NSNumber numberWithInteger:indexPath.row]];
} else {
[selectedCell setAccessoryType:UITableViewCellAccessoryNone];
[_selectedIndexes removeObject:[NSNumber numberWithInteger:indexPath.row]];
}
[tableView deselectRowAtIndexPath:indexPath animated:YES];
}
- (IBAction)doSomethingWithRowsSelected:(id)sender {
for (NSNumber *data in self.selectedIndexes) {
NSLog(#"Row %ld is selected.", (long)[data integerValue] +1);
}
}

Answer 1

While you can use an array, as you do, an NSMutableIndexSet is a much better data structure for this task. It allows you to check whether a given index is in the set without having to iterate through all of the objects.
#property (strong,nonatomic) NSMutableIndexSet *selectedRows;
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
NSUInteger row = indexPath.row;
UITableViewCell *selectedCell = [tableView cellForRowAtIndexPath:indexPath];
if ([self.selectedRows containsIndex:row]) {
[self.selectedRows removeIndex:row];
[selectedCell setAccessoryType:UITableViewCellAccessoryNone];
} else {
[self.selectedRows addIndex:indexPath.row];
[selectedCell setAccessoryType:UITableViewCellAccessoryCheckmark];
}
[tableView deselectRowAtIndexPath:indexPath animated:YES];
}
Now you can easily check if any two rows are selected:
- (IBAction)doSomethingWithRowsSelected:(id)sender {
if ([self.selectedRows containsIndex:1] && [self.selectedRows containsIndex:2]) {
// Do whatever
}
}
Also, don't forget to set the accessory type in cellForRowAtIndexPath based on [self.selectedRows containsIndex:indexPath.row] otherwise your checkmarks will be wrong when you scroll.

Answer 2

Here is what I will do,
1st, get the array of selected rows by using indexPathsForSelectedRows,
2nd, iterate the array to check if if indexPath.row is 1 or 2.
3rd, if your if statement's condition is true, then do ...