Hiding the table view cells with switch ON/OFF in iPhone - iphone

Question

This may be a simple question for you experts but I can't figure out the correct solution.
In my app I created a a table view to list a no of items.
In the first row of the cell there a switch (ON/OFF).
So my client need to hide the bottom cells(other than zeroth cell) when switch is OFF and show all the cells when switch is ON.
I created the switch through code.
Can anyone please help me with how to do this?
Thanks in advance.

Answer 1

numberOfRows dataSource method - make it return 1 and reloadTableView
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
/// ....
self.switchView = [[[UISwitch alloc] initWithFrame:CGRectZero]autorelease];
cell.accessoryView = self.switchView;
[self.switchView setOn:NO animated:NO];
[self.switchView addTarget:self action:#selector(switchChanged:) forControlEvents:UIControlEventValueChanged];
//....
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
if [self.switchView.on]
return 1;
else
{
// normal code return
}
}
- (void) switchChanged:(id)sender {
[self.tableView reloadData];
}

Answer 2

You could use insertRowsAtIndexPaths, this will not only add, but also do the animation of adding new row
first add target UIControlEventTouchUpInside into UISwitch.
[switch addTarget:self action:#selector(switchChange:) forControlEvents:UIControlEventValueChanged];
-(void) switchChange:(UISwitch*) sender{
isSwitchOn = sender.on; //edited
[myTable beginUpdates];
NSIndexPath *row1 = [NSIndexPath indexPathForRow:1 inSection:0];
NSIndexPath *row2 = [NSIndexPath indexPathForRow:2 inSection:0];
//you may add as many row as you want here.
[myTable insertRowsAtIndexPaths:[NSArray arrayWithObjects:row1,row2,nil] withRowAnimation:UITableViewRowAnimationMiddle];
[myTable endUpdates];
}
and make sure you will add how many rows you will insert in numberOfRowsInSection:
(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
if (isSwitchOn) return 1;
else
return 3; //how many rows would have after switched on
}
You might want to check [myTable insertSections:withRowAnimation: to insert another section and do the same as above. but remember to state how many section you will add, in numberOfSectionsInTableView:
UPDATE :
implement deleteRowsAtIndexPaths: if switch off.
-(void) switchChange:(UISwitch*) sender{
isSwitchOn = sender.on;
if(isSwitchOn){
[myTable beginUpdates];
NSIndexPath *row1 = [NSIndexPath indexPathForRow:1 inSection:0];
NSIndexPath *row2 = [NSIndexPath indexPathForRow:2 inSection:0];
//you may add as many row as you want here.
[myTable insertRowsAtIndexPaths:[NSArray arrayWithObjects:row1,row2,nil] withRowAnimation:UITableViewRowAnimationMiddle];
[myTable endUpdates];
}
else{
[myTable beginUpdates];
NSIndexPath *row1 = [NSIndexPath indexPathForRow:1 inSection:0];
NSIndexPath *row2 = [NSIndexPath indexPathForRow:2 inSection:0];
//you may add as many row as you want here.
[myTable deleteRowsAtIndexPaths:[NSArray arrayWithObjects:row1,row2,nil] withRowAnimation:UITableViewRowAnimationFade];
[myTable endUpdates];
}
}

Answer 3

There's a UITableViewDataSource method called tableView:numberOfRows:inSections method.Just check for the state of the switch and return 1 if it's OFF or all the rows if it is ON. Just call the [tableView reloadData] method each time you switch ON and OFF. As simple as that.