How select one item at a time ios sdk - ios

Question

I have a list of Option values displayed in a UITableView.
Now I want user to select one item once. But currently the user can select all the option.
What I want :
Suppose I Have 5 radio boxes : 1 2 3 4 5 at a time user can only select one . If he choses another one then Previous one must get deselected.
What is Happening Now:
Currently all of the boxes are get selected.
I am using this code in my didSelectRowAtIndex method:
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
UIButton *btnRadhio = (UIButton *)[cell viewWithTag:1];
for(int i =0;i<[arrDistanceList count];i++)
{
[btnRadhio setBackgroundImage:[UIImage imageNamed:#"radio_unchecked"] forState:UIControlStateNormal];
}
[btnRadhio setBackgroundImage:[UIImage imageNamed:#"radio_checked"] forState:UIControlStateNormal];

Answer 1

You are changing the UIButton for same index path:
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath]; //From Your Code
You have to get new indexPath each time. Try this one
for(int i =0;i<[arrDistanceList count];i++)
{
NSIndexPath *indexPathI=[NSIndexPath indexPathForRow:i inSection:0]; //i supposed you have 0 section
UITableViewCell *cellI=[tableView cellForRowAtIndexPath:indexPathI];
UIButton *btnRadhio = (UIButton *)[cellI viewWithTag:1];
if(i==indexPath.row)
{
[btnRadhio setBackgroundImage:[UIImage imageNamed:#"radio_checked"] forState:UIControlStateNormal];
}
else
{
[btnRadhio setBackgroundImage:[UIImage imageNamed:#"radio_unchecked"] forState:UIControlStateNormal];
}
}
You can check here also

Answer 2

You need to have one int class variable and store selected indexpath.row into it and reload tableview and in cellForRowAtIndexPath check this variable and check row that you have selected.

Answer 3

I will assume arrDistanceList is an array of objects, each of which represents a row of data in your table.
It is good practice that your UI is driven by your model. So let's say each object in your array has information such as 'title', 'background image' etc, consider a simple boolean flag, e.g. 'selected', which cellForRow consults.
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
UIButton *btnRadhio = (UIButton *)[cell viewWithTag:1];
id object = [arrDistanceList objectAtIndex:indexPath.row];
if (object /* .selected */) {
[btnRadhio setBackgroundImage:[UIImage imageNamed:#"radio_checked"] forState:UIControlStateNormal];
} else {
[btnRadhio setBackgroundImage:[UIImage imageNamed:#"radio_unchecked"] forState:UIControlStateNormal];
}
When making a selection in didSelect, flip the boolean for the selected object and turn off all other selections by searching with NSPredicate.
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"selected == YES"];
NSArray *filteredArray = [arrDistanceList filteredArrayUsingPredicate:predicate];
All you will need to do now is update any visible cells on screen. You can do this using tableView.visibleCells array.
It is fine updating the visible cells with a for loop on the main thread, because the number of visible cells at any one time will be relatively small. However, the arrDistanceList array may have a lot of objets within it, so you may eventually considering updating this array on a background thread one day.

Answer 4

CellforRowAtIndexPath:
cell.btnRadhio.tag = (indexpath.row+1)*100;
DisselectRowAtIndexPath:
for(int i =0;i<[arrDistanceList count];i++)
{
UIButton *btnRadhio = (UIButton *)[self.view viewWithTag:(i+1)*100];
if(i==indexpath.row)
{
[btnRadhio setBackgroundImage:[UIImage imageNamed:#"radio_checked"] forState:UIControlStateNormal];
}
else
{
[btnRadhio setBackgroundImage:[UIImage imageNamed:#"radio_unchecked"] forState:UIControlStateNormal];
}
}
Hope this will help you.