Select one row in each section of UITableView ios? - ios

Question

Scenario:
I have made 2 sections in one UITableView and the user needs to select a row in each section as shown in the screenshot below.
Expected Outcome:
1. User should be able to select a row in each section
Outcome right now:
1. After I have selected row in one section, and then when I select the row in second section, the first selection disappears.
Here is my code:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
// Uncheck the previous checked row
long sec=indexPath.section;
if(sec==0){
if(self->checkedIndexPath)
{
UITableViewCell* uncheckCell = [tableView
cellForRowAtIndexPath:self->checkedIndexPath];
uncheckCell.accessoryType = UITableViewCellAccessoryNone;
}
if([self->checkedIndexPath isEqual:indexPath])
{
self->checkedIndexPath = nil;
}
else
{
UITableViewCell* cell = [tableView cellForRowAtIndexPath:indexPath];
cell.accessoryType = UITableViewCellAccessoryCheckmark;
self->checkedIndexPath = indexPath;
}}
if(sec==1){
if(self->checkedIndexPath)
{
UITableViewCell* uncheckCell = [tableView
cellForRowAtIndexPath:self->checkedIndexPath];
uncheckCell.accessoryType = UITableViewCellAccessoryNone;
}
if([self->checkedIndexPath isEqual:indexPath])
{
self->checkedIndexPath = nil;
}
else
{
UITableViewCell* cell = [tableView cellForRowAtIndexPath:indexPath];
cell.accessoryType = UITableViewCellAccessoryCheckmark;
self->checkedIndexPath = indexPath;
}
}
}
Help is appreciated.

Answer 1

This is the simplest way.
Finally i found a solution. It works for me, hope it will work for you.
declare these
#interface ViewController ()
{
int selectedsection;
NSMutableArray *selectedindex;
}
Replace didSelectRowAtIndexPath as follows:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
// Uncheck the previous checked row
NSIndexPath *selectedIndexPath = [tableView indexPathForSelectedRow];
if(self.checkedIndexPath)
{
for (int i=0; i<[selectedindex count]; i++) {
NSIndexPath *temp= [selectedindex objectAtIndex:i];
if (temp.section==selectedIndexPath.section) {
UITableViewCell* uncheckCell = [tableView
cellForRowAtIndexPath:temp];
uncheckCell.accessoryType = UITableViewCellAccessoryNone;
}
}
NSInteger numb= [tableView numberOfRowsInSection:selectedIndexPath.section];
if (selectedsection==selectedIndexPath.section) {
UITableViewCell* uncheckCell = [tableView
cellForRowAtIndexPath:self.checkedIndexPath];
uncheckCell.accessoryType = UITableViewCellAccessoryNone;
}
}
if([self.checkedIndexPath isEqual:indexPath])
{
for (int i=0; i<[selectedindex count]; i++) {
NSIndexPath *temp= [selectedindex objectAtIndex:i];
if (temp.section==selectedIndexPath.section) {
UITableViewCell* uncheckCell = [tableView
cellForRowAtIndexPath:temp];
uncheckCell.accessoryType = UITableViewCellAccessoryNone;
}
}
self.checkedIndexPath = nil;
}
else
{
for (int i=0; i<[selectedindex count]; i++) {
NSIndexPath *temp= [selectedindex objectAtIndex:i];
if (temp.section==selectedIndexPath.section) {
UITableViewCell* uncheckCell = [tableView
cellForRowAtIndexPath:temp];
uncheckCell.accessoryType = UITableViewCellAccessoryNone;
}
}
UITableViewCell* cell = [tableView cellForRowAtIndexPath:indexPath];
cell.accessoryType = UITableViewCellAccessoryCheckmark;
self.checkedIndexPath = indexPath;
[selectedindex addObject:indexPath];
selectedsection=indexPath.section;
NSLog(#"check");
}
}

Answer 2

You can enable the multiple selection in the tableview:
self.tableView.allowsMultipleSelection = YES;

Answer 3

I wrote a sample code where a compound datasource holds datasource objects for each section. Sounds complicated but actually provides an easy to extend architecture. And keeps your view controller small.
The advantages of this approach:
Small ViewController
ViewController set ups view and handles user interaction — as it should be in MVC
Reusable datasources
by using different datasources per section easy to customize cells for each section
the base datasource architecture
This provides easy extension and is simple to reuse.
#import UIKit;
#interface ComoundTableViewDataSource : NSObject
#property (nonatomic,strong, readonly) NSMutableDictionary *internalDictionary;
-(void) setDataSource:(id<UITableViewDataSource>)dataSource forSection:(NSUInteger)section;
-(instancetype)initWithTableView:(UITableView *)tableView;
#end
#import "ComoundTableViewDataSource.h"
#interface ComoundTableViewDataSource () <UITableViewDataSource>
#property (nonatomic,strong, readwrite) NSMutableDictionary *internalDictionary;
#property (nonatomic, weak) UITableView *tableView;
#end
#implementation ComoundTableViewDataSource
-(instancetype)initWithTableView:(UITableView *)tableView
{
self = [super init];
if (self) {
_tableView = tableView;
tableView.dataSource = self;
_internalDictionary = [#{} mutableCopy];
[self.tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:#"Cell"];
}
return self;
}
-(void)setDataSource:(id<UITableViewDataSource>)dataSource forSection:(NSUInteger)section
{
self.internalDictionary[#(section)] = dataSource;
[self.tableView reloadData];
}
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return [[self.internalDictionary allKeys] count];
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
id<UITableViewDataSource> sectionDataSource = self.internalDictionary[#(section)];
return [sectionDataSource tableView:tableView numberOfRowsInSection:section];
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
id<UITableViewDataSource> sectionDataSource = self.internalDictionary[#(indexPath.section)];
return [sectionDataSource tableView:tableView cellForRowAtIndexPath:indexPath];
}
-(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
id<UITableViewDataSource> sectionDataSource = self.internalDictionary[#(section)];
return [sectionDataSource tableView:tableView titleForHeaderInSection:section];
}
#end
#import UIKit;
#interface SingleSectionDataSource : NSObject <UITableViewDataSource>
#property (nonatomic, strong, readonly) NSArray *array;
#property (nonatomic, strong, readonly) UITableView *tableView;
- (instancetype)initWithArray:(NSArray *)array;
#end
#import "SingleSectionDataSource.h"
#interface SingleSectionDataSource ()
#property (nonatomic, strong, readwrite) NSArray *array;
#property (nonatomic, strong, readwrite) UITableView *tableView;
#end
#implementation SingleSectionDataSource
- (instancetype)initWithArray:(NSArray *)array
{
self = [super init];
if (self) {
self.array = array;
}
return self;
}
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
self.tableView = tableView;
return self.array.count;
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"Cell" forIndexPath:indexPath];
cell.textLabel.text = self.array[indexPath.row];
return cell;
}
-(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
return [#(section) stringValue];
}
#end
the selection datasource architecture
We extend the classes from above to allow one selection per section
#import "ComoundTableViewDataSource.h"
#interface OnSelectionPerSectionComoundTableViewDataSource : ComoundTableViewDataSource
-(void)selectedCellAtIndexPath:(NSIndexPath *)indexPath;
#end
#import "OnSelectionPerSectionComoundTableViewDataSource.h"
#import "SingleSelectionSingleSectionDataSource.h"
#implementation OnSelectionPerSectionComoundTableViewDataSource
-(instancetype)initWithTableView:(UITableView *)tableView
{
self = [super initWithTableView:tableView];
if(self){
[tableView setAllowsMultipleSelection:YES];
}
return self;
}
-(void)selectedCellAtIndexPath:(NSIndexPath *)indexPath
{
SingleSelectionSingleSectionDataSource *sectionDataSource = self.internalDictionary[#(indexPath.section)];
[sectionDataSource selectedCellAtIndexPath:indexPath];
}
#end
View Controller Implementation
As promised, a very slim view controller:
#interface ViewController () <UITableViewDelegate>
#property (weak, nonatomic) IBOutlet UITableView *tableView;
#property (nonatomic, strong) OnSelectionPerSectionComoundTableViewDataSource *tableViewDataSource;
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.tableViewDataSource = [[OnSelectionPerSectionComoundTableViewDataSource alloc] initWithTableView:self.tableView];
self.tableView.delegate = self;
[self.tableViewDataSource setDataSource:[[SingleSelectionSingleSectionDataSource alloc] initWithArray:#[#"Hallo", #"Welt"]] forSection:0];
[self.tableViewDataSource setDataSource:[[SingleSelectionSingleSectionDataSource alloc] initWithArray:#[#"Hello", #"World", #"!"]] forSection:1];
[self.tableViewDataSource setDataSource:[[SingleSelectionSingleSectionDataSource alloc] initWithArray:#[#"Hola", #"Mundo", #"!", #"¿Que tal?"]] forSection:2];
}
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[self.tableViewDataSource selectedCellAtIndexPath:indexPath];
}
#end
You will want to add methods to the datasources to get the selected rows.
get the example: https://github.com/vikingosegundo/CompoundDatasourceExample
Note This code has a cell reuse issue. It is fixed on GitHub.