How to implement check boxes functionality on UITableView in ios - ios

Question

In my ios app I have added on one button in UITableViewCell which is for check and un-check the TableViewCell products. For this I wrote below code but according to my code by default all are checked and when I scroll check boxes are un-checking
my code:
- (void)viewDidLoad {
[super viewDidLoad];
checkBoxesArray = [[NSMutableArray alloc]init];
for(int i = 0; i <15; i++){
[checkBoxesArray addObject:#""];
}
}
//TableList Delegate Methods:
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return checkBoxesArray.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *cellIdentifier = #"HistoryCell";
UITableViewCell *cell = (UITableViewCell *)[MaintableView dequeueReusableCellWithIdentifier:cellIdentifier];
if (cell == nil){
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
}
model1 = mainArray[indexPath.row];
cell.textLabel.text = model1.Name;
cell.detailTextLabel.text = model1.MasterId;
bool variable = checkBoxesArray[indexPath.row];
newBtn=[UIButton buttonWithType:UIButtonTypeCustom];
[newBtn setFrame:CGRectMake(250,5,30,30)];
[newBtn addTarget:self action:#selector(urSelector:) forControlEvents:UIControlEventTouchUpInside];
UIImage *btnImage;
if(variable == YES){
NSLog(#"1");
btnImage = [UIImage imageNamed:#"check.png"];
}else{
NSLog(#"2");
btnImage = [UIImage imageNamed:#"uncheck.png"];
}
[newBtn setImage:btnImage forState:UIControlStateNormal];
[cell addSubview:newBtn];
return cell;
}
-(void)urSelector :(UIButton*)sender{
CGPoint buttonPosition = [sender convertPoint:CGPointZero toView:MaintableView];
NSIndexPath *indexPath1 = [MaintableView indexPathForRowAtPoint:buttonPosition];
NSInteger variable = indexPath1.row;
bool variablePosition = checkBoxesArray[variable];
if (variablePosition == YES){
variablePosition= NO;
[checkBoxesArray replaceObjectAtIndex:variable withObject:[NSString stringWithFormat:#"%d",variablePosition]];
}
else{
variablePosition = YES;
[checkBoxesArray replaceObjectAtIndex:variable withObject:[NSString stringWithFormat:#"%d",variablePosition]];
}
[MaintableView reloadData];
}
#end

Answer 1

1) Add one key to your model array. Like isSelected and set it's value to NO.
2) Now when you select any cell at that time set the value of that key to YES.
3) In cellForRow, access that key which we have added and check it's value. If it's YES then set Check Image else Uncheck image.
4) Don't maintain two array so remove your checkboxarray. It will create confusion for you.

Answer 2

First Please replace your line of code in cellForRowAtIndexPath
bool variable = checkBoxesArray[indexPath.row];
with
bool variable = [checkBoxesArray[indexPath.row] length] > 0;
Because in checkBoxesArray , there are NSString type objects. and you are storing them into a bool variable . It always returns a true value to your 'variable'. So first of all you need to have a proper condition for 'check' and 'uncheck' thing. I am assuming that you want all boxes unchecked for the first time. So I put blank string for uncheck button and some value string for check button.
Again you need to replace your code in urSelctor method
bool variablePosition = checkBoxesArray[variable];
if (variablePosition == YES){
variablePosition= NO;
[checkBoxesArray replaceObjectAtIndex:variable withObject:[NSString stringWithFormat:#"%d",variablePosition]];
}
with
bool variablePosition = [checkBoxesArray[variable] length] > 0;
if (variablePosition == YES){
variablePosition= NO;
[checkBoxesArray replaceObjectAtIndex:variable withObject:#""];
}
hope these things will help you.
Happy coding... :) :) :)