Get the number of switches set ON - ios

Question

I have this method bellow. Is there any way I can count UISwitches which are set on? Thanks!
while (i < numberOfAnswers) {
UISwitch *mySwitch = [[UISwitch alloc] initWithFrame:CGRectMake(10, y+spaceBetweenAnswers-5, 0, 30)];
mySwitch.tag = i;
[_answerView addSubview:mySwitch];
i++;
}

Answer 1

I think that it'd be better if you keep references to switches.
NSMutableArray *switches = [NSMutableArray array]; // You can do that as property
while (i < numberOfAnswers) {
UISwitch *mySwitch = [[UISwitch alloc] initWithFrame:CGRectMake(10, y+spaceBetweenAnswers-5, 0, 30)];
mySwitch.tag = i;
[_answerView addSubview:mySwitch];
i++;
[switches addObject:mySwitch];
}
Then later you don't have to iterate through every subview in view but you can iterate just switches array.
int count = 0;
for (UISwitch *switch in switches)
{
if (switch.isOn)
{
count += 1;
}
}

Answer 2

I like Piotr's solution, but if you really just want to know how many switches are on, you can also add this line to your initialization loop:
[mySwitch addTarget:self action:#selector(switchValueDidChange:) forControlEvents:UIControlEventValueChanged];
add a property to your class:
#property (nonatomic) int onCounts
And then this method:
-(void)switchValueDidChange:(UISwitch)sender {
self.onCounts = sender.on ? self.onCounts + 1 : self.onCounts - 1;
}
Now you can access the onCount property at any time to know how many switches are on.

Answer 3

Try
int count = 0;
for (UIView *subview in _answerView.subviews) {
if ([subview isKindOfClass:[UISwitch class]]) {
UISwitch *sw = (UISwitch*)subview;
count += sw.isOn ? 1 : 0;
}
}

Answer 4

here your code
int count = 0;
for (int i = start_switch_tag;i< numberOfAnswers;i++) {
if (((UISwitch *)[_answerView viewWithTag:i]).isOn) count ++;
}
NSLog(#"number of switches set ON: %d", count);