How to keep selection on radio buttons after clicking previous button - iphone

Question

For my Quiz app, i am creating 4 custom radio buttons for 4 answers by setting active and inactive images . When i select the button the state changing to active but when i press previous button the state going to inactive .
Code for creating Custom buttons
//answer 1
targetLabel = [[UILabel alloc] init];
CGSize labelSize = CGSizeMake(240, 9999);
CGSize theStringSize = [ans1 sizeWithFont:targetLabel.font constrainedToSize:labelSize lineBreakMode:targetLabel.lineBreakMode];
targetLabel.frame = CGRectMake(targetLabel0.frame.origin.x+40, targetLabel0.frame.size.height+40, theStringSize.width, theStringSize.height);
targetLabel.text = ans1;
[targetLabel setNumberOfLines:0];
targetLabel.backgroundColor=[UIColor clearColor];
[targetLabel sizeToFit];
[scroll addSubview:targetLabel];
// button 1
ans1btn = [[UIButton alloc] initWithFrame:CGRectMake(15,targetLabel.frame.origin.y-5,30,30)];
ans1btn.backgroundColor=[UIColor redColor];
[ans1btn setSelected:NO];
[ans1btn setBackgroundImage:[UIImage imageNamed:#"gray.png"]
forState:UIControlStateNormal];
[ans1btn setBackgroundImage:[UIImage imageNamed:#"green.png"]
forState:UIControlStateSelected];
ans1btn.adjustsImageWhenHighlighted=YES;
[ans1btn addTarget:self
action:#selector(checkboxSelected:)
forControlEvents:UIControlEventTouchUpInside];
ans1btn.tag=1;
[scroll addSubview:ans1btn];
Calling method
-(void)checkboxSelected:(id)sender
{
checkBoxSelected = TRUE;
[ans1btn setSelected:checkBoxSelected];
if(checkBoxSelected==TRUE)
{
checkBoxSelected1=FALSE;
[ans1btn1 setSelected:checkBoxSelected1];
[ans1btn2 setSelected:checkBoxSelected1];
[ans1btn3 setSelected:checkBoxSelected1];
checkBoxSelected=TRUE;
targetLabel.textColor=[UIColor blackColor];
targetLabel1.textColor=[UIColor grayColor];
targetLabel2.textColor=[UIColor grayColor];
targetLabel3.textColor=[UIColor grayColor];
}
else
{
NSLog(#"the button is not selected");
}
}
Like that i am calling other button actions also
Can anyone please help me.
Thanks in advance.

Answer 1

There is no actual radio button in iOS but you can use the following code to do what you want,
First, second, third and fourthButtonTags are values those already have been set in .xib or .m file. Specific numbers are also can be used.
In your .h file;
#property (strong, nonatomic) UIButton *firstButton, *secondButton, *thirdButton, *fourthButton;
In your .m file;
- (IBAction)buttonSelection:(id)sender {
UIButton *senderButton = (UIButton *) sender;
if (senderButton.tag == firstButtonTag) {
if (_firstButton.selected) {
_firstButton.selected = NO;
}
else {
_firstButton.selected = YES;
_secondButton.selected = NO;
_thirdButton.selected = NO;
_fourthButton.selected = NO;
}
}
else if (senderButton.tag == secondButtonTag) {
if (_secondButton.selected) {
_secondButton.selected = NO;
}
else {
_secondButton.selected = YES;
_firstButton.selected = NO;
_thirdButton.selected = NO;
_fourthButton.selected = NO;
}
}
else if (senderButton.tag == thirdButtonTag) {
if (_thirdButton.selected) {
_thirdButton.selected = NO;
}
else {
_thirdButton.selected = YES;
_firstButton.selected = NO;
_secondButton.selected = NO;
_fourthButton.selected = NO;
}
}
else if (senderButton.tag == fourthButtonTag) {
if (_fourthButton.selected) {
_fourthButton.selected = NO;
}
else {
_fourthButton.selected = YES;
_firstButton.selected = NO;
_secondButton.selected = NO;
_thirdButton.selected = NO;
}
}
}

Answer 2

try like this ,here define one button globally and play with that button,no need to take tag and all other stuff
#property(nonatomic,retain)UIButton *previousSelectedBtn;
- (IBAction)radioButtonSelection:(UIButton *)sender {
sender.selected=YES;
if(_previousSelectedBtn)
_previousSelectedBtn.selected=NO;
_previousSelectedBtn=sender;
}