default selection on custom Radio Button in iphone - iphone

Question

I want to implement radio buttons in my app
I used https://www.cocoacontrols.com/controls/radiobutton (cocoa controls Radio Buttons) .
I want that one of them should always be selected by default. how can I achive this .
My Radio button code is as follows:
RadioButton *radioButtonForDay = [[RadioButton alloc] initWithGroupId:#"first group" index:0 ];
RadioButton *radioButtonForWeek = [[RadioButton alloc] initWithGroupId:#"first group" index:1 ];
RadioButton *radioButtonForMonth = [[RadioButton alloc] initWithGroupId:#"first group" index:2 ];
radioButtonForDay.frame = CGRectMake(40,65,22,28);
radioButtonForWeek.frame = CGRectMake(130,65,22,28);
radioButtonForMonth.frame = CGRectMake(195,65,22,28);
[self.view addSubview:radioButtonForDay];
[self.view addSubview:radioButtonForWeek];
[self.view addSubview:radioButtonForMonth];
[RadioButton addObserverForGroupId:#"first group" observer:self];
RadioButton.m
`
import "RadioButton.h"
#interface RadioButton()
-(void)defaultInit;
-(void)otherButtonSelected:(id)sender;
-(void)handleButtonTap:(id)sender;
#end
#implementation RadioButton
#synthesize groupId=_groupId;
#synthesize index=_index;
static const NSUInteger kRadioButtonWidth=22;
static const NSUInteger kRadioButtonHeight=22;
static NSMutableArray *rb_instances=nil;
static NSMutableDictionary *rb_observers=nil;
pragma mark - Observer
+(void)addObserverForGroupId:(NSString*)groupId observer:(id)observer{
if(!rb_observers){
rb_observers = [[NSMutableDictionary alloc] init];
}
if ([groupId length] > 0 && observer) {
[rb_observers setObject:observer forKey:groupId];
// Make it weak reference
//[observer release];
}
}
pragma mark - Manage Instances
+(void)registerInstance:(RadioButton*)radioButton{
if(!rb_instances){
rb_instances = [[NSMutableArray alloc] init];
}
[rb_instances addObject:radioButton];
// Make it weak reference
//[radioButton release];
}
pragma mark - Class level handler
+(void)buttonSelected:(RadioButton*)radioButton{
// Notify observers
if (rb_observers) {
id observer= [rb_observers objectForKey:radioButton.groupId];
if(observer && [observer respondsToSelector:#selector(radioButtonSelectedAtIndex:inGroup:)]){
[observer radioButtonSelectedAtIndex:radioButton.index inGroup:radioButton.groupId];
}
}
// Unselect the other radio buttons
if (rb_instances) {
for (int i = 0; i < [rb_instances count]; i++) {
RadioButton *button = [rb_instances objectAtIndex:i];
if (![button isEqual:radioButton] && [button.groupId isEqualToString:radioButton.groupId]) {
[button otherButtonSelected:radioButton];
}
}
}
}
pragma mark - Object Lifecycle
-(id)initWithGroupId:(NSString*)groupId index:(NSUInteger)index {
self = [super init];
if (self) {
_groupId = groupId;
_index = index;
// _selected = selected;
[self defaultInit];
}
return self;
}
(void)dealloc
{
//[_groupId release];
// [_button release];
// [super dealloc];
}
pragma mark - Tap handling
-(void)handleButtonTap:(id)sender{
[_button setSelected:YES];
[RadioButton buttonSelected:self];
}
-(void)otherButtonSelected:(id)sender{
// Called when other radio button instance got selected
if(_button.selected){
[_button setSelected:NO];
}
}
pragma mark - RadioButton init
-(void)defaultInit{
// Setup container view
self.frame = CGRectMake(0, 0, kRadioButtonWidth, kRadioButtonHeight);
// Customize UIButton
_button = [UIButton buttonWithType:UIButtonTypeCustom];
_button.frame = CGRectMake(0, 0,kRadioButtonWidth, kRadioButtonHeight);
_button.adjustsImageWhenHighlighted = NO;
[_button setImage:[UIImage imageNamed:#"RadioButton-Unselected"] forState:UIControlStateNormal];
[_button setImage:[UIImage imageNamed:#"RadioButton-Selected"] forState:UIControlStateSelected];
[_button addTarget:self action:#selector(handleButtonTap:) forControlEvents:UIControlEventTouchUpInside];
[self addSubview:_button];
[RadioButton registerInstance:self];
}
#end
`

Answer 1

Initially set selected image to any of your button.
[yourBtn setImage:yourImage forState:UIControlStateNormal];
And according to your code just put handleButtonTap method in RadioButton.h
-(void)handleButtonTap:(id)sender;
and in RadioButtonViewController.m
access the button which you want to select
Its for second button (i.e. RadioButton *rb2)
for (id subView in [rb2 subviews]) {
if ([subView isKindOfClass:[UIButton class]]) {
[rb2 handleButtonTap:subView];
}
}

Answer 2

Try this :
for default selection
[btnR setImage:[UIImage imageNamed:#"btnCheck.png"] forState:UIControlStateNormal];
[btnG setImage:[UIImage imageNamed:#"btnUnCheck.png"] forState:UIControlStateNormal];
[btnB setImage:[UIImage imageNamed:#"btnUnCheck.png"] forState:UIControlStateNormal];
and when you go to next view just check condition....
UIImage* selectedImg=[UIImage imageNamed:#"btnCheck.png"]; //btnCheck.png your image name
if (btnR.imageView.image == selectedImg || btnG.imageView.image == selectedImg || btnB.imageView.image == selectedImg)
{
//One of them is selected
}
else {
NSLog(#"Please Select At least One Color" );
}