Unable to implement radio button in iPhone - iphone

Question

I am new to iPhone,
I want to implement radio button in my app, there are three buttons in my app, button should behave like radio button.
Here is my code snippet,
UIButton *Btn1 = [UIButton buttonWithType:UIButtonTypeCustom];
Btn1.frame=CGRectMake(10, 190, 20, 20);
[Btn1 setImage:[UIImage imageNamed:#"radio-off.png"] forState:UIControlStateNormal];
[Btn1 setImage:[UIImage imageNamed:#"radio-on.png"] forState:UIControlStateSelected];
[Btn1 addTarget:self action:#selector(RadioButton:) forControlEvents:UIControlEventTouchUpInside];
[scrollVw addSubview:Btn1];
UIButton *Btn2 = [UIButton buttonWithType:UIButtonTypeCustom];
Btn2.frame=CGRectMake(10, 240, 20, 20);
[Btn2 setImage:[UIImage imageNamed:#"radio-off.png"] forState:UIControlStateNormal];
[Btn2 setImage:[UIImage imageNamed:#"radio-on.png"] forState:UIControlStateSelected];
[Btn2 addTarget:self action:#selector(RadioButton:) forControlEvents:UIControlEventTouchUpInside];
[scrollVw addSubview:Btn2];
UIButton *Btn3 = [UIButton buttonWithType:UIButtonTypeCustom];
Btn3.frame=CGRectMake(10, 290, 20, 20);
[Btn3 setImage:[UIImage imageNamed:#"radio-off.png"] forState:UIControlStateNormal];
[Btn3 setImage:[UIImage imageNamed:#"radio-on.png"] forState:UIControlStateSelected];
[Btn3 addTarget:self action:#selector(RadioButton:) forControlEvents:UIControlEventTouchUpInside];
[scrollVw addSubview:Btn3];
- (IBAction)RadioButton:(UIButton *)button{
for (UIButton *Radiobutton in [self.view subviews]) {
if ([Radiobutton isKindOfClass:[UIButton class]] && ![Radiobutton isEqual:button]) {
[Radiobutton setSelected:NO];
}
}
if (!button.selected) {
button.selected = !button.selected;
}
}
Any help will be appreciated.

Answer 1

You can use following code.
//Add all the buttons to class level NSMutable array
UIButton *Btn1 = [UIButton buttonWithType:UIButtonTypeCustom];
Btn1.frame=CGRectMake(10, 190, 20, 20);
[Btn1 setImage:[UIImage imageNamed:#"radio-off.png"] forState:UIControlStateNormal];
[Btn1 addTarget:self action:#selector(RadioButton:) forControlEvents:UIControlEventTouchUpInside];
[scrollVw addSubview:Btn1];
[self.buttonsArray addObject:Btn1];
UIButton *Btn2 = [UIButton buttonWithType:UIButtonTypeCustom];
Btn2.frame=CGRectMake(10, 240, 20, 20);
[Btn2 setImage:[UIImage imageNamed:#"radio-off.png"] forState:UIControlStateNormal];
[Btn2 addTarget:self action:#selector(RadioButton:) forControlEvents:UIControlEventTouchUpInside];
[scrollVw addSubview:Btn2];
[self.buttonsArray addObject:Btn2];
UIButton *Btn3 = [UIButton buttonWithType:UIButtonTypeCustom];
Btn3.frame=CGRectMake(10, 290, 20, 20);
[Btn3 setImage:[UIImage imageNamed:#"radio-off.png"] forState:UIControlStateNormal];
[Btn3 addTarget:self action:#selector(RadioButton:) forControlEvents:UIControlEventTouchUpInside];
[scrollVw addSubview:Btn3];
[self.buttonsArray addObject:Btn3];
- (IBAction)RadioButton:(id)sender{
[self resetAllButtons];
UIButton* button=(UIButton*) sender;
[button setImage:[UIImage imageNamed:#"radio-on.png"] forState:UIControlStateNormal];
}
-(void) resetAllButtons{
for(int i=0;i<[self.buttonsArray count];i++){
UIButton* button=[self.buttonsArray objectAtIndex:i];
[button setImage:[UIImage imageNamed:#"radio-off.png"] forState:UIControlStateNormal];
}
}

Answer 2

You are checking all views in self.view.subviews but the buttons are actually added to the UIScrollView (I guess) called scrollVw.
Change the for loop to
for (UIButton *Radiobutton in [self.scrollVw subviews]) {
if the scrollVw is added as a property in the .h file.

Answer 3

Any opposition to using a UISegmentedControl? It works like a radio button, in that it can only have one option selected at a time. If you are deadset on the appearance of radio buttons I would subclass it to change the appearance.
http://developer.apple.com/library/ios/#DOCUMENTATION/UIKit/Reference/UISegmentedControl_Class/Reference/UISegmentedControl.html

Answer 4

Alternatively you could simply use the iOS provided Control for something like that:
UISegmentedControl
It can easily handle three segments, is quite flexible and can behave like a radio button where you can select only one segment or multiple.