Checkboxes in iTunes U app are custom controls?

[drylight]

I noticed Apple's iTunes U application using checkbox controls. I was wondering if they were HTML/CSS checkboxes in a web view control, or are they custom CocoaTouch controls?

[baja_yu]

I haven't used iTunes U yet so I haven't seen them, but I doubt it's not native. There's no checkbox type control in CocoaTouch yet, or at least not a public one, but it would be pretty simple to make one. I'm sure there's a freeware one (if not many) already out there. Just Google "Custom iOS controls" and I'm sure you'll find something useful.

[MarkC]

Just use a 'custom' UIButton with images based upon a certain state, for example (this also uses a method that sets alpha and the enabled property for the button):

-(IBAction)checkboxPressed:(id)sender {
	if (!isChecked) {
        [self.btnCheckbox setImage:[UIImage imageNamed:@"tickbox_on"] forState:UIControlStateNormal];
        [self doAlpha:1.0 :YES :self.btnBuyNow];
        isChecked = YES;
    } else {
        [self.btnCheckbox setImage:[UIImage imageNamed:@"tickbox_off"] forState:UIControlStateNormal];
        [self doAlpha:0.75 :NO :self.btnBuyNow];
        isChecked = NO;
	}
}

-(void)doAlpha:(float)alpha:(BOOL)enabled:(id)UIElement {
    [UIElement setEnabled:enabled];
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:0.2];
    [UIView setAnimationDelegate:self];
    [UIElement setAlpha:alpha];
    [UIView commitAnimations];
}