Transparent Buttons in iPhone SDK

I'm trying to create a transparent button in my iPhone app -- to create an Easter Egg of sorts. How would I go about setting the but开发者_JAVA百科ton to be transparent without touching the alpha (when alpha = 0.0 on a UIButton, it no longer responds to touch)?

Thanks. :)

Set your button type to UIButtonTypeCustom and it will have no styling. (thus, it should be "invisible").

You could set the alpha to a very small value.

Or, you could create a blank, clear UIImage and use a custom button style, and set it to the button's image.

Try this

var btnTest = Ti.UI.createButton({
    backgroundImage: 'sample.png',
    height: 24,
    width: 20,
    top:  10,
    left:10
});