i have exactly ... the same problem on ios
i was thinking about set the size of the iframe to the avalaible screen and set x to centrate ... but fail
Why do you ask a question about setting the height and width of an image when you mean using iFrame and specifically iFrame on iOS?
You must understand that asking the wrong question will not give you the right answer..
(When you ask how to make chocolate milk, nobody in their right mind will think of telling you how to make strawberry-icecream)