iOS only allows AOT compilations, which means no script loading at runtime. The only solutions you might have is to use some kind of code interpreter. As far as I know, there or some relatively good ones available, but they are always very slow.
Thank you for your answer. Then i think the Best solution is to Use a webview on the top of unity.
Does someone have some experience with unity and webview? And writing a javascript interface for unity, to load objects, materials and texture?
Thanks