how to update app icon for my iPhone app?

We have an updated version of our app icon to replace the existing one, we tried to simply overwrite the old one (image file) with the new version (image file), build and then deploy, what we found on the device is still the old icon being used for our app. Is this a normal behavior, what's the "official" steps for such needs? Note that we are still in development stage, which is why we need to update our app icons based on the new art work done by our designers.

First of all delete the icon.png then select the image you want to create the icon select and drag it and put the following place and clean up your project(Cmd + shift + k).

Now the run the project and it change the icon of the application.

i think it's helpful for you