If you are looking for drag and drop iOS App (Application) for your Apple phone users then I have a list of awesome application builder which facilitates you to customize your application according to your need without having any coding knowledge. You can build your mobile application just by doing a simple drag and drop activity.
Considering a common UI, there are more than 80% common features in all the application available in the market. These builders are the library of codes and simply apply that code to your application when you add any specific feature in your application. You need not to put any efforts into coding your application.
If you need any specific feature which is not available in the builder you can ask the team to code it and can estimate the costing in builder itself. There is a well known Artificial Intelligence enabled iOS App builder, www.engineer.ai which facilitates you to estimate your mobile app development costing and the time it will require to develop it.
Here is the list of iOS App Builder