i want to make my App offline capable. How can I load all controller files at the beginning of my App? Currently the controller files only get loaded when they are needed.
I'd also say this is the best approach to answer the question: you app should be a component based app that loads the Component-preload.js file. I don't know how your dev setup looks like, but it's quite easy to generate the Component-preload.js file using grunt. Have a look at grunt-openui5 and also at the Optimizing UI5 Apps blog by Matthias Osswald. The blog Deploying UI5: Putting all the tasks together by Nigel James is another good read.
Using this approach even makes sure you have your views loaded as well. However, keep in mind that some resources like image files etc. will not be available for offline use this way. So for those other resources (which will not be part of the generated Component-preload.js file) you should implement a "pre-fetching" strategy if this is really needed (maybe inside the Component.js file).
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