How do you usually create views with button in top-left corner to create something like view presented at the picture?
Do I have to simply place button with image over the corner? Or there are some best pratices? 🙂 Just wondering.

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You will place the offset of the button like -10 (if your button is around 30×30) for X and Y.
In your example, that looks like
Pro Switcher, just look at the source there and see how he has done it.