I have installed iOS 14.5 but Xcode 12.4 won't install my apps to the iPhone anymore. I need the new Xcode 12.5 but this runs only under Mac OS Big Sur. My iMac is unable to install Big Sur. How can I install my apps to my iPhone? I started developing in SwiftUI only a few weeks ago and was happy to have my first tiny apps running but now Apple suddenly stops my first steps in coding with this incompatibility. I am not going to buy a new Mac only to have Big Sur running. Is this Apple's way to say "Everyone can code"?

I am a beginner in SwiftUI. For a memory game I created several buttons. I need to call each button individually to change its attributes. I can read out each button's UUID but I don't how to use the ID to call the button. In good ol' HyperTalk I would write for example: set the style of card button ID to "shadow" How can I do it in SwiftUI?