To quickly jump to a method or property in the open file press Ctrl+F12 to open the File Structure view, then you can fuzzy search to the member you want.
The File Structure view can also be opened by going to Navigate | File Structure in the menus.
Better than Ctrl+F
This is more accurate than using Ctrl+F to search for members because the find function is a simple text search and will find member usages as well as the member declaration, almost always resulting in you pressing Enter several times before arriving at the declaration. The File Structure view will always take you directly to the declaration.
Press Cmd+F12 to open the File Structure view.