RxSwift: Typing/Idle Event Stream for NSTextView
To improve my note editing app The Archive's responsiveness, I want to find out when the user is actively editing a note. Here's how to create the idle switch in RxSwift/RxCocoa. A simple enum of .typing and .idle will do for a start. Of course, NSTextViewDelegate provides a textDidChange(_:) callback to hook into; it's based on a notification, so you can also subscribe to the NSText.didChangeNotification directly if you don't want to use a delegate. That's the input signal I'm going to use.
High Sierra: Help Main Menu is Broken and Freezes Apps
If you run macOS 10.13 High Sierra, try not to use the Help menu. It will appear to freeze the app for which you invoke the Help menu: it will not accept keyboard input anymore, emitting the NSBeep "invalid action" sound in most circumstances.
Why the Selection Changes When You Do Syntax Highlighting in a NSTextView and What You Can Do About It
On iOS, this does maybe not happen at all, but when you want to write syntax highlighting code for macOS apps, copying together stuff from around the web, you'll end up with broken application behavior. In short: when you type and the attributes of the line change, the insertion point is moved to the end of the line. That sucks.
How to Edit NSTableView Headers with a Double-Click
When you work with view-based NSTableViews, cells by default contain a NSTextField. You can edit cell contents with them. The headers are not designed to be edited, though. You don't have much control over the column headings from Interface Builder. So you have to build this yourself.