How do you determine if one string starts with another, in Swift? Surely that’s exactly what the hasPrefix(_:) method is for: No can haz etiquette? Wot? The problem is that hasPrefix is not meant for general use with human text; it’s barely better than a byte-wise comparison. It only guarantees that it won’t be fooled… Read more
SwiftUI provides a way to provide a contextual menu for a view, with contextMenu(menuItems:) and friends, but it requires you to manually specify the entire contents of the contextual menu. That means it does not include the standard Services submenu. A brief history of Contextual Menus Contextual menus were introduced [to the Mac] in 1997… Read more
This is a linker warning I see frequently since Xcode 15.0. It appears it’s a result of Apple’s new linker, “ld_prime”, which replaced “ld64” that was in use [by Apple] since around 2005 (per Quinn the Eskimo). ☝️ “ld_prime” might be an internal code name, or perhaps is just Quinn’s personal nomenclature. The actual binary… Read more
If you try to copy a regular folder (what Xcode calls a “Group”) into a file list for any Build Phase, Xcode refuses. But it does work if you use a folder reference . I have been unable to deduce any reason for this.
Ugh. This was annoying to figure out. If you have a framework target in Xcode with a modulemap – e.g. because you’re wrapping a C or C++ library for use in Swift – you must keep the module verifier enabled (the ENABLE_MODULE_VERIFIER build setting) for that framework, otherwise any Swift targets using that framework won’t… Read more
SwiftUI doesn’t offer anything equivalent to NSFilePromiseProvider, i.e. to write data to the drop destination. You have to ditch SwiftUI and use AppKit’s drag & drop APIs instead. FB13583826. Is that it? I know that’s not a very helpful in some sense, but I wasted days trying to figure out how to implement this very… Read more
I find FileManager‘s url(for:in:appropriateFor:create:) to be very unintuitive. It seems to have multiple, largely-orthogonal functions. It can provide paths to common folders (albeit badly). It can create temporary folders. It can locate volume-specific bins (Trash folders). It is an example of bad API design. Specifically, regarding cohesion: the principle that an API should have one… Read more