Hi, I’m Sam

This is my blog. I also have a website thing.

Aggressively Hiding the Cursor

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I’m working on a Mac app that has a color picker in it. Here’s a screenshot:

Loupe

For this to work, I hide the cursor and have a custom view track your mouse movements. (When I say cursor I mean the pointer on screen you control with your mouse, and when I say mouse I mean your physical input device.) I use a full screen, borderless window and NSTrackingArea to do this. Nothing too crazy there. I do this to avoid dealing with custom a NSCursor since that was a lot more work.

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Automating Simple Things

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Most of my projects contain a Rakefile with some common tasks. rake is Ruby’s tool for running tasks. It’s my tool of choice for little scripts, but you could of course do whatever you want. My friend Ayaka even did a talk on scripting with Swift!

Usually my scripts are for something tedious that can be easily automated. Here’s a few examples in my own projects:

Some of the most elaborate scripts I’ve written in projects have been to automate gathering dependencies. This can be complicated depending on your setup. My goal is always for someone that isn’t a developer to clone, run the command, open Xcode, and build. That may seem like overkill, but if you make it that easy, you make it that easy for yourself and teammates which saves a ton of time.

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Cancel Borderless Window

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I just spent the last hour trying to figure out why cancelOperation wasn’t getting called in an NSWindowController subclass. At first I tried performKeyEquivalent in the window controller or in a custom NSWindow subclass. That didn’t work. I then resorted to keyDown in the window subclass and that wasn’t getting called.

After a long while, I figured out that my window wasn’t becoming key even after I called makeKeyAndOrderFront. It turns out windows with borderless in the styleMask cannot become key by default. You can solve this with a tiny amount of code in a window subclass:

class MyWindow: NSWindow {
    override var canBecomeKey: Bool {
        return true
    }
}

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Share Confirmation

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Recently, I added some visual confirmation what something was shared with the system share sheet on iOS. For things like copy or save to camera roll, there isn't visual confirmation that it worked from the system.

At first I considered making my own share actions for this and disabling the system ones but that seemed like a lot of work for adding a simple “it worked” to the screen. Then I had this idea:

func share(_ sender: UIView) {
  let viewController = UIActivityViewController(activityItems: [image], applicationActivities: nil)
  viewController.completionWithItemsHandler = { [weak self] type, completed, _, _ in
    guard completed, let title = type?.rawValue else { return }

    // Check share type and show confirmation
    if title == "com.apple.UIKit.activity.CopyToPasteboard" {
      SVProgressHUD.showSuccess(withStatus: "Copied!")
      SVProgressHUD.dismiss(withDelay: 1)
    } else if title == "com.apple.UIKit.activity.SaveToCameraRoll" {
      SVProgressHUD.showSuccess(withStatus: "Saved!")
      SVProgressHUD.dismiss(withDelay: 1)
    }
  }

  if let presentationController = viewController.popoverPresentationController {
    presentationController.sourceView = sender
  }

  present(viewController, animated: true)
}

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