SwiftUI: Modal presentation

I have regrettably little time to devote to SwiftUI. I explore when I can, although I wish I were a lot further in that journey.

Here’s my latest go, where I’m looking to build a modal presentation. Today is the first time I’ve been able to play with Modal, the storage type for a modal presentation. I tied it together with an isPresented state, but I’m wondering if I’ve done this all wrong.

I can’t help but think there’s a better way to do this. I’m using a text button for “Done” instead of a system-supplied item, so it won’t be automatically internationalized. Nor, can I find any specialty “Done” item in SFSymbols. When looking at Apple’s samples, such as Working with UI Controls, I see the same Text("Done") . While I know that Text elements are automatically localized should resources be available, is SwiftUI providing us with any core dictionary of terms?

I think using the isPresented state in the code below may be too clunky. I’d think that there would be a more direct way to coordinate a modal item. Any advice and guidance will be greatly welcomed.

I remain stuck in Mojave for most of my work, although I put an install of Catalina on a laptop. Although you can build proper SwiftUI apps using the beta Xcode, without the preview (and I’ve had no luck finding a secret default to enable it under Mojave) makes the experience way slower than working in a playground.

I’m hoping to dive next into Interfacing with UIKit.

SwiftUI: Boing!

Source: here

Note that you add the animation to the View object and update the view’s state in the gesture state handlers. The onEnded action passes a summary of the velocity, offset, and location of the gesture but I ignored it because I didn’t need it.

SwiftUI: Embracing the nonobvious?

This is going to be another day where I get to play with SwiftUI because I can’t get any real work done right now and am dealing with lots of interruptions.

This morning, I returned to yesterday’s mouse inventory sample to try to get my rounded corners working. Several people suggested that I implement my interface using a ZStack and a Rectangle, so I tried that first.

To my surprise, the Rectangle expanded my VStack and I haven’t to date figured out how to constrain its size to be no more than its sibling. I wanted the rectangle to grow weakly instead of pushing the title and total items towards the edge of the parent view, the way it did in this screenshot:

Here’s what it looks like without the monster-sized Rectangle, which I think is a much more appealing layout:

So instead, after messing around a bit, it occurred to me that everything is a view or at least everything is kind of view-ish and if so, then I could possibly apply my corner rounding to Color, which I did.


And surprise, this is what I got:

Isn’t that cool?

Although the final layout is exactly what I wanted, if you think about it, it’s not that intuitive that system uses tight placement for this and lax spacing for the one with the Rectangle.

In fact, as a developer, I’m not happy about not having direct control over the tightness of either layout or an obvious way to relate ZStack siblings. If there’s a way to describe how much content hugging I want in a ZStack layout and how to prioritize which item in that layout should guide the others, I haven’t discovered it. If you have, please let me know!

I’m still trying to learn to best use the deeply mysterious Length (and, no, don’t tell me “it’s just CGFloat“, because clearly it isn’t “just” that with all the Angle, Anchor, GeometryProxy, UnitPoint stuff,  and so forth) and apply layout relationships. Today, time allowing, I’d certainly like to learn more about the mysterious TupleView, a View created from a swift tuple of View values and see where it is used, the ForEach, which computes views on demand, Groups, EquatableView, and so forth.

SwiftUI: A little state

I wish I had more time to play. Here’s a little SwiftUI thing I threw together in the few moments I had free today. The source code is here.

Interestingly not including Color for backgrounds seems to kill my poor little sample. I suspect an overload where the type cannot be unambiguously inferred. Adding corner radiuses (shown here on the outside) destroys user interactivity. I have it commented out in the gist.

Originally, I tried to control state extrema (no negative inventory) in my model object but that led to a disconnect with the steppers. Instead, I finally found an initializer that allowed me to specify the valid range (in: range) to sanitize the user input, and disable the minus button for zero values.

A lot of the time I spent putting this together ended up with “helpful” results that looked like this:

That is to say, it’s really hard to provide a fluent functional framework in a typesafe language that feels like you’re constructing things into type erased collections because you never actually are…if that makes sense.

So far this week, I’ve managed to watch one video (the keynote) and about 20 minutes of another (the first bits introducing SwiftUI). I hope I have a chance to catch up. I’ll try to keep notes here on the website as I work through some of this stuff. It feels weird this year how far behind I am due to work commitments.

I spent today out of the office due to personal commitments and it’s been the first time I could really dive in (well, “dive” meaning for 10-20 minutes at a time here and there during the day). Loving this stuff, can’t wait to do more.

WebsearchFodder: My mouse moves but won’t click

Weirdest thing this morning. My mouse stopped working right. I could move the cursor but not click the mouse. So I swapped it out for another mouse. Same problem. So I rebooted. Same problem. I then switched to a wireless mouse and then a Bluetooth one. Same problem across the board.

I won’t make you sit through all the problem solving that went on: same issue meant that this was not a mechanical error, and not tied to, for example, specific wires, or bulging batteries or whatever. The tl;dr is this: I had taken out a magic trackpad a few hours earlier, intending to use it (but never got around to it), and left it on a counter and a child had put something on top of it.

The magic trackpad had not only powered on but was continuously, due to the weight, issuing some sort of mouse press because of the weight of the stuff dumped on top of it. Once I took the weight off, everything started working again back at my computer.

Diagnostically: the cursor moves, any right-button works, any scroll wheel works, but not the left-button. Solution: hunt around for a wireless pointing device that might be interfering. If you have Screen Sharing enabled, you can disable Bluetooth and see if that resolves the problem.

I took the batteries out of the trackpad, and put it away gently.

I’m leaving this blog post in case it ever helps anyone else out on this very weird issue. The advice out there on the web all assumes a mechanical issue either with a built-in trackpad, with a pointing device, or a system issue. This was such a sideways situation that surely I can’t be the only person it will happen to but it probably most everyone will never be affected.

Good Things: SwiftUI on Mojave in iOS Playgrounds

Yes, you can upgrade to the Catalina Beta. Or, you can keep getting work done on Mojave and still enjoy the glory of SwiftUI exploration.

  1. Install Xcode 11 beta along side your 10.2.x Xcode
  2. Using the beta, create an iOS playground. (This won’t work with macOS, which attempts to use the native frameworks, which don’t  yet support SwiftUI)
  3. Import both SwiftUI and PlaygroundSupport.
  4. Set the live view to a UIHostingController instance whose rootView conforms to View.

Here’s an outline of the basic “Hello World” setup:

From there, you can create pages for each of your SwiftUI experiments, allowing you to build short, targeted applets to expand your exploration and understanding of the new technology.

Bad things: Extension Access Control

Swift extends the courtesy of an access control annotated extension to its top level members. I’m going to call this “inheritance”, but I know there’s a better name for this but I just don’t know what it is.

Consider the following:

// Base type is public
public struct MyStruct {}

// Here, the extension is declared public, so each top level member
// "inherits" that access level.
public extension MyStruct {
  // This is public even if it is not annotated
  static var firstValue: String { return "public" }

  // This is also public but the compiler will warn.
  public static var secondValue: String { return "public but warned" }

  // This class is also public via "inheritance" 
  class PublicSubclass {
    // However, its members must be annotated. This is public
    public static let publicValue = "public"
    // This defaults to internal
    static let internalValue = "internal"

In this example, firstValue inherits the public access level from the MyStruct extension. The explicit annotation for secondValue is warned by the compiler as unnecessary.  If you treat warnings as errors, that’s a problem.

Each of the static properties are accessible outside the module except for internalValue, as even in a public class declaration, its members do not inherit its control level:

Before I start putting some preliminary style guidance out there, I’d like to point out a few more things about this. Here’s a second example:

internal class InternalType {}

extension InternalType {
  public static var value: String { return "value" }

Swift compiles this code without error. It is clearly a developer-sourced issue. The intent to make the member public is fundamentally flawed. as it exceeds the type’s access control level. This issue also exists outside of extensions, where the compiler will not warn on too-high levels for direct type members:

internal class AnotherInternalType {
  public var value = "value" // no warning

You’d imagine this is a place where the compiler should up its game, no? This is a point of code that is technically functional and compilable but whose specification undercuts the documenting nature of using access control. Shouldn’t the annotation be limited and warned here?

The compiler will find mismatches between the extension ACL and the type ACL:

And that’s where the problem comes in because the guidance I’m working on says: “Do not annotate extensions with access control levels except when working with trivial utilities”. Skipping extension ACL ensures that you can meaningfully and intentionally add access control to each member declared within that extension. Each access level is co-located with the declaration it decorates. This makes your code more easily audited and its access levels will be immediately apparent as to intent and implementation.

What are your thoughts? Can you think of any reasons why extensions should ever be ACL’ed in production code? And is this just a bug/language enhancement thing or is there something I’m missing. Thanks in advance for your feedback.

Same blog, different channel

Migration done! Welcome to the new host.

After couple of days of pure hell getting things transferred and set-up, here we are. I don’t want to even think of the billable hour cost for most people making this happen. Change is traumatic.

Ended up going with siteground.com: it has cpanel, email, and WordPress. I was about theeeesclose to going with WordPress.com’s paid plan (huge huge thanks to the wonderful Jeremy Massel). In the end, there were just too many compromises. Even with siteground there were compromises, but at least it’s not Bluehost.

Thank you to everyone for your advice and recs and patience. The only thing I regret is that I forgot to get someone a referral from all this. I apologize.

If you wrote to me in the last day and it was important please try writing again just in case… There was a period of outage where the old mail hadn’t finished updating and the new mail wasn’t fully configured.

I still have to set up my mail on a bunch of different devices, so off to do that…

Fleeing Bluehost: It’s crunch time

I have under 30 days to move from Bluehost or I’ll be locked into another year. If you don’t recall, Bluehost is infuriating. It shuts down whenever I have a traffic spike. Its SSL certificates are not automatically renewed, so every 90 days or so things fail.

My email is associated with unifiedlayer, one of the worst spam providers, which means that a lot of my outgoing email never arrives. Every time I need tech support, they try to upsell me to yet another paid service. The fees have increased and increased over time.

While I’d really love to have a statically generated site, I’m not willing to give up comments. I’m sticking with WordPress as the least turbulent solution unless someone has a better idea.

I need email. I need a wordpress site. I’d like to keep a listserv going but I can probably transfer that to slack if needed. I can’t really think of any other features that I need at this time.

  • Diogene recommended SiteGround. It offers well reviewed WordPress hosting. This sounds scary though: “For migration just use IMAP for your email and synchronize all mail locally then when you move you host sync back again with IMAP”
  • Dave DeLong says FastMail is a great solution for the mail-only axis. Hank Gay, Christopher Frederick, and Dewey concur. Christopher mentions that I can set up “SPF and DKIM records” to provide more secure ownership, whatever these things are.
  • Despite the general love for FastMail, Michael Weaver says iRedMail is a good alternative as well.
  • Matt mentioned nosupportlinuxhosting.com
  • Will suggests A2Hosting. Chris likes ASPnix.com.
  • John Woolsey pitches GreenGeeks.com.
  • Nate H suggests dreamhost (also recced by Tim as a site for “people who don’t know what they’re doing”, which is pretty much me) and siteground.
  • Mark Nichols uses WebFaction, but also supports Digital Ocean.
  • Brian Anderson suggests hostagor.com.
  • Kevin likes the roll-your own AWS solution: S3 for web, EC2 for wordpress, WorkMail for mail. Any thoughts on these?
  • Simon Davies agrees on AWS but suggests hosting email with zoho.com.
  • Dan Messing and Mark Bernstein like pair.com.

I’m looking for the simplest migration with the longest shelf life and the least worries. It should remain reasonably budget affordable as well.

I want to get this done quickly and easily and it scares me to pieces. This is, admittedly, way out of my comfort zone, which explains why I’m still with Bluehost even years after identifying the problems.

Any advice and support will be greatly appreciated.

Mojave and Folderol

If you use my Folderol app, you may encounter issues in Mojave. I have not but I can confirm that some of my users have found that their folders tend to be “sticky”, and will keep their icons and folder colors even when they’ve been changed to new ones.

If this happens to you, the easiest solution is to set up a new folder, customize it with Folderol, and transfer the contents and rename it like the old one. I have reports of the issue with 10.14.3 and 10.14.2. The most common factor among those affected is that the system is running one or more UI customizations like dark mode.

Folderol works by using Apple’s NSWorkspace method that sets an icon for a file. So the actual “work” beyond creating and blending the icon is done by that class, over which I  have no control.

I’m going to try to update the app description with a warning about the problem and add a set/remove/set sequence to see if that helps.

If you’re experiencing issues with Folderol, please let me know your OS specifics, and whether you’re using custom dark mode and/or tints. Thanks!