4 Ways to Build the Same Interface in SwiftUI | by Mark Lucking | Feb, 2022

Structure options in SwiftUI

Just a few many years in the past, fourth-generation languages have been all the trend — very a lot a much less is extra thought. The idea was to simplify coding to the purpose all people may do it.

Unsurprisingly they didn’t get there — 4GLs got here and went just like the wind — though the precept stays. It’s a precept that they had in thoughts once they developed SwiftUI I think — the concept to make the constructing of interfaces one thing non-programmers may do.

Now, don’t get me unsuitable, I like SwiftUI; of all of the tries Apple has made to redefine the interface code over time, it’s by far the very best. I, for one, having spent many years worrying about coordinates, love the brand new format paradigm; no extra coordinates right here we come.

However simply as non-coders quickly found with all 4GLs, SwiftUI designers can even really feel the trade-off with much less complexity is much less versatile. The extra compiler assumes, the much less selection you must make your interface stand out.

So it was with that thought in thoughts I needed to attempt to develop a easy interface doing the other, begin with the best answer and transfer ahead to probably the most complicated. Don’t fear, I’ve no plans to backport a SwiftUI interface to a UIKit — however I need to have a look to see how a lot management I can claw again from SwiftUI ought to I would like it.

So my temporary is simple. I’ve two rectangles representing my interface — an interface that should work in portrait and panorama modes. Be part of me for an exploration of 4 options to construct an ever extra complicated model of the identical code — aka an evermore versatile one you can tweak to be your individual. The interface must appear to be this so a blue sq. and a yellow one, regardless of the system’s orientation is.

Utilizing out-of-the-box SwiftUI

Okay — so if you happen to use the best doable answer to this — you’ll fail. Fail as a result of, by default, SwiftUI code will do that.

Code that appears like this.

struct Basic1: View 
var physique: some View
// Default is a VStack
Rectangle()
.fill(Shade.yellow).opacity(0.5)
Rectangle()
.fill(Shade.blue).opacity(0.5)

The issue is that the default habits assumes the format will all the time stream somehow — so a set of controls & knowledge lined up on a vertical interface or a horizontal one.

An if/else Block in SwiftUI

Bon — After all, the best answer if you happen to bought two methods to do that is an if/else block. A totally supported construction inside SwiftUI, with the one complexity right here in checking the environmental variables for the trait collections.

Ça Marche, as they are saying, works very nicely, laying issues out simply the best way we needed, however as I mentioned in the beginning, perhaps I need extra — extra management about the way it will get there.

If you’d like extra management in SwiftUI, you want the third format container; you want ZStack. Though if you happen to use it out of the field, you’ll once more fail because it merely places all the pieces into the middle by default. You could give it some format guides too. You want code like this.

Once you evaluate it to the earlier one seems fairly scary, we went from 16 strains to 64 strains. That mentioned, this works nicely, too, and provides you way more management finally whereas nonetheless giving us enough padding from these dreaded UIKit constraints that plague complicated layouts.

Structure guides are good and the answer I simply proposed works nicely — however you realize there’s an choice to go even additional — to provide your self much more flexibility — this monster one.

An answer wherein I went all out and and doubled the quantity strains to do the job once more. Though, in equity, I didn’t want the notification in there; I simply added it for good measure. With this code, not solely are you able to transition between the 2 layouts like all of the others, however you’ll be able to nearly mix-n-match them too-so-half transition if you’ll; perhaps one format stays vertical, whereas the second goes horizontal.

Lastly, I going to go nearly full circle again in the direction of these dreaded coordinate maps with this answer. It’s an instance of how to not do it I feel. The logic alone to go determine which little bit of code it executes when rather less than apparent which 4 branches.

Add to my earlier considerations to the truth that this answer is doing far an excessive amount of math in my thoughts to work out what goes the place with some actual doubts about its scalability.

The perfect one in my thoughts is the reply utilizing the essential alignment guides; the code I really feel simpler to grasp many of the others. All of which brings me to the tip of this piece. I hope you loved studying it as a lot as I did writing it and realized one thing new into the discount.

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