Autolayout with Paul Hagerty

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Episode 12 – Autolayout

Here is a simple way to view the Class Size diagram for autolayout

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If your layout is quite simple, just use these orientations.

But what’s even better is if you have some layout in common, do it in the Any Height Any Width quadrant and just put the differences in the other ones above and below.

Screen Shot 2017-05-15 at 11.14.06 AM.png

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Vary for traits

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This feature of Xcode has been driving me nuts. Can’t figure it out. But I think I finally cracked it. Create a new single view application and add a label.

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Now we are going to add another label that only shows up in an big iPad.

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Doing this means only ipads with wR hR will be affected by these changes.

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So let’s make some changes. Add another label offset to the other one. Then click Done Varying.

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OK. So now we have an ipad with two labels. And when we click but to our smaller iphones, only one label is there.

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Now let’s see how this works for constraints. Let’s go back to our iphone size, and then select landscape. We will not change some constraints only for landscape using the same procedure.

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Delete the old constraints, and add some new ones.

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And if we flip back to portrait our old constraints are still there!

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What this looks like in your ViewFinder is a whole bunch of contraints that are greyed out for other orientiations and sizes.

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And if you click on one you will see it’s only active for that particular size (hC)

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Lycka till! (Good luck)

 

 

 

How to handle portrait and landscape in autolayout

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Apple has a whole new way to handle different device sizes. They call it making your apps adaptive. It’s powerful. But confusing at first. Here is how you handle going from portrait to landscape.

Great and app and stick a button in the middle with some basic constraints.

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Now what we are going to do, is add two more constraints here. One width for what the button is it portrait (or regular mode) and another for when it is in landscape (or compact height mode).

You can tell what mode you are currently in by looking here

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The way to add a specific width constraint for portrait iphone (wC hR) is to click the little ‘+’ sign and then select the variation you’d like to add.

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So this says: “Add a width constraint of 100 for any width of compact height.” When you click the ‘Add Variation’ button you’ll see this.

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That wC is a constraint that will now only be applied to widths (w) that are compact (C).

To add a constraint for landscape mode flip your view to landscape. Notice now how we are wC hC.

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Click on the width constraint. Click on that little ‘+’ sign again. And then add a constraint for the compact height scenario.

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Now we have two two widths. One which is 50 for compact, and one that is 100 for regular height.

And you can see both of these at the same time if you go to the preview inspector. Ta da!

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Note: The whole trick to this is to see what class size your device currently looks like

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And then add a matching constraint with the same C & R.

Skärmavbild 2017-01-26 kl. 6.41.38 em.png

Then that rule will only be applied for that configuration.

How to add / remove constraints depending on orientation

Find the constraint you want to be present in portrait but absent in landscape and click the ‘+’ sign by installed.

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Then choose the orientation don’t want the constant to appear for (landscape = RC)

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And then uncheck the check mark.

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That means this constraint won’t be applied for this configuration. You could do all this programmatically. But this is much easier.

 

Links that help

https://developer.apple.com/videos/play/wwdc2016/222/

 

How to make UIImageView use certain portion of iPhone display

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Create your UIImageView

Screen Shot 2017-01-24 at 8.34.41 AM.png

Then add following constraint by control dragging the UIImageView to the top and selecting

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And then adjusting the multiplier to whatever ration you want. 0.5 = 1/2 screen

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http://candycode.io/how-to-set-up-different-auto-layout-constraints-for-different-screen-sizes/

 

 

 

 

Autolayout Preview assistant editor

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To iterate faster on your autolayout use the preview assistant editor.

Click the regular preview editor you would bring up for code against a storyboard

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Then click the Automatic word in the upper lift hand corner of window

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And

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Så mycket bättre! (so much better).

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Also you can then click the ‘+’ sign to dynamically try different phone sizes to see what they look like.

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Now you can tweak without running simulator again and again. Go get em!

 

 

 

Autolayout horizontal stack view

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Say you want to layout several components together in a StackView like this

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Drag out the stackview

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And stretch it out

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Then make it the same width as the image above. Control drag the stackview to the image

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Next give it a height. In this case 70.

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Then center it to the label above. Control drag the view to the artist label.

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Then give it some distance between it and the label above.

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Cmd + alt + = to readjust the layout…

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And now we can add in the components. Drag in a button and a progress bar.

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Put the progress bar in the middle by changing the horiztal stack view alignment property.

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And then style and set sizes for the button however you wish. In this case 70×70.

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You can then tune it up however you wish.

 

 

 

 

Autolayout a simple component

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To autolayout a simple a component like this

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Start by setting a width

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Then center horizontally

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Then pin it to the top

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And voila! You constraint compliant component.

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