SnackbarController fails to layout its rootViewController's height correctly

[timoschwarzer]

My setup is:

• Window
  • NavigationDrawerController
    • ToolbarController
      • SnackbarController
        • my view controllers

I'm changing my view controllers by calling .transition(to: targetViewController) on the SnackbarController.
The problem I have is that my view controllers have the wrong height.

I've debugged some bounds:

// Screen's bounds
print(Screen.bounds)
// The SnackbarController's view's bounds
print(toolbarController?.rootViewController.view.bounds as! CGRect)
// The bounds of my view controller's view
print((toolbarController?.rootViewController as! AppSnackbarController).rootViewController.view.bounds)

The output was:

(0.0, 0.0, 768.0, 1024.0)
(0.0, 0.0, 768.0, 955.0)
(0.0, 0.0, 768.0, 1162.0) // This should be 955, right?

And it even becomes more weird: If change my view controller using .transition, the new view controller's height increases by 138 everytime. (It's 138 on all devices)
So if I change my view controller, it outputs:

(0.0, 0.0, 768.0, 1024.0)
(0.0, 0.0, 768.0, 955.0)
(0.0, 0.0, 768.0, 1300.0)

And if I change it again, it outputs:

(0.0, 0.0, 768.0, 1024.0)
(0.0, 0.0, 768.0, 955.0)
(0.0, 0.0, 768.0, 1438.0)

Maybe you can take a look...
Thanks!

• Timo

[timoschwarzer]

When I comment out (RootController.swift : 129)

viewController.view.frame = rootViewController.view.frame

the SnackbarController's view doesn't get larger when changing view controllers. But it's still too large.

[daniel-jonathan]

I will take a look :)

[daniel-jonathan]

Is the issue that your views are behind the TabBarController ? If so, this is not actually a Material issue, but iOS in general. You need to set the edges of the view controller. Set in your rootViewController this property:

edgesForExtendedLayout = []

[timoschwarzer]

The issue is, that the rootViewController of my SnackbarController has always the wrong height. And the height gets increased by 138 every time I change the rootViewController using .transition()

[daniel-jonathan]

I understand that. The frame doesn't get increased by any factor, rather it is made the same as the previous that is being transitioned from.

viewController.view.frame = rootViewController.view.frame

If you can share a sample that replicates this, that would be great. You are placing this inside a TabBarController, which does alter the size of UIViewControllers that are within it. Now I am not blaming that, but it is the only item that stands our right away. The RootController manages all navigation controller types (ToolbarController, MenuController, PageTabBarController, SnackbarController, etc... ) So I would suspect that the issue would manifest in all those too if there was an increase being set within the RootController.

This is where a sample project that replicates the issue would be very helpful.

[timoschwarzer]

I'll make one! :)

[daniel-jonathan]

:) Thank you!

[timoschwarzer]

Okay, this is becoming strange... But maybe you do know what happens here:

I'm adding an ActivityIndicator as the Toolbar's rightView like this:

let activityIndicator = UIActivityIndicatorView(activityIndicatorStyle: .white)
let activityIndicatorContainer = UIView(frame: CGRect())

toolbar.rightViews = [activityIndicatorContainer]

activityIndicatorContainer.autoresizesSubviews = true
activityIndicatorContainer.addSubview(activityIndicator)

activityIndicator.translatesAutoresizingMaskIntoConstraints = false
activityIndicatorContainer.addConstraint(NSLayoutConstraint(item: self.activityIndicator, attribute: .centerX, relatedBy: .equal, toItem: activityIndicatorContainer, attribute: .centerX, multiplier: 1, constant: 0))
activityIndicatorContainer.addConstraint(NSLayoutConstraint(item: self.activityIndicator, attribute: .centerY, relatedBy: .equal, toItem: activityIndicatorContainer, attribute: .centerY, multiplier: 1, constant: 0))

activityIndicator.startAnimating()

When I remove that part, we can completely forget that 138 thing, because it doesn't happen without that. (But I really want to know what happens there and how to add a vertical centered ActivityIndicator to a Toolbar)

But the view stills seems to be too high. I'm setting a tableView's background view like this (should be v- and h-centered):

let messageLabel = UILabel(frame: CGRect(x: 0, y: 0, width: self.tableView.bounds.size.width, height: self.tableView.bounds.size.height))
messageLabel.text = message!
messageLabel.textColor = Color.black
messageLabel.numberOfLines = 0;
messageLabel.textAlignment = .center;
messageLabel.font = UIFont(name: "TrebuchetMS", size: 15)
messageLabel.sizeToFit()
            
self.tableView.backgroundView = messageLabel;
self.tableView.separatorStyle = .none;

This is NavigationDrawerController > ToolbarController > SnackbarController > MyTableViewController:

And this is NavigationDrawerController > ToolbarController > PageTabbarController > MyTableViewController

[timoschwarzer]

And here is an example project. See AppDelegate.swift, line 41

NavigationDrawerController copy.zip

[daniel-jonathan]

I will take a look tomorrow :)

[daniel-jonathan]

Looking at this now :)

[timoschwarzer]

Very nice, thank you!

[daniel-jonathan]

So it all works :) I don't think you were showing the snackbar. Add this: animate(snackbar: .visible) to the AppSnackbarController class

The Snackbar is hidden by default.

[timoschwarzer]

The snackbar is not the problem. The problem is the snackbarController laying out its subviews (see the images above)

[timoschwarzer]

The first "Hello" should be centered, too, but it isn't. It's an UILabel as a TableView's backgroundView. And the TableView is inside a SnackbarController. If I put the TableView into another Controller, let's say a PageTabBarController (image #2), it is centered.

[daniel-jonathan]

Fixed the issue :) Will make a release momentarily.

[daniel-jonathan]

Please update to Material 2.3.21 :) It should be aligning correctly now. Thanks for catching this issue.

[timoschwarzer]

Wow, nice! Thank You! :-)
I will try this soon...

[timoschwarzer]

Yes, it works! Thanks! :-)