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The solution likely did it for one of two reasons: there is another nowait loop nearby that is imbalanced and might create a case in which threads reach this loop out of order, or they were worried about running on a system with a great deal of interference that is variable by core. Using schedule(dynamic) is materially more expensive, for now until runtimes actually implement nonmonotonic properly, so static is the clear choice as long as the workload is balanced, which this snippet is. The only reason to use dynamic here would be if imbalance between threads were expected to come from somewhere else, either in the code or from interfering workloads.

This is not working, since the code in the AlternateColorDataTemplateSelector is casting the ItemSource to a List. When you're using grouping, it cannot be a simple list.

On the other hand, when you do an IndexOf on one group, you will receive the index within that group, which does not need to correspond to the index in the full list.

Find a sample repository here: https://github.com/jfversluis/GroupedListViewAlternateRowColor.

In the adapted DataTemplateSelector I flatten out the whole list and get the index from there. Here is the code:

You need to make sure that you are setting a line truncation on the Label otherwise the normal iOS LabelRenderer is going to set the Lines property to 0 (i.e. unlimited multi-line) and thus there is nothing to resize as the entire control to sized to the text size. Also you can not set the Lines via an Effect as the routing effect happens before the renderer sets its properties and it gets reset to 0;

Set the LineBreakMode property:

Explain to the user what is going on while you wait for the correct url