FocusView | 支持Android TV和电视盒子遥控器移动翻页，左右移动的FocusVIew

If you don't use [weak self], then for the life time of that block, you can have a circular reference between it and the object self refers to, when an object loses a reference to it, its reference drops by one, when it reaches zero then it is deallocates and reduces the reference count of any object it has a reference to. If you have a circular reference then neither are going to reach zero, because neither is going to get to zero to deallocate itself and reduce the reference to the other. For regular objects this is a problem because they will never be deallocated, for block though, it can depend on how they are used, if they are passed to a function that uses them straight away, then once they are executed they will be deallocated, and any circular references will be cut, it may be even beneficial that whilst your block is executing that it and self can't go away, but if the block is retained as an instance variable to be called, then you have a circular reference that will never go away. The way to deal with is is to use [weak self], saying references to self are weak in this block, you can then just deal with that on each time you use it, self?.myFunction() for example, or you can create a strong reference at the beginning, it used to be you used to have to use a different variable to self, but now you can go

OutlineGroup is a full view in itself. It doesn't need a ForEach around it.
(Actually in your code you could delete the ForEach and everything will work as before.)

That also means, that (so far) it does not handle Edit Mode nor .onDelete.

BUT: If you only need two hierarchy levels (parents - children) you can do it with ForEach and DisclosureGroup and get to the result you want :)

There is a typo in your code (probably copy-paste)

You could probably use currying to solve this.

Something like this?

The message is clear, you are calling connection's login(...) before you establish actual connection. It might be caused by loss of connection immediately at connection before calling login. Since you just threw your code at us instead of making a minimal example, I could not follow. Also I have stopped used async task long ago, making it even harder to follow. Here is an example made with MVVM and Coroutine