Checkbox issues on iOS beta testing

App Inventor for iOS
1

I've just done my first test with iOS beta.
At first I tried to use an existing project. But there were many errors and an immediate crash without error messages.

I then created a new project after I found out by trial and error that the crash is apparently always generated by checkboxes.

Do I make fundamental mistakes or is it a bug here. If the latter applies, I would report it here: iOS Beta Testing

Screen1 blocks

Screen1:

grafik
grafik1613×665 87.5 KB

Screen2 blocks

Screen2:

grafik
grafik1650×785 102 KB

If I disable all block on Screen2, it crashes too:

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grafik1412×50 7.29 KB

Blocks

grafik
grafik1476×845 407 KB

Note: The Checkbox.Changed event is not triggered on iOS.
To check this: iOS_test_checkboxSwitch.aia (6.0 KB)

2 Likes
2

Tested on

  • iPhone 6s (iOS 14.0.1)
  • iPad Pro (12.9, 4th generation - iOS 14.0.1)

The problem is probably related to the fact that iOS (Xcode / Swift) does not have a (native) checkbox.

But there are a number of ways to create them, see e.g. here:

3 Likes
3

We do have the checkbox implemented (see screenshot) but it appears that if you have the Checked property enabled in the designer there is a race condition where we attempt to adjust the layer to be checked before the image is loaded. We're looking into it further.

IMG_E2914EA5DF50-1
IMG_E2914EA5DF50-11125×2436 158 KB
IMG_E2914EA5DF50-2
IMG_E2914EA5DF50-21125×2436 162 KB

1 Like
4

No, I haven't checked either of them in the designer and also see here:

grafik
grafik763×412 25.9 KB

As I said, the Checkbox.Changed event is not triggered.

5

There are actually a number of issues here, and I think I've assembled fixes for each of them at this point.

  1. CheckBox.Checked crashes the companion. I believe this is because you're setting it in the Initialize method, which is effectively the same as setting it in the designer from the point of view of the event model.
  2. CheckBox.Changed event doesn't fire.
  3. TinyDB serializes true and false as "#t" and "#f" (the Scheme representations) on iOS but as true and false on Android.
  4. unregisterEventForDelegation isn't implemented for handling disabled event blocks
2 Likes
6

So far I have always used switches instead of the checkboxes in my iOS (Xcode / Swift) apps.
But I also need checkboxes in other of my apps.

So for now I won't use any checkboxes in iOS beta testing and I'll do more tests later.

7

Hi Anke,

probably old news, but I experience similar problems with checkboxes in AI2 IOS.
If i use them (not enabled) the App doesnt even start up.
Did you manage to solve the issue?

8

No issue here with Companion. Post your blocks and the aia (or better a simple test aia).