What does "invalid mode 'kCFRunLoopCommonModes' ..."mean?

uiswitch xcode11
Frederick C. Lee picture Frederick C. Lee · Jul 11, 2019 · Viewed 17.6k times · Source

Environment: Version 11.0 beta 3 (11M362v)

Here's the full text: 

invalid mode 'kCFRunLoopCommonModes' provided to CFRunLoopRunSpecific - break on _CFRunLoopError_RunCalledWithInvalidMode to debug. 
This message will only appear once per execution.
Hello World

This message only appears when I click on a UISwitch button that is connected to an action; here, printing "Hello World".

Apparently the behavior of the action isn't affected.

enter image description here

As a comparison, I've created a UIBarButtonItem in the toolbar which behaves normally. So there's something fishy about the switch button.

Question: why would this appear and what does it mean? Remedy?

Answer

Amirreza picture Amirreza · Jun 5, 2020

I think it's a warning that Apple should fix it itself. Even in this sample project which is from WWDC19 this problem exists. There is a UISwitch in a cell of a table. When I tap it, the mentioned warning is raised.

So, in my view, it is a bug that Apple should deal with.

Related questions

iOS7 UISwitch its Event ValueChanged: Calling continuously is this Bug or what..?

Edit It's now fixed on ios7.1 Don't do any tweak to fix it. Edit2 Apparently the same problem happens again in iOS 8.0 and 8.1 Edit3 It's now fixed on ios9.2 Don't do any tweak to fix it. Hi Today i seen …

Read More
Change color of UISwitch in "off" state

I've learned that we can change the UISwitch button appearance in its "on" state, but is it also possible to change the color of the UISwitch in the "off" state?

Read More
UISwitch in a UITableView cell

How can I embed a UISwitch on a UITableView cell? Examples can be seen in the settings menu. My current solution: UISwitch *mySwitch = [[[UISwitch alloc] init] autorelease]; cell.accessoryView = mySwitch;

Read More