问题
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.
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?
回答1:
I had a similar problem: When I got the call-back from the UISwitch, I reloaded the UITableView. I think that the call-back is initiated before the UISwitch finishes changing its context, and reloading the cell in that state creates some conflict.
With that theory, I solved my problem like so: I separated the cells into sections, where the cell with the UISwitch was in its own section. When I got the call-back from the UISwitch, I reloaded all the sections except the section that has the cell with the UISwitch.
来源：https://stackoverflow.com/questions/56980875/what-does-invalid-mode-kcfrunloopcommonmodes-mean