traitCollectionDidChange strange behavior

时光怂恿深爱的人放手 提交于 2021-02-19 01:49:32

问题


override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
    super.traitCollectionDidChange(previousTraitCollection)
    if traitCollection.hasDifferentColorAppearance(comparedTo: previousTraitCollection) {
        print("changed")
    }
}

The iOS 13 application just goes to background without changing the mode (light/dark) but the "print" function is called. Is it possible to determine the moment when the mode really changed?

Thank You.


回答1:


I observed this myself as well.
The user interface toggles as soon as you go to the background, however - it immediately toggles back.
I guess you should simple follow the changes and react as needed.
You can find the current interface style by checking traitCollection.userInterfaceStyle.
For instance:
let isDark = traitCollection.userInterfaceStyle == .dark



来源:https://stackoverflow.com/questions/59139757/traitcollectiondidchange-strange-behavior

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