问题

While I am developing the iOS app I need to test it in simulator with dark mode option so I can get more clarity about the app UI. But when I go to the Setting I am not getting option for dark mode as real device showing.

回答1:

In Settings, scroll down to Developer and then Dark Appearance…

回答2:

You can toggle the interface mode (i.e. Light / Dark) as well as adjust dynamic type setting on the fly (when the simulator is running) like this:

回答3:

Alternatively, you can also switch the appearance programmatically (docs):

    override func viewDidLoad() {
        super.viewDidLoad()
        #if DEBUG
        // change the appearance only while testing  
        overrideUserInterfaceStyle = .dark
        #endif
    }

回答4:

Automated Dark / Light Change

There is a way using the command line to switch a simulator between light and dark mode. If you have an array with your device IDs you can do the following:

device_ids=("C741F3CD-FDAC-49EA-A4DB-7F797B97291E" "428183B6-3EB8-4D36-9938-9D07C141BF49")

# Determine the plist value for the desired style: "dark" -> 2 / "light" -> 1
style=2

for device_id in "${device_ids[@]}"; do
  plist_path="${HOME}/Library/Developer/CoreSimulator/Devices/${device_id}/data/Library/Preferences/com.apple.uikitservices.userInterfaceStyleMode.plist"  
  printf '\n%s' "Set style $style for device $device_id ($plist_path)"

  killall "Simulator"
  xcrun simctl shutdown booted
  xcrun simctl erase $device_id

  # Crate the plist since it might not be available after erase
  [[ ! -f "$plist_path" ]] && /usr/libexec/PlistBuddy -c "save" $plist_path  
  # Set the style mode
  plutil -replace UserInterfaceStyleMode -integer $style $plist_path
done

If you want to specify device names in your script - since device IDs are different on different machines - you can also easily find the id's of them using the following bash code:

device_names=("iPhone SE" "iPhone 8" "iPhone 11 Pro" "iPhone 11 Pro Max")
device_ids=()

for name in "${device_names[@]}"; do
  id=$(xcrun simctl list --json | jq ".devices | .[] | .[] | select(.name == \"$name\") | .udid" | cut -d\" -f2)
  device_ids+=("$id")
done

`printf '%s\n' "${device_ids[@]}"`

来源：https://stackoverflow.com/questions/57988687/how-to-use-dark-mode-in-simulator-ios-13

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ios