iCleaner comes with four default themes: Default (Light), the default light theme; Default (Dark), the default dark theme; Default (Black), an even darker theme; Default (only available from iOS 13), a theme that adapts to the system-wide dark mode setting.

Custom themes can be provided by adding new folders to the /Library/iCleaner/Themes directory, containing an Info.plist file that the iCleaner app uses to style its programmatically generated UI controls. A sample directory structure would be:

  |-User
    |-Library
      |-iCleaner
        |-Themes
          |-MyTheme
            |-Info.plist
		

The table at the bottom lists the plist keys you can use, and how their values affect the app.

Keys marked as colors must be string values in RGB (#RRGGBB, ex: #FF0000 for red) or ARGB (#AARRGGBB, ex: #8000FF00 for 50% opacity green) form.

The app can also be themed via any Winterboard-compatible theming engine, in which case you can also theme its image assets.

The bundle identifier you should use is com.ivanobilenchi.icleaner. Themeable assets are located inside the iCleaner app bundle (/Applications/iCleaner.app).

If you choose to use a theming engine, a sample directory structure would be:

  |-Library
    |-Themes
      |-YourTheme.theme
        |-Bundles
          |-com.ivanobilenchi.icleaner
            |-Icon.png
            |[email protected]
            |-Info.plist
		

Key	Type	Description
General
general.userInterfaceStyle	Number	User interface style. (0 = dark; 1 = light). Note: this value influences the defaults for other numeric style keys.
general.keyboardStyle	Number	Keyboard style. (0 = dark; 1 = light).
general.tintColor	Color	Tint color for buttons, tab bar glyphs, clickable labels, progress bars and other controls.
general.inactiveColor	Color	Color for inactive or disabled controls.
general.warningColor	Color	Color used to warn the user about a potential problem.
general.errorColor	Color	Color used to signal an error or other critical situations.
general.textColor	Color	Color for text used throughout the app.
general.statusBarStyle	Number	Style for the status bar (0 = black text; 1 = white text).
general.fullScreenPresenter.style	Number	Style for full screen views (activity huds, image previews, etc.) (0 = dark; 1 = light).
scrollView.indicatorStyle	Number	Style for scroll view indicators (0 = black; 1 = white).
progressView.trackColor	Color	Color of the unfilled track of progress views.
activityIndicator.color	Color	Color of the activity indicators.
Bars
bar.style	Number	Style of navigation bars, tab bars and toolbars (0 = black; 1 = white). Note: setting this value achieves a nicer blur effect than setting bar.tintColor.
bar.translucent	Bool	Enable or disable translucency for navigation bars, tab bars and toolbars.
bar.tintColor	Color	Color of navigation bars, tab bars and toolbars. Setting this value overrides bar.style.
bar.textColor	Color	Color for text contained in navigation bars, tab bars and toolbars.
Table views
table.backgroundColor	Color	Background color for table views.
table.cell.backgroundColor	Color	Background color for table view cells.
table.cell.selectionColor	Color	Color of the highlight shown when table cells are selected.
table.cell.separatorColor	Color	Color of the separator lines between table cells.
table.headerFooterLabel.color	Color	Color of headers and footers of table view sections.
table.headerFooterLabel.shadowColor	Color	Shadow color of headers and footers of table view sections.
table.index.backgroundColor	Color	Color of the bar containing the alphabetic index for table views with many rows.
Cleanup view
cleanup.progress.fillColor	Color	Fill color of the cleanup progress indicator.
cleanup.progress.trackColor	Color	Track color of the cleanup progress indicator.
cleanup.progress.labelColor	Color	Color of the percentage label in the cleanup view.
cleanup.progress.labelShadowColor	Color	Shadow color of the percentage label in the cleanup view.
cleanup.label.color	Color	Color of the progress labels in the cleanup view.
cleanup.label.shadowColor	Color	Shadow color of the progress labels in the cleanup view.
cleanup.statusBarStyle	Number	Style for the status bar during cleanup operations (0 = black text; 1 = white text).
cleanup.fullScreenPresenter.style	Number	Style for full screen views during cleanup operations (0 = dark; 1 = light).
Text views
textView.backgroundColor	Color	Background color for views displaying text files.
textView.textColor	Color	Text color for views displaying text files.
textView.primaryHighlightColor	Color	Primary highlight color for search matches in text views.
textView.secondaryHighlightColor	Color	Secondary highlight color for search matches in text views.

• Please note that not all plist keys work on every iOS version. Specifically, theming is not supported on iOS 4.x, it's partially supported on iOS 5-6, while full support is guaranteed starting from iOS 7.