Add "conversation color mode" enum.

Signal/src/ViewControllers/ColorPickerViewController.swift

@@ -110,7 +110,8 @@ class ColorPickerViewController: UIViewController, UIPickerViewDelegate, UIPicke
             owsFailDebug("color was unexpectedly nil")
             return ColorView(color: .white)
         }
-        guard let color = UIColor.ows_conversationThemeColor(colorName: colorName) else {
+        guard let color = UIColor.ows_conversationColor(colorName: colorName,
+                                                        mode: Theme.isDarkThemeEnabled ? .shade : .default) else {
             owsFailDebug("unknown color name")
             return ColorView(color: .white)
         }

Signal/src/ViewControllers/ThreadSettings/OWSConversationSettingsViewController.m

@@ -288,7 +288,11 @@ const CGFloat kIconViewLength = 24;
     [mainSection addItem:[OWSTableItem
                              itemWithCustomCellBlock:^{
                                  NSString *colorName = self.thread.conversationColorName;
-                                 UIColor *currentColor = [UIColor ows_conversationThemeColorForColorName:colorName];
+                                 UIColor *currentColor = [UIColor
+                                     ows_conversationColorForColorName:colorName
+                                                                  mode:(Theme.isDarkThemeEnabled
+                                                                               ? ConversationColorMode_Shade
+                                                                               : ConversationColorMode_Default)];
                                  NSString *title = NSLocalizedString(@"CONVERSATION_SETTINGS_CONVERSATION_COLOR",
                                      @"Label for table cell which leads to picking a new conversation color");
                                  return [weakSelf disclosureCellWithName:title iconColor:currentColor];

SignalMessaging/categories/UIColor+OWS.h

@@ -7,6 +7,12 @@
 
 NS_ASSUME_NONNULL_BEGIN
 
+typedef NS_ENUM(NSUInteger, ConversationColorMode) {
+    ConversationColorMode_Default,
+    ConversationColorMode_Shade,
+    ConversationColorMode_Tint,
+};
+
 @interface UIColor (OWS)
 
 #pragma mark -
@@ -96,8 +102,9 @@ NS_ASSUME_NONNULL_BEGIN
 
 #pragma mark - Conversation Colors
 
-+ (nullable UIColor *)ows_conversationThemeColorForColorName:(NSString *)colorName
-    NS_SWIFT_NAME(ows_conversationThemeColor(colorName:));
++ (nullable UIColor *)ows_conversationColorForColorName:(NSString *)colorName
+                                                   mode:(ConversationColorMode)mode
+    NS_SWIFT_NAME(ows_conversationColor(colorName:mode:));
 
 @property (class, readonly, nonatomic) NSArray<NSString *> *ows_conversationColorNames;
 

SignalMessaging/categories/UIColor+OWS.m

@@ -459,12 +459,18 @@ NS_ASSUME_NONNULL_BEGIN
     return self.ows_conversationColorMap.allKeys;
 }
 
-+ (nullable UIColor *)ows_conversationThemeColorForColorName:(NSString *)colorName
++ (nullable UIColor *)ows_conversationColorForColorName:(NSString *)colorName mode:(ConversationColorMode)mode
 {
     OWSAssertDebug(colorName.length > 0);
 
-    BOOL isShaded = Theme.isDarkThemeEnabled;
-    return (isShaded ? self.ows_conversationColorMapShade : self.ows_conversationColorMap)[colorName];
+    switch (mode) {
+        case ConversationColorMode_Default:
+            return self.ows_conversationColorMap[colorName];
+        case ConversationColorMode_Shade:
+            return self.ows_conversationColorMapShade[colorName];
+        case ConversationColorMode_Tint:
+            return self.ows_conversationColorMapTint[colorName];
+    }
 }
 
 + (nullable UIColor *)ows_conversationTintColorForColorName:(NSString *)colorName

SignalMessaging/utils/ConversationStyle.swift

@@ -136,7 +136,8 @@ public class ConversationStyle: NSObject {
             return self.defaultBubbleColorIncoming
         }
 
-        guard let color = UIColor.ows_conversationThemeColor(colorName: colorName) else {
+        guard let color = UIColor.ows_conversationColor(colorName: colorName,
+                                                        mode: Theme.isDarkThemeEnabled ? .shade : .default) else {
             return self.defaultBubbleColorIncoming
         }
 

SignalMessaging/utils/OWSContactAvatarBuilder.m

@@ -124,7 +124,10 @@ NS_ASSUME_NONNULL_BEGIN
         [initials appendString:@"#"];
     }
 
-    UIColor *color = [UIColor ows_conversationThemeColorForColorName:self.colorName];
+    UIColor *color =
+        [UIColor ows_conversationColorForColorName:self.colorName
+                                              mode:(Theme.isDarkThemeEnabled ? ConversationColorMode_Shade
+                                                                             : ConversationColorMode_Default)];
     OWSAssertDebug(color);
 
     UIImage *_Nullable image =