Added settings menu customizability to iOS.

Author: aksh1t

example/lib/main.dart

@@ -143,6 +143,7 @@ class _MyAppState extends State<MyApp> {
         iOSAllowToolbarTitleChange: false,
         toolbarTitle: 'Custom Title',
         androidSettingsMenuItems:['theme', 'scrolldirection'],
+        iOSSettingsMenuItems:['scrollDirection', 'pageTransition', 'appearance', 'brightness', 'pageMode', 'spreadFitting'],
         showActionNavigationButtons: false,
         iOSShowActionNavigationButtonLabels: false,
         pageLayoutMode: 'automatic',

ios/Classes/PspdfkitPlugin.m

@@ -135,6 +135,9 @@ - (PSPDFConfiguration *)configuration:(NSDictionary *)dictionary isImageDocument
         if (dictionary[@"isFirstPageAlwaysSingle"]) {
             builder.firstPageAlwaysSingle = [dictionary[@"isFirstPageAlwaysSingle"] boolValue];
         }
+        if (dictionary[@"settingsMenuItems"]) {
+            builder.settingsOptions = [self settingsOptions:dictionary[@"settingsMenuItems"]];
+        }
     }];
 }
 
@@ -331,6 +334,36 @@ - (PSPDFPageMode)pageMode:(NSDictionary *)dictionary {
     return pageMode;
 }
 
+- (PSPDFSettingsOptions)settingsOptions:(nullable NSArray <NSString *> *)options {
+    if ((id)options == NSNull.null || !options || options.count == 0) {
+        return PSPDFSettingsOptionDefault;
+    }
+
+    PSPDFSettingsOptions finalOptions = 0;
+
+    for (NSString *option in options) {
+        if ([option isEqualToString:@"scrollDirection"]) {
+            finalOptions |= PSPDFSettingsOptionScrollDirection;
+        } else if ([option isEqualToString:@"pageTransition"]) {
+            finalOptions |= PSPDFSettingsOptionPageTransition;
+        } else if ([option isEqualToString:@"appearance"]) {
+            finalOptions |= PSPDFSettingsOptionAppearance;
+        } else if ([option isEqualToString:@"brightness"]) {
+            finalOptions |= PSPDFSettingsOptionBrightness;
+        } else if ([option isEqualToString:@"pageMode"]) {
+            finalOptions |= PSPDFSettingsOptionPageMode;
+        } else if ([option isEqualToString:@"spreadFitting"]) {
+            finalOptions |= PSPDFSettingsOptionSpreadFitting;
+        }
+    }
+
+    if (finalOptions == 0) {
+        finalOptions = PSPDFSettingsOptionDefault;
+    }
+
+    return finalOptions;
+}
+
 - (void)setToolbarTitle:(NSString *)toolbarTitle {
     // Early return if the toolbar title is not explicitly set in the configuration dictionary.
     if (!toolbarTitle) {

lib/configuration_options.dart

@@ -89,6 +89,7 @@ const String iOSAllowToolbarTitleChange = "allowToolbarTitleChange";
 const String toolbarTitle = "toolbarTitle";
 
 const String androidSettingsMenuItems = "settingsMenuItems";
+const String iOSSettingsMenuItems = "settingsMenuItems";
 
 const String showActionNavigationButtons = "showActionNavigationButtons";
 const String iOSShowActionNavigationButtonLabels = "iOSShowActionNavigationButtonLabels";