Make separate permission for photo add only accesss level permission.

permission_handler/ios/Classes/PermissionHandlerEnums.h

@@ -54,6 +54,13 @@
     #define PERMISSION_PHOTOS 1
 #endif
 
+// ios: PermissionGroupPhotosAddOnly
+// Info.plist: NSPhotoLibraryUsageDescription
+// dart: PermissionGroup.photosAddOnly
+#ifndef PERMISSION_PHOTOS_ADD_ONLY
+    #define PERMISSION_PHOTOS_ADD_ONLY
+#endif
+
 // ios: [PermissionGroupLocation, PermissionGroupLocationAlways, PermissionGroupLocationWhenInUse]
 // Info.plist: [NSLocationUsageDescription, NSLocationAlwaysAndWhenInUseUsageDescription, NSLocationWhenInUseUsageDescription]
 // dart: [PermissionGroup.location, PermissionGroup.locationAlways, PermissionGroup.locationWhenInUse]
@@ -92,6 +99,7 @@ typedef NS_ENUM(int, PermissionGroup) {
     PermissionGroupMicrophone,
     PermissionGroupPhone,
     PermissionGroupPhotos,
+    PermissionGroupPhotosAddOnly,
     PermissionGroupReminders,
     PermissionGroupSensors,
     PermissionGroupSms,

permission_handler/ios/Classes/PermissionManager.m

@@ -96,7 +96,9 @@
         case PermissionGroupPhone:
             return [PhonePermissionStrategy new];
         case PermissionGroupPhotos:
-            return [PhotoPermissionStrategy new];
+            return [[PhotoPermissionStrategy alloc] initWithAccessAddOnly:false];
+        case PermissionGroupPhotosAddOnly:
+            return [[PhotoPermissionStrategy alloc] initWithAccessAddOnly:true];
         case PermissionGroupReminders:
             return [EventPermissionStrategy new];
         case PermissionGroupSensors:

permission_handler/ios/Classes/strategies/PhotoPermissionStrategy.h

@@ -11,6 +11,7 @@
 #import <Photos/Photos.h>
 
 @interface PhotoPermissionStrategy : NSObject <PermissionStrategy>
+-(instancetype)initWithAccessAddOnly:(BOOL) addOnly;
 @end
 
 #else

permission_handler/ios/Classes/strategies/PhotoPermissionStrategy.m

@@ -7,9 +7,21 @@
 
 #if PERMISSION_PHOTOS
 
-@implementation PhotoPermissionStrategy
+@implementation PhotoPermissionStrategy{
+    bool addOnlyAccessLevel;
+}
+
+- (instancetype)initWithAccessAddOnly:(BOOL)addOnly {
+    self = [super init];
+    if(self) {
+        addOnlyAccessLevel = addOnly;
+    }
+    
+    return self;
+}
+
 - (PermissionStatus)checkPermissionStatus:(PermissionGroup)permission {
-    return [PhotoPermissionStrategy permissionStatus];
+    return [PhotoPermissionStrategy permissionStatus:addOnlyAccessLevel];
 }
 
 - (ServiceStatus)checkServiceStatus:(PermissionGroup)permission {
@@ -25,7 +37,7 @@
     }
 
     if(@available(iOS 14, *)) {
-        [PHPhotoLibrary requestAuthorizationForAccessLevel:PHAccessLevelReadWrite handler:^(PHAuthorizationStatus authorizationStatus) {
+        [PHPhotoLibrary requestAuthorizationForAccessLevel:(addOnlyAccessLevel)?PHAccessLevelAddOnly:PHAccessLevelReadWrite handler:^(PHAuthorizationStatus authorizationStatus) {
             completionHandler([PhotoPermissionStrategy determinePermissionStatus:authorizationStatus]);
         }];
     }else {
@@ -35,10 +47,10 @@
     }
 }
 
-+ (PermissionStatus)permissionStatus {
++ (PermissionStatus)permissionStatus:(BOOL) addOnlyAccessLevel {
     PHAuthorizationStatus status;
     if(@available(iOS 14, *)){
-        status = [PHPhotoLibrary authorizationStatusForAccessLevel:PHAccessLevelReadWrite];
+        status = [PHPhotoLibrary authorizationStatusForAccessLevel:(addOnlyAccessLevel)?PHAccessLevelAddOnly:PHAccessLevelReadWrite];
     }else {
         status = [PHPhotoLibrary authorizationStatus];
     }