filter nsnull for data from method channel.

ios/Classes/Boost/FLBCollectionHelper.h

+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Alibaba Group
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+typedef bool (^FLBCollectionFilter)(id value);
+
+@interface FLBCollectionHelper : NSObject
+
++ (NSDictionary *)deepCopyNSDictionary:(NSDictionary *)origin filter:(FLBCollectionFilter)filter;
++ (NSArray *)deepCopyNSArray:(NSArray *)array filter:(FLBCollectionFilter)filter;
+
+@end
+
+NS_ASSUME_NONNULL_END

ios/Classes/Boost/FLBCollectionHelper.m

+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Alibaba Group
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#import "FLBCollectionHelper.h"
+
+@implementation FLBCollectionHelper
+
++ (NSDictionary *)deepCopyNSDictionary:(NSDictionary *)origin filter:(FLBCollectionFilter)filter
+{
+    if(origin.count < 1) return origin;
+    NSMutableDictionary *copyed = [NSMutableDictionary new];
+    [origin enumerateKeysAndObjectsUsingBlock:^(id  _Nonnull key, id  _Nonnull obj, BOOL * _Nonnull stop) {
+        
+        //Filter: Do not include invalid things
+        if(filter && !filter(obj)) return;
+        
+        if([obj isKindOfClass: NSDictionary.class]){
+            copyed[key] = [self deepCopyNSDictionary:obj filter:filter];
+        }else if([obj isKindOfClass:NSArray.class]){
+            copyed[key] = [self deepCopyNSArray:obj filter:filter];
+        }else{
+            copyed[key] = obj;
+        }
+    }];
+    
+    return copyed;
+}
+
++ (NSArray *)deepCopyNSArray:(NSArray *)origin filter:(FLBCollectionFilter)filter
+{
+    if(origin.count < 1) return origin;
+    NSMutableArray *copyed = [NSMutableArray new];
+    [origin enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
+
+        //Filter: Do not include invalid things.
+        if(filter && !filter(obj)) return;
+        
+        id nObj = nil;
+        
+        if([obj isKindOfClass: NSDictionary.class]){
+            nObj = [self deepCopyNSDictionary:obj filter:filter];
+        }else if([obj isKindOfClass:NSArray.class]){
+            nObj = [self deepCopyNSArray:obj filter:filter];
+        }else{
+            nObj = obj;
+        }
+    
+        if (nObj) {
+            [copyed addObject:nObj];
+        }
+    }];
+    
+    return copyed;
+}
+
+@end

ios/Classes/Boost/FlutterBoostPlugin2.m

@@ -26,6 +26,7 @@
 #import "FlutterBoostPlugin2_private.h"
 #import "FLB2Factory.h"
 #import "BoostMessageChannel.h"
+#import "FLBCollectionHelper.h"
 
 #define NSNull2Nil(_x_) if([_x_ isKindOfClass: NSNull.class]) _x_ = nil;
 
@@ -49,7 +50,10 @@
     } else if([@"__event__" isEqual: call.method]){
         [BoostMessageChannel handleMethodCall:call result:result];
     }else if([@"closePage" isEqualToString:call.method]){
-        NSDictionary *args = call.arguments;
+        NSDictionary *args = [FLBCollectionHelper deepCopyNSDictionary:call.arguments
+                                                                filter:^bool(id  _Nonnull value) {
+                                                    return ![value isKindOfClass:NSNull.class];
+        }];
         NSDictionary *exts = args[@"exts"];
         NSString *uid = args[@"uniqueId"];
         NSDictionary *resultData = args[@"result"];
@@ -69,7 +73,10 @@
                                                               object:newName];
         }
     }else if([@"openPage" isEqualToString:call.method]){
-        NSDictionary *args = call.arguments;
+        NSDictionary *args = [FLBCollectionHelper deepCopyNSDictionary:call.arguments
+                                                                filter:^bool(id  _Nonnull value) {
+                                                                    return ![value isKindOfClass:NSNull.class];
+                                                                }];
         NSString *url = args[@"url"];
         NSDictionary *urlParams = args[@"urlParams"];
         NSDictionary *exts = args[@"exts"];