Add iOS native implementation

example/ios/Podfile.lock

@@ -20,9 +20,9 @@ EXTERNAL SOURCES:
 
 SPEC CHECKSUMS:
   Flutter: e0871f40cf51350855a761d2e70bf5af5b9b5de7
-  flutter_instance_manager: 02c8307bca749e95c498f5618b916badc23438f8
-  integration_test: 13825b8a9334a850581300559b8839134b124670
+  flutter_instance_manager: fd2581b919cbd3f83c541e6166ddaa4fe8e261f6
+  integration_test: ce0a3ffa1de96d1a89ca0ac26fca7ea18a749ef4
 
 PODFILE CHECKSUM: 6e700dec67e6deac9b1c69bb14c49a2217a12d15
 
-COCOAPODS: 1.14.3
+COCOAPODS: 1.15.2

ios/Classes/FLTFoundationImplementation.h

@@ -0,0 +1,41 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import <Flutter/Flutter.h>
+
+#import "foundation.pigeon.h"
+#import "FLTInstanceManager.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+/**
+ * Flutter api implementation for NSObject.
+ *
+ * Handles making callbacks to Dart for an NSObject.
+ */
+@interface FLTObjectFlutterApiImpl : FLTNSObjectFlutterApi
+- (instancetype)initWithBinaryMessenger:(id<FlutterBinaryMessenger>)binaryMessenger
+                        instanceManager:(FLTInstanceManager *)instanceManager;
+@end
+
+/**
+ * Implementation of NSObject for FWFObjectHostApiImpl.
+ */
+@interface FLTObject : NSObject
+@property(readonly, nonnull, nonatomic) FLTObjectFlutterApiImpl *objectApi;
+
+- (instancetype)initWithBinaryMessenger:(id<FlutterBinaryMessenger>)binaryMessenger
+                        instanceManager:(FLTInstanceManager *)instanceManager;
+@end
+
+/**
+ * Host api implementation for NSObject.
+ *
+ * Handles creating NSObject that intercommunicate with a paired Dart object.
+ */
+@interface FLTObjectHostApiImpl : NSObject <FLTNSObjectHostApi>
+- (instancetype)initWithInstanceManager:(FLTInstanceManager *)instanceManager;
+@end
+
+NS_ASSUME_NONNULL_END

ios/Classes/FLTFoundationImplementation.m

@@ -0,0 +1,58 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "FLTFoundationImplementation.h"
+#import <objc/runtime.h>
+
+@interface FLTObjectFlutterApiImpl ()
+// BinaryMessenger must be weak to prevent a circular reference with the host API it
+// references.
+@property(nonatomic, weak) id<FlutterBinaryMessenger> binaryMessenger;
+// InstanceManager must be weak to prevent a circular reference with the object it stores.
+@property(nonatomic, weak) FLTInstanceManager *instanceManager;
+@end
+
+@implementation FLTObjectFlutterApiImpl
+- (instancetype)initWithBinaryMessenger:(id<FlutterBinaryMessenger>)binaryMessenger
+                        instanceManager:(FLTInstanceManager *)instanceManager {
+  self = [self initWithBinaryMessenger:binaryMessenger];
+  if (self) {
+    _binaryMessenger = binaryMessenger;
+    _instanceManager = instanceManager;
+  }
+  return self;
+}
+@end
+
+@implementation FLTObject
+- (instancetype)initWithBinaryMessenger:(id<FlutterBinaryMessenger>)binaryMessenger
+                        instanceManager:(FLTInstanceManager *)instanceManager {
+  self = [self init];
+  if (self) {
+    _objectApi = [[FLTObjectFlutterApiImpl alloc] initWithBinaryMessenger:binaryMessenger
+                                                          instanceManager:instanceManager];
+  }
+  return self;
+}
+@end
+
+@interface FLTObjectHostApiImpl ()
+// InstanceManager must be weak to prevent a circular reference with the object it stores.
+@property(nonatomic, weak) FLTInstanceManager *instanceManager;
+@end
+
+@implementation FLTObjectHostApiImpl
+- (instancetype)initWithInstanceManager:(FLTInstanceManager *)instanceManager {
+  self = [self init];
+  if (self) {
+    _instanceManager = instanceManager;
+  }
+  return self;
+}
+
+- (void)disposeObjectWithIdentifier:(nonnull NSUUID *)identifier
+                              error:(FlutterError *_Nullable *_Nonnull)error {
+  [self.instanceManager removeInstanceWithIdentifier:identifier];
+}
+@end

ios/Classes/foundation.pigeon.h

@@ -0,0 +1,43 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+// Autogenerated from Pigeon (v19.0.2), do not edit directly.
+// See also: https://pub.dev/packages/pigeon
+
+#import <Foundation/Foundation.h>
+
+@protocol FlutterBinaryMessenger;
+@protocol FlutterMessageCodec;
+@class FlutterError;
+@class FlutterStandardTypedData;
+
+NS_ASSUME_NONNULL_BEGIN
+
+
+/// The codec used by FLTNSObjectHostApi.
+NSObject<FlutterMessageCodec> *FLTNSObjectHostApiGetCodec(void);
+
+/// Mirror of NSObject.
+///
+/// See https://developer.apple.com/documentation/objectivec/nsobject.
+@protocol FLTNSObjectHostApi
+- (void)disposeObjectWithIdentifier:(NSString *)identifier error:(FlutterError *_Nullable *_Nonnull)error;
+@end
+
+extern void SetUpFLTNSObjectHostApi(id<FlutterBinaryMessenger> binaryMessenger, NSObject<FLTNSObjectHostApi> *_Nullable api);
+
+extern void SetUpFLTNSObjectHostApiWithSuffix(id<FlutterBinaryMessenger> binaryMessenger, NSObject<FLTNSObjectHostApi> *_Nullable api, NSString *messageChannelSuffix);
+
+/// The codec used by FLTNSObjectFlutterApi.
+NSObject<FlutterMessageCodec> *FLTNSObjectFlutterApiGetCodec(void);
+
+/// Handles callbacks from an NSObject instance.
+///
+/// See https://developer.apple.com/documentation/objectivec/nsobject.
+@interface FLTNSObjectFlutterApi : NSObject
+- (instancetype)initWithBinaryMessenger:(id<FlutterBinaryMessenger>)binaryMessenger;
+- (instancetype)initWithBinaryMessenger:(id<FlutterBinaryMessenger>)binaryMessenger messageChannelSuffix:(nullable NSString *)messageChannelSuffix;
+- (void)disposeObjectWithIdentifier:(NSString *)identifier completion:(void (^)(FlutterError *_Nullable))completion;
+@end
+
+NS_ASSUME_NONNULL_END

ios/Classes/foundation.pigeon.m

@@ -0,0 +1,113 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+// Autogenerated from Pigeon (v19.0.2), do not edit directly.
+// See also: https://pub.dev/packages/pigeon
+
+#import "foundation.pigeon.h"
+
+#if TARGET_OS_OSX
+#import <FlutterMacOS/FlutterMacOS.h>
+#else
+#import <Flutter/Flutter.h>
+#endif
+
+#if !__has_feature(objc_arc)
+#error File requires ARC to be enabled.
+#endif
+
+static NSArray *wrapResult(id result, FlutterError *error) {
+  if (error) {
+    return @[
+      error.code ?: [NSNull null], error.message ?: [NSNull null], error.details ?: [NSNull null]
+    ];
+  }
+  return @[ result ?: [NSNull null] ];
+}
+
+static FlutterError *createConnectionError(NSString *channelName) {
+  return [FlutterError errorWithCode:@"channel-error" message:[NSString stringWithFormat:@"%@/%@/%@", @"Unable to establish connection on channel: '", channelName, @"'."] details:@""];
+}
+
+static id GetNullableObjectAtIndex(NSArray *array, NSInteger key) {
+  id result = array[key];
+  return (result == [NSNull null]) ? nil : result;
+}
+
+NSObject<FlutterMessageCodec> *FLTNSObjectHostApiGetCodec(void) {
+  static FlutterStandardMessageCodec *sSharedObject = nil;
+  sSharedObject = [FlutterStandardMessageCodec sharedInstance];
+  return sSharedObject;
+}
+
+void SetUpFLTNSObjectHostApi(id<FlutterBinaryMessenger> binaryMessenger, NSObject<FLTNSObjectHostApi> *api) {
+  SetUpFLTNSObjectHostApiWithSuffix(binaryMessenger, api, @"");
+}
+
+void SetUpFLTNSObjectHostApiWithSuffix(id<FlutterBinaryMessenger> binaryMessenger, NSObject<FLTNSObjectHostApi> *api, NSString *messageChannelSuffix) {
+  messageChannelSuffix = messageChannelSuffix.length > 0 ? [NSString stringWithFormat: @".%@", messageChannelSuffix] : @"";
+  {
+    FlutterBasicMessageChannel *channel =
+      [[FlutterBasicMessageChannel alloc]
+        initWithName:[NSString stringWithFormat:@"%@%@", @"dev.flutter.pigeon.flutter_instance_manager.NSObjectHostApi.dispose", messageChannelSuffix]
+        binaryMessenger:binaryMessenger
+        codec:FLTNSObjectHostApiGetCodec()];
+    if (api) {
+      NSCAssert([api respondsToSelector:@selector(disposeObjectWithIdentifier:error:)], @"FLTNSObjectHostApi api (%@) doesn't respond to @selector(disposeObjectWithIdentifier:error:)", api);
+      [channel setMessageHandler:^(id _Nullable message, FlutterReply callback) {
+        NSArray *args = message;
+        NSString *arg_identifier = GetNullableObjectAtIndex(args, 0);
+        FlutterError *error;
+        [api disposeObjectWithIdentifier:arg_identifier error:&error];
+        callback(wrapResult(nil, error));
+      }];
+    } else {
+      [channel setMessageHandler:nil];
+    }
+  }
+}
+NSObject<FlutterMessageCodec> *FLTNSObjectFlutterApiGetCodec(void) {
+  static FlutterStandardMessageCodec *sSharedObject = nil;
+  sSharedObject = [FlutterStandardMessageCodec sharedInstance];
+  return sSharedObject;
+}
+
+@interface FLTNSObjectFlutterApi ()
+@property(nonatomic, strong) NSObject<FlutterBinaryMessenger> *binaryMessenger;
+@property(nonatomic, strong) NSString *messageChannelSuffix;
+@end
+
+@implementation FLTNSObjectFlutterApi
+
+- (instancetype)initWithBinaryMessenger:(NSObject<FlutterBinaryMessenger> *)binaryMessenger {
+  return [self initWithBinaryMessenger:binaryMessenger messageChannelSuffix:@""];
+}
+- (instancetype)initWithBinaryMessenger:(NSObject<FlutterBinaryMessenger> *)binaryMessenger messageChannelSuffix:(nullable NSString*)messageChannelSuffix{
+  self = [self init];
+  if (self) {
+    _binaryMessenger = binaryMessenger;
+    _messageChannelSuffix = [messageChannelSuffix length] == 0 ? @"" : [NSString stringWithFormat: @".%@", messageChannelSuffix];
+  }
+  return self;
+}
+- (void)disposeObjectWithIdentifier:(NSString *)arg_identifier completion:(void (^)(FlutterError *_Nullable))completion {
+  NSString *channelName = [NSString stringWithFormat:@"%@%@", @"dev.flutter.pigeon.flutter_instance_manager.NSObjectFlutterApi.dispose", _messageChannelSuffix];
+  FlutterBasicMessageChannel *channel =
+    [FlutterBasicMessageChannel
+      messageChannelWithName:channelName
+      binaryMessenger:self.binaryMessenger
+      codec:FLTNSObjectFlutterApiGetCodec()];
+  [channel sendMessage:@[arg_identifier ?: [NSNull null]] reply:^(NSArray<id> *reply) {
+    if (reply != nil) {
+      if (reply.count > 1) {
+        completion([FlutterError errorWithCode:reply[0] message:reply[1] details:reply[2]]);
+      } else {
+        completion(nil);
+      }
+    } else {
+      completion(createConnectionError(channelName));
+    } 
+  }];
+}
+@end
+