iOS: implement keyboard plugin

doric-iOS/Pod/Classes/DoricRegistry.m

@@ -53,6 +53,7 @@
 #import "DoricSwitchNode.h"
 #import "DoricNotchPlugin.h"
 #import "DoricFlexNode.h"
+#import "DoricKeyboardPlugin.h"
 
 @interface DoricLibraries : NSObject
 @property(nonatomic, strong) NSMutableSet <DoricLibrary *> *libraries;
@@ -119,6 +120,7 @@ - (void)innerRegister {
     [self registerNativePlugin:DoricPopoverPlugin.class withName:@"popover"];
     [self registerNativePlugin:DoricAnimatePlugin.class withName:@"animate"];
     [self registerNativePlugin:DoricNotificationPlugin.class withName:@"notification"];
+    [self registerNativePlugin:DoricKeyboardPlugin.class withName:@"keyboard"];
     [self registerNativePlugin:DoricStatusBarPlugin.class withName:@"statusbar"];
     [self registerNativePlugin:DoricCoordinatorPlugin.class withName:@"coordinator"];
     [self registerNativePlugin:DoricNotchPlugin.class withName:@"notch"];

doric-iOS/Pod/Classes/Plugin/DoricKeyboardPlugin.h

@@ -0,0 +1,24 @@
+/*
+ * Copyright [2019] [Doric.Pub]
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+//
+// Created by jingpeng.wang on 2021/3/18.
+//
+
+#import <Foundation/Foundation.h>
+#import "DoricNativePlugin.h"
+
+@interface DoricKeyboardPlugin : DoricNativePlugin
+@end

doric-iOS/Pod/Classes/Plugin/DoricKeyboardPlugin.m

@@ -0,0 +1,83 @@
+/*
+ * Copyright [2019] [Doric.Pub]
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+//
+// Created by jingpeng.wang on 2021/3/18.
+//
+
+#import <DoricCore/Doric.h>
+#import "DoricKeyboardPlugin.h"
+
+@interface DoricKeyboardPlugin ()
+
+@property(nonatomic, copy) NSDictionary<NSString *, id> *observers;
+@end
+
+@implementation DoricKeyboardPlugin
+
+- (NSDictionary *)observers {
+    if (!_observers) {
+        _observers = [NSDictionary new];
+    }
+    return _observers;
+}
+
+- (void)subscribe:(NSString *)callbackId withPromise:(DoricPromise *)promise {
+    __weak typeof(self) _self = self;
+    id observer = [[NSNotificationCenter defaultCenter]
+            addObserverForName:UIKeyboardWillChangeFrameNotification
+                        object:nil
+                         queue:[NSOperationQueue mainQueue]
+                    usingBlock:^(NSNotification *note) {
+        __strong typeof(_self) self = _self;
+
+        CGRect beginFrame = [[note.userInfo valueForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue];
+        CGRect endFrame = [[note.userInfo valueForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
+
+        BOOL isOpen = endFrame.origin.y < beginFrame.origin.y;
+        int heightDiff = isOpen ? beginFrame.origin.y - endFrame.origin.y : 0;
+        
+        NSDictionary *dict = @{
+            @"height": @(heightDiff),
+        };
+
+        DoricPromise *currentPromise = [[DoricPromise alloc] initWithContext:self.doricContext callbackId:callbackId];
+        [currentPromise resolve:dict];
+    }];
+    NSMutableDictionary *mutableDictionary = [self.observers mutableCopy];
+    mutableDictionary[callbackId] = observer;
+    self.observers = mutableDictionary;
+    [promise resolve:callbackId];
+}
+
+- (void)unsubscribe:(NSString *)subscribeId withPromise:(DoricPromise *)promise {
+    id observer = self.observers[subscribeId];
+    if (observer) {
+        [[NSNotificationCenter defaultCenter] removeObserver:observer];
+        NSMutableDictionary *mutableDictionary = [self.observers mutableCopy];
+        [mutableDictionary removeObjectForKey:subscribeId];
+        self.observers = mutableDictionary;
+    }
+    [promise resolve:nil];
+}
+
+- (void)dealloc {
+    NSDictionary *dictionary = self.observers;
+    [dictionary enumerateKeysAndObjectsUsingBlock:^(NSString *key, id obj, BOOL *stop) {
+        [[NSNotificationCenter defaultCenter] removeObserver:obj];
+    }];
+}
+
+@end