add viewMetrics

com.unity.uiwidgets/Runtime/engine/UIWidgetsMessageManager.cs

         }
 
 #if UNITY_IOS || UNITY_WEBGL        
-        //[DllImport("__Internal")]
-        //static extern void UIWidgetsMessageSetObjectName(string objectName);
+        [DllImport("__Internal")]
+        static extern void UIWidgetsMessageSetObjectName(string objectName);
 #elif UNITY_ANDROID
         
         static void UIWidgetsMessageSetObjectName(string objectName) {

com.unity.uiwidgets/Runtime/engine2/DisplayMetrics.cs

                         padding_bottom = padding_bottom
                     };
                 }
+#elif !UNITY_EDITOR && UNITY_IOS
+                viewMetrics metrics = IOSGetViewportPadding();
+                this._viewMetrics = metrics;
 #else
                 _viewMetrics = new viewMetrics {
                     insets_bottom = 0,
         [DllImport("__Internal")]
         static extern float IOSDeviceScaleFactor();
 
-//         [DllImport(“__Internal”)]
-//         static extern viewMetrics IOSGetViewportPadding();
+        [DllImport("__Internal")]
+        static extern viewMetrics IOSGetViewportPadding();
 #endif
 
     }

engine/Build.bee.cs

                 "src/shell/platform/unity/darwin/ios/device_screen.mm",
                 "src/shell/platform/unity/darwin/ios/uiwidgets_device.mm",
                 "src/shell/platform/unity/darwin/ios/uiwidgets_device.h",
+                "src/shell/platform/unity/darwin/ios/uiwidgets_message_manager.h",
+                "src/shell/platform/unity/darwin/ios/uiwidgets_message_manager.mm",
+                "src/shell/platform/unity/darwin/ios/uiwidgets_text_input_delegate.h",
+                "src/shell/platform/unity/darwin/ios/uiwidgets_view_controller.h",
+                "src/shell/platform/unity/darwin/ios/uiwidgets_view_controller.mm",
         };
 
         np.Sources.Add(c => IsWindows(c), winSources);

engine/src/shell/platform/unity/darwin/ios/uiwidgets_message_manager.h

+#ifndef PLATFORM_IOS_FRAMEWORK_SOURCE_UIWIDGETSMESSAGEMANAGER_H_
+#define PLATFORM_IOS_FRAMEWORK_SOURCE_UIWIDGETSMESSAGEMANAGER_H_
+#import <UIKit/UIKit.h>
+
+void UIWidgetsMethodMessage(NSString* channel, NSString* method, NSArray *args);
+
+#endif

engine/src/shell/platform/unity/darwin/ios/uiwidgets_message_manager.mm

+#include "uiwidgets_message_manager.h"
+#include "runtime/mono_api.h"
+
+#define MAX_OBJECT_NAME_LENGTH 256
+static char uiwidgetsMessageObjectName[MAX_OBJECT_NAME_LENGTH] = {0};
+
+static char* MakeStringCopy (const char* string)
+{
+    if (string == NULL)
+        return NULL;
+    
+    char* res = (char*)malloc(strlen(string) + 1);
+    strcpy(res, string);
+    return res;
+}
+
+void UIWidgetsMethodMessage(NSString* channel, NSString* method, NSArray *args)
+{
+    // const char* msg = NULL;
+    // NSError *error;
+    // NSDictionary* dict = @{
+    //                     @"channel": channel,
+    //                     @"method": method,
+    //                     @"args": args
+    //                     };
+
+    // NSData* data = [NSJSONSerialization dataWithJSONObject:dict options:0 error:&error];
+    // NSString* text = [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease];
+    // msg = [text UTF8String];
+    
+    // UnitySendMessage(uiwidgetsMessageObjectName, "OnUIWidgetsMethodMessage", msg);
+}
+
+UIWIDGETS_API(void) UIWidgetsMessageSetObjectName(const char* name){
+    strlcpy(uiwidgetsMessageObjectName, name, MAX_OBJECT_NAME_LENGTH);
+}
+

engine/src/shell/platform/unity/darwin/ios/uiwidgets_text_input_delegate.h

+#ifndef PLATFORM_IOS_FRAMEWORK_SOURCE_UIWIDGETSTEXTINPUTDELEGATE_H_
+#define PLATFORM_IOS_FRAMEWORK_SOURCE_UIWIDGETSTEXTINPUTDELEGATE_H_
+#import <Foundation/Foundation.h>
+
+typedef NS_ENUM(NSInteger, UIWidgetsTextInputAction) {
+    UIWidgetsTextInputActionUnspecified,
+    UIWidgetsTextInputActionDone,
+    UIWidgetsTextInputActionGo,
+    UIWidgetsTextInputActionSend,
+    UIWidgetsTextInputActionSearch,
+    UIWidgetsTextInputActionNext,
+    UIWidgetsTextInputActionContinue,
+    UIWidgetsTextInputActionJoin,
+    UIWidgetsTextInputActionRoute,
+    UIWidgetsTextInputActionEmergencyCall,
+    UIWidgetsTextInputActionNewline,
+};
+
+@protocol UIWidgetsTextInputDelegate <NSObject>
+
+- (void)updateEditingClient:(int)client withState:(NSDictionary*)state;
+- (void)performAction:(UIWidgetsTextInputAction)action withClient:(int)client;
+
+@end
+
+
+@interface DefaultUIWidgetsTextInputDelegate : NSObject <UIWidgetsTextInputDelegate>
+- (void)updateEditingClient:(int)client withState:(NSDictionary*)state;
+- (void)performAction:(UIWidgetsTextInputAction)action withClient:(int)client;
+@end
+
+#endif

engine/src/shell/platform/unity/darwin/ios/uiwidgets_view_controller.h

+#ifndef PLATFORM_IOS_FRAMEWORK_SOURCE_UIWIDGETSVIEWCONTROLLER_H_
+#define PLATFORM_IOS_FRAMEWORK_SOURCE_UIWIDGETSVIEWCONTROLLER_H_
+
+#import <UIKit/UIKit.h>
+#include "uiwidgets_text_input_delegate.h"
+
+struct viewPadding
+{
+    float top;
+    float bottom;
+    float left;
+    float right;
+};
+
+struct viewMetrics
+{
+    float insets_top;
+    float insets_bottom;
+    float insets_left;
+    float insets_right;
+    
+    float padding_top;
+    float padding_bottom;
+    float padding_left;
+    float padding_right;
+};
+
+@interface UIWidgetsViewController : NSObject
+@property viewPadding padding;
+@property viewPadding viewInsets;
+@end
+
+#endif

engine/src/shell/platform/unity/darwin/ios/uiwidgets_view_controller.mm

+#include "uiwidgets_view_controller.h"
+#include "uiwidgets_message_manager.h"
+#include "uiwidgets_device.h"
+#include "runtime/mono_api.h"
+#include <Foundation/Foundation.h>
+#include <UIKit/UIKit.h>
+
+@implementation UIWidgetsViewController {
+}
+
+@synthesize viewInsets;
+@synthesize padding;
+
+- (instancetype)init {
+    self = [super init];
+    if (self) {
+        viewInsets.bottom = 0;
+        viewInsets.top = 0;
+        viewInsets.left = 0;
+        viewInsets.right = 0;
+
+        CGFloat scale = [[UIScreen mainScreen] scale];
+        if (@available(iOS 11, *)) {
+            padding.bottom = [UIApplication sharedApplication].keyWindow.safeAreaInsets.bottom * scale;
+            padding.top = [UIApplication sharedApplication].keyWindow.safeAreaInsets.top * scale;
+            padding.left = [UIApplication sharedApplication].keyWindow.safeAreaInsets.left * scale;
+            padding.right = [UIApplication sharedApplication].keyWindow.safeAreaInsets.right * scale;
+        } else {
+            CGRect statusFrame = [UIApplication sharedApplication].statusBarFrame;
+            padding.bottom = 0;
+            padding.top = statusFrame.size.height * scale;
+            padding.left = 0;
+            padding.right = 0;
+        }
+
+        NSNotificationCenter* center = [NSNotificationCenter defaultCenter];
+        [center addObserver:self
+                   selector:@selector(keyboardWillChangeFrame:)
+                       name:UIKeyboardWillChangeFrameNotification
+                     object:nil];
+        [center addObserver:self
+                   selector:@selector(keyboardWillBeHidden:)
+                       name:UIKeyboardWillHideNotification
+                     object:nil];
+    }
+
+    return self;
+}
+
+-(void)keyboardWillBeHidden:(NSNotification*)notification {
+    viewInsets.bottom = 0;
+    CGFloat scale = [UIScreen mainScreen].scale;
+    if (@available(iOS 11, *)) {
+        CGFloat cur_padding = [UIApplication sharedApplication].keyWindow.safeAreaInsets.bottom * scale;
+        padding.bottom = cur_padding;
+    } else {
+        CGRect statusFrame = [UIApplication sharedApplication].statusBarFrame;
+        CGFloat cur_padding = statusFrame.size.height * scale;
+        padding.top = cur_padding;
+    }
+
+    UIWidgetsMethodMessage(@"ViewportMatricsChanged", @"UIWidgetViewController.keyboardChanged", @[]);
+}
+
+-(void)keyboardWillChangeFrame:(NSNotification*)notification {
+    NSDictionary* info = [notification userInfo];
+    CGFloat bottom = CGRectGetHeight([[info objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue]);
+    CGFloat scale = [UIScreen mainScreen].scale;
+
+    viewInsets.bottom = bottom * scale;
+    padding.bottom = 0;
+
+    UIWidgetsMethodMessage(@"ViewportMatricsChanged", @"UIWidgetViewController.keyboardChanged", @[]);
+}
+
+-(void)tryLaunch {
+
+}
+
++ (instancetype)sharedInstance {
+    static UIWidgetsViewController *sharedInstance = nil;
+    static dispatch_once_t onceToken;
+
+    dispatch_once(&onceToken, ^{
+        sharedInstance = [[UIWidgetsViewController alloc] init];
+    });
+    return sharedInstance;
+}
+
+@end
+
+
+UIWIDGETS_API(viewMetrics) IOSGetViewportPadding()
+{
+    viewMetrics metrics;
+    viewPadding insets = [[UIWidgetsViewController sharedInstance] viewInsets];
+    viewPadding padding = [[UIWidgetsViewController sharedInstance] padding];
+
+    BOOL needDownsample = [UIWidgetsDevice NeedScreenDownSample];
+
+    metrics.insets_bottom = needDownsample ? insets.bottom * 0.8696 : insets.bottom;
+    metrics.insets_top = needDownsample ? insets.top * 0.8696 : insets.top;
+    metrics.insets_left = needDownsample ? insets.left * 0.8696 : insets.left;
+    metrics.insets_right = needDownsample ? insets.right * 0.8696 : insets.right;
+    metrics.padding_bottom = needDownsample ? padding.bottom * 0.8696 : padding.bottom;
+    metrics.padding_top = needDownsample ? padding.top * 0.8696 : padding.top;
+    metrics.padding_left = needDownsample ? padding.left * 0.8696 : padding.left;
+    metrics.padding_right = needDownsample ? padding.right * 0.8696 : padding.right;
+
+    return metrics;
+}
+