Add iOS platform (refactor Mac into shared Apple platform impl)

Source/Engine/Platform/iOS/iOSPlatform.cpp

@@ -0,0 +1,91 @@
+// Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
+
+#if PLATFORM_IOS
+
+#include "iOSPlatform.h"
+#include "iOSWindow.h"
+#include "Engine/Core/Log.h"
+#include "Engine/Core/Types/String.h"
+#include "Engine/Platform/StringUtils.h"
+#include "Engine/Platform/MessageBox.h"
+#include <UIKit/UIKit.h>
+#include <sys/utsname.h>
+
+int32 Dpi = 96;
+Guid DeviceId;
+
+DialogResult MessageBox::Show(Window* parent, const StringView& text, const StringView& caption, MessageBoxButtons buttons, MessageBoxIcon icon)
+{
+    // TODO: implement message box popup on iOS
+    return DialogResult::OK;
+}
+
+bool iOSPlatform::Init()
+{
+    if (ApplePlatform::Init())
+        return true;
+
+    ScreenScale = [[UIScreen mainScreen] scale];
+    CustomDpiScale *= ScreenScale;
+    Dpi = 72; // TODO: calculate screen dpi (probably hardcoded map for iPhone model)
+
+    return false;
+}
+
+void iOSPlatform::LogInfo()
+{
+    ApplePlatform::LogInfo();
+
+	struct utsname systemInfo;
+	uname(&systemInfo);
+    NSOperatingSystemVersion version = [[NSProcessInfo processInfo] operatingSystemVersion];
+    LOG(Info, "{3}, iOS {0}.{1}.{2}", version.majorVersion, version.minorVersion, version.patchVersion, String(systemInfo.machine));
+}
+
+void iOSPlatform::Tick()
+{
+    // Process system events
+	while (CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0.0001, true) == kCFRunLoopRunHandledSource)
+    {
+    }
+}
+
+int32 iOSPlatform::GetDpi()
+{
+    return Dpi;
+}
+
+Guid iOSPlatform::GetUniqueDeviceId()
+{
+    return Guid::Empty; // TODO: use MAC address of the iPhone to generate device id (at least within network connection state)
+}
+
+String iOSPlatform::GetComputerName()
+{
+    return TEXT("iPhone");
+}
+
+Float2 iOSPlatform::GetDesktopSize()
+{
+    CGRect frame = [[UIScreen mainScreen] bounds];
+	float scale = [[UIScreen mainScreen] scale];
+    return Float2((float)frame.size.width * scale, (float)frame.size.height * scale);
+}
+
+String iOSPlatform::GetMainDirectory()
+{
+    String path = StringUtils::GetDirectoryName(GetExecutableFilePath());
+    if (path.EndsWith(TEXT("/Contents/iOS")))
+    {
+        // If running from executable in a package, go up to the Contents
+        path = StringUtils::GetDirectoryName(path);
+    }
+    return path;
+}
+
+Window* iOSPlatform::CreateWindow(const CreateWindowSettings& settings)
+{
+    return New<iOSWindow>(settings);
+}
+
+#endif