apprt/embedded: add iOS platform with uivew

include/ghostty.h

@@ -33,6 +33,7 @@ typedef void *ghostty_inspector_t;
 typedef enum {
     GHOSTTY_PLATFORM_INVALID,
     GHOSTTY_PLATFORM_MACOS,
+    GHOSTTY_PLATFORM_IOS,
 } ghostty_platform_e;
 
 typedef enum {
@@ -358,8 +359,13 @@ typedef struct {
     void *nsview;
 } ghostty_platform_macos_s;
 
+typedef struct {
+    void *uiview;
+} ghostty_platform_ios_s;
+
 typedef union {
     ghostty_platform_macos_s macos;
+    ghostty_platform_ios_s ios;
 } ghostty_platform_u;
 
 typedef struct {

src/apprt/embedded.zig

@@ -234,6 +234,7 @@ pub const App = struct {
 /// Platform-specific configuration for libghostty.
 pub const Platform = union(PlatformTag) {
     macos: MacOS,
+    ios: IOS,
 
     // If our build target for libghostty is not darwin then we do
     // not include macos support at all.
@@ -242,12 +243,21 @@ pub const Platform = union(PlatformTag) {
         nsview: objc.Object,
     } else void;
 
+    pub const IOS = if (builtin.target.isDarwin()) struct {
+        /// The view to render the surface on.
+        uiview: objc.Object,
+    } else void;
+
     // The C ABI compatible version of this union. The tag is expected
     // to be stored elsewhere.
     pub const C = extern union {
         macos: extern struct {
             nsview: ?*anyopaque,
         },
+
+        ios: extern struct {
+            uiview: ?*anyopaque,
+        },
     };
 
     /// Initialize a Platform a tag and configuration from the C ABI.
@@ -260,6 +270,13 @@ pub const Platform = union(PlatformTag) {
                     break :macos error.NSViewMustBeSet);
                 break :macos .{ .macos = .{ .nsview = nsview } };
             } else error.UnsupportedPlatform,
+
+            .ios => if (IOS != void) ios: {
+                const config = c_platform.ios;
+                const uiview = objc.Object.fromId(config.uiview orelse
+                    break :ios error.UIViewMustBeSet);
+                break :ios .{ .ios = .{ .uiview = uiview } };
+            } else error.UnsupportedPlatform,
         };
     }
 };
@@ -269,6 +286,7 @@ pub const PlatformTag = enum(c_int) {
     // from the C API.
 
     macos = 1,
+    ios = 2,
 };
 
 pub const Surface = struct {

src/renderer/Metal.zig

@@ -468,6 +468,7 @@ pub fn finalizeSurfaceInit(self: *const Metal, surface: *apprt.Surface) !void {
         apprt.embedded => .{
             .view = switch (surface.platform) {
                 .macos => |v| v.nsview,
+                .ios => |v| v.uiview,
             },
             .scaleFactor = @floatCast(surface.content_scale.x),
         },