pkg/objc: more methods

pkg/objc/object.zig

@@ -7,6 +7,22 @@ pub const Object = struct {
     value: c.id,
 
     pub usingnamespace MsgSend(Object);
+
+    pub fn fromId(id: anytype) Object {
+        return .{ .value = @ptrCast(c.id, @alignCast(@alignOf(c.id), id)) };
+    }
+
+    /// Returns the class of an object.
+    pub fn getClass(self: Object) ?objc.Class {
+        return objc.Class{
+            .value = c.object_getClass(self.value) orelse return null,
+        };
+    }
+
+    /// Returns the class name of a given object.
+    pub fn getClassName(self: Object) [:0]const u8 {
+        return std.mem.sliceTo(c.object_getClassName(self.value), 0);
+    }
 };
 
 test {
@@ -16,5 +32,6 @@ test {
     // Should work with our wrappers
     const obj = NSObject.msgSend(objc.Object, objc.Sel.registerName("alloc"), .{});
     try testing.expect(obj.value != null);
+    try testing.expectEqualStrings("NSObject", obj.getClassName());
     obj.msgSend(void, objc.sel("dealloc"), .{});
 }