pkg/objc: properties

pkg/objc/class.zig

@@ -14,6 +14,21 @@ pub const Class = struct {
             .value = c.objc_getClass(name.ptr) orelse return null,
         };
     }
+
+    /// Returns a property with a given name of a given class.
+    pub fn getProperty(self: Class, name: [:0]const u8) ?objc.Property {
+        return objc.Property{
+            .value = c.class_getProperty(self.value, name.ptr) orelse return null,
+        };
+    }
+
+    /// Describes the properties declared by a class. This must be freed.
+    pub fn copyPropertyList(self: Class) []objc.Property {
+        var count: c_uint = undefined;
+        const list = @ptrCast([*c]objc.Property, c.class_copyPropertyList(self.value, &count));
+        if (count == 0) return list[0..0];
+        return list[0..count];
+    }
 };
 
 test "getClass" {
@@ -40,3 +55,20 @@ test "msgSend" {
     try testing.expect(obj.value != null);
     obj.msgSend(void, objc.sel("dealloc"), .{});
 }
+
+test "getProperty" {
+    const testing = std.testing;
+    const NSObject = Class.getClass("NSObject").?;
+
+    try testing.expect(NSObject.getProperty("className") != null);
+    try testing.expect(NSObject.getProperty("nope") == null);
+}
+
+test "copyProperyList" {
+    const testing = std.testing;
+    const NSObject = Class.getClass("NSObject").?;
+
+    const list = NSObject.copyPropertyList();
+    defer objc.free(list);
+    try testing.expect(list.len > 20);
+}