diff --git a/Cargo.lock b/Cargo.lock
index 941b526..47a8c56 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -150,7 +150,7 @@ dependencies = [
 
 [[package]]
 name = "app-surface"
-version = "0.4.2"
+version = "0.4.4"
 dependencies = [
  "android_logger",
  "ash",
diff --git a/app-surface/Cargo.toml b/app-surface/Cargo.toml
index 8e4a61e..68ac84e 100644
--- a/app-surface/Cargo.toml
+++ b/app-surface/Cargo.toml
@@ -3,7 +3,7 @@ name = "app-surface"
 authors = ["jinleili"]
 description = "Integrate wgpu into your existing iOS and Android apps."
 edition = "2021"
-version = "0.4.2"
+version = "0.4.4"
 rust-version = "1.76"
 repository = "https://github.com/jinleili/wgpu-in-app"
 keywords = ["android", "SurfaceView", "ios", "macos", "wgpu"]
diff --git a/app-surface/src/ios.rs b/app-surface/src/ios.rs
index e7b2485..21b4522 100644
--- a/app-surface/src/ios.rs
+++ b/app-surface/src/ios.rs
@@ -97,6 +97,19 @@ impl AppSurface {
 }
 
 fn get_scale_factor(obj: *mut Object) -> f32 {
-    let s: CGFloat = unsafe { msg_send![obj, contentScaleFactor] };
-    s as f32
+    let mut scale_factor: CGFloat = 1.0;
+    #[cfg(target_os = "macos")]
+    unsafe {
+        let window: *mut Object = msg_send![obj, window];
+        if !window.is_null() {
+            scale_factor = msg_send![window, backingScaleFactor];
+        }
+    };
+
+    #[cfg(target_os = "ios")]
+    {
+        scale_factor = unsafe { msg_send![obj, contentScaleFactor] };
+    }
+
+    scale_factor as f32
 }