[camera] Solves delay when using the zoom feature on iOS. (flutter#3562)

Author: mvanbeusekom

packages/camera/camera/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.8.0-nullsafety.2
+
+* Solved delay when using the zoom feature on iOS.
+
 ## 0.8.0-nullsafety.1
 
 * Added a timeout to the pre-capture sequence on Android to prevent crashes when the camera cannot get a focus.

packages/camera/camera/ios/Classes/CameraPlugin.m

@@ -1068,7 +1068,7 @@ - (void)setZoomLevel:(CGFloat)zoom Result:(FlutterResult)result {
     result(getFlutterError(error));
     return;
   }
-  [_captureDevice rampToVideoZoomFactor:zoom withRate:1];
+  _captureDevice.videoZoomFactor = zoom;
   [_captureDevice unlockForConfiguration];
 
   result(nil);

packages/camera/camera/pubspec.yaml

@@ -2,7 +2,7 @@ name: camera
 description: A Flutter plugin for getting information about and controlling the
   camera on Android and iOS. Supports previewing the camera feed, capturing images, capturing video,
   and streaming image buffers to dart.
-version: 0.8.0-nullsafety.1
+version: 0.8.0-nullsafety.2
 homepage: https://github.com/flutter/plugins/tree/master/packages/camera/camera
 
 dependencies: