[camera] Fixes crash when taking a picture on iOS devices without flash (flutter#3411)

Author: mvanbeusekom

packages/camera/camera/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.7.0+5
+
+* Fixes crash when taking a picture on iOS devices without flash.
+
 ## 0.7.0+4
 
 * Make sure the configured zoom scale is copied over to the final capture builder on Android. Fixes the issue where the preview is zoomed but the final picture is not.

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

@@ -365,12 +365,12 @@ - (instancetype)initWithCameraName:(NSString *)cameraName
   _enableAudio = enableAudio;
   _dispatchQueue = dispatchQueue;
   _captureSession = [[AVCaptureSession alloc] init];
-  _flashMode = FlashModeAuto;
+  _captureDevice = [AVCaptureDevice deviceWithUniqueID:cameraName];
+  _flashMode = _captureDevice.hasFlash ? FlashModeAuto : FlashModeOff;
   _exposureMode = ExposureModeAuto;
   _focusMode = FocusModeAuto;
   _lockedCaptureOrientation = UIDeviceOrientationUnknown;
 
-  _captureDevice = [AVCaptureDevice deviceWithUniqueID:cameraName];
   NSError *localError = nil;
   _captureVideoInput = [AVCaptureDeviceInput deviceInputWithDevice:_captureDevice
                                                              error:&localError];

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: 0.7.0+4
+version: 0.7.0+5
 homepage: https://github.com/flutter/plugins/tree/master/packages/camera/camera
 
 dependencies: