hyzp_ybqx-Commit154：使用自定义 my_flutter_drag_scale 插件，完美解决Listview滚动与图片缩放拖动之间的手势冲突，不会消耗点击事件，滚动很灵敏

lib/my_flutter_drag_scale/ios/Classes/FlutterDragScalePlugin.h

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+#import <Flutter/Flutter.h>
+
+@interface FlutterDragScalePlugin : NSObject<FlutterPlugin>
+@end

lib/my_flutter_drag_scale/ios/Classes/FlutterDragScalePlugin.m

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+#import "FlutterDragScalePlugin.h"
+
+@implementation FlutterDragScalePlugin
++ (void)registerWithRegistrar:(NSObject<FlutterPluginRegistrar>*)registrar {
+  FlutterMethodChannel* channel = [FlutterMethodChannel
+      methodChannelWithName:@"flutter_drag_scale"
+            binaryMessenger:[registrar messenger]];
+  FlutterDragScalePlugin* instance = [[FlutterDragScalePlugin alloc] init];
+  [registrar addMethodCallDelegate:instance channel:channel];
+}
+
+- (void)handleMethodCall:(FlutterMethodCall*)call result:(FlutterResult)result {
+  if ([@"getPlatformVersion" isEqualToString:call.method]) {
+    result([@"iOS " stringByAppendingString:[[UIDevice currentDevice] systemVersion]]);
+  } else {
+    result(FlutterMethodNotImplemented);
+  }
+}
+
+@end

lib/my_flutter_drag_scale/ios/flutter_drag_scale.podspec

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+#
+# To learn more about a Podspec see http://guides.cocoapods.org/syntax/podspec.html
+#
+Pod::Spec.new do |s|
+  s.name             = 'flutter_drag_scale'
+  s.version          = '0.0.1'
+  s.summary          = 'A new flutter plugin project.'
+  s.description      = <<-DESC
+A new flutter plugin project.
+                       DESC
+  s.homepage         = 'http://example.com'
+  s.license          = { :file => '../LICENSE' }
+  s.author           = { 'Your Company' => 'email@example.com' }
+  s.source           = { :path => '.' }
+  s.source_files = 'Classes/**/*'
+  s.public_header_files = 'Classes/**/*.h'
+  s.dependency 'Flutter'
+
+  s.ios.deployment_target = '8.0'
+end
+