设置最低iOS版本 9.3

ios/Runner.xcodeproj/project.pbxproj

@@ -402,7 +402,7 @@
 					"$(PROJECT_DIR)/Flutter",
 				);
 				INFOPLIST_FILE = Runner/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 12.1;
+				IPHONEOS_DEPLOYMENT_TARGET = 9.3;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -539,7 +539,7 @@
 					"$(PROJECT_DIR)/Flutter",
 				);
 				INFOPLIST_FILE = Runner/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 12.1;
+				IPHONEOS_DEPLOYMENT_TARGET = 9.3;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -577,7 +577,7 @@
 					"$(PROJECT_DIR)/Flutter",
 				);
 				INFOPLIST_FILE = Runner/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 12.1;
+				IPHONEOS_DEPLOYMENT_TARGET = 9.3;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",