修改podfile，解决libarclite_iphoneos.a依赖问题。

Podfile

@@ -1,6 +1,17 @@
 # Uncomment the next line to define a global platform for your project
 # platform :ios, '9.0'
 
+platform :ios, '13.4'
+source 'https://github.com/CocoaPods/Specs.git' # download from github，not cdn
+post_install do |installer|
+    installer.generated_projects.each do |project|
+        project.targets.each do |target|
+            target.build_configurations.each do |config|
+                config.build_settings['IPHONEOS_DEPLOYMENT_TARGET'] = '13.0'
+            end
+        end
+    end
+end
 target 'AIGrammar' do
   # Comment the next line if you don't want to use dynamic frameworks
   use_frameworks!