多target配置Podfile

方式一：
platform :ios, '10.0'

install! 'cocoapods',
         :warn_for_unused_master_specs_repo => false

target :DemoA do
  use_frameworks!
end

target 'DemoB' do
  use_frameworks!
  pod 'AFNetworking'
end

方式二：
platform :ios, '10.0'

install! 'cocoapods',
         :warn_for_unused_master_specs_repo => false

targetArray = ['DemoA', 'DemoB']
targetArray.each do |t|
  target t do
    use_frameworks!
    pod 'AFNetworking'
  end
end

方式三：
platform :ios, '10.0'

install! 'cocoapods',
         :warn_for_unused_master_specs_repo => false

def demo
  pod 'AFNetworking'
  pod 'MJRefresh'
end

target :DemoA do
  demo
end

target :DemoB do
  demo
  pod 'MJExtension'
end