iOS 预处理宏打包脚本编写

开发过程中遇到了一个需求，需要隐项目中VPN相关的代码，而是否隐藏需要在自动化打包时进行可选配置。需要用到条件编译，而条件编译的条件只能是常量，所以需要在打包时就把这个条件写进Xcode的配置项里面，这样才能变成常量。

iOS中条件编译时用到的常量可以使用预处理宏，在Xcode存放中存放的位置如图所示，我们只需要用脚本写入即可。

首先需要读取plist文件中在打包平台填写的VPN是否开启的常量值，然后把这个常量值写入预处理宏，用到了ruby脚本。

shell脚本部分代码：

#当前项目根目录
project_path=$(cd `dirname $0`; pwd)
echo "当前项目根目录=$project_path"

#进入当前目录
cd $project_path

# VPN
export openSXFVPN=`/usr/libexec/PlistBuddy -c "Print data:openSXFVpn" $project_path/config.plist`
if [ $openSXFVPN = "true" ] ;then
sed -i '' "s/gcc_arr.push(\'VPNOpen=.*\')/gcc_arr.push(\'VPNOpen=1\')/" $project_path/VPN.rb
else
sed -i '' "s/gcc_arr.push(\'VPNOpen=.*\')/gcc_arr.push(\'VPNOpen=0\')/" $project_path/VPN.rb
fi
ruby VPN.rb

VPN.rb:

require 'xcodeproj'

# 打开工程
project_path = './SWSuperApp.xcodeproj'
project = Xcodeproj::Project.open(project_path)

# 查询有多少个target
project.targets.each do |target|
    puts target.name
end

# 遍历配置
project.targets[0].build_configurations.each do |config|
    puts config.name
    build_settings = config.build_settings
    build_settings.each do |key, value|
        print key, " == ", value, "\n"
    end
end

# 找到需要操作的target，我这里只有一个target
target_index = 0
project.targets.each_with_index do |target, index|
    if target.name == "SWSuperApp"
        target_index = index
        puts target_index
    end
end
target = project.targets[target_index]

def check_repeat_element(gcc_preprocess, repeat_ele)
    if gcc_preprocess
        gcc_preprocess.each do |gcc|
            if gcc.start_with?(repeat_ele)
                return true
            end
        end
    end
    return false
end

def delete_repeat_element(gcc_preprocess, repeat_ele)
    if gcc_preprocess
        gcc_preprocess.each do |gcc|
            if gcc.start_with?(repeat_ele)
                gcc_preprocess.delete(gcc)
            end
        end
    end
end

build_config_preprocess = ''

# 遍历配置
target.build_configurations.each do |config|
    gcc_preprocess = config.build_settings['GCC_PREPROCESSOR_DEFINITIONS']
        gcc_arr = Array.new()

        if gcc_preprocess.is_a? String
            gcc_arr.push(gcc_preprocess);
        elsif gcc_preprocess.is_a? Array
            gcc_arr = gcc_preprocess
        end

        if check_repeat_element(gcc_arr, '$(inherited)')
             delete_repeat_element(gcc_arr, '$(inherited)')
        end
        
        if check_repeat_element(gcc_arr, 'VPNOpen')
             delete_repeat_element(gcc_arr, 'VPNOpen')
        end

        gcc_arr.push('$(inherited)')
        gcc_arr.push('VPNOpen=0')

        config.build_settings['GCC_PREPROCESSOR_DEFINITIONS'] = gcc_arr
        build_config_preprocess = gcc_arr
end

puts '修改编译配置完成 ' + build_config_preprocess.to_s

project.save