如果你的package中的example iOS默认使用的语言是swift, 现在你想把它切换为Objective-C,那就来看看这篇文章吧.
前提:拷贝一份 package工程 出来.
1. 删除掉 example 中 ios 文件夹.
只需要删除 ios 文件夹, 其他不要动.
2. 在工程根目录下,使用objc语言重新创建iOS工程
flutter create -i objc example
3.修改 podfile
platform :ios, '9.0' #打开这行注释
source 'https://github.com/CocoaPods/Specs.git' #添加需要的source源
4. pod install
cd example/ios
pod install
不出意外的话, example已经可以跑起来了.
可能遇到的错误
1.有关swift
:-1:Couldnotfind auto-linked library'swiftCoreFoundation'
:-1:Couldnotfind auto-linked library'swiftSwiftOnoneSupport'
:-1:Couldnotfind auto-linked library'swiftCore'
:-1:Couldnotfind auto-linked library'swiftQuartzCore'
:-1:Couldnotfind auto-linked library'swiftCoreGraphics'
:-1:Couldnotfind auto-linked library'swiftUIKit'
:-1:Couldnotfind auto-linked library'swiftDarwin'
:-1:Couldnotfind auto-linked library'swiftFoundation'
:-1:Couldnotfind auto-linked library'swiftsimd'
:-1:Couldnotfind auto-linked library'swiftObjectiveC'
:-1:Couldnotfind auto-linked library'swiftMetal'
:-1:Couldnotfind auto-linked library'swiftDispatch'
:-1:Couldnotfind auto-linked library'swiftCoreMedia'
:-1:Couldnotfind auto-linked library'swiftAVFoundation'
:-1:Couldnotfind auto-linked library'swiftCoreImage'
:-1:Couldnotfind auto-linked library'swiftCoreAudio'
解决办法:
在Runner文件夹右键，新建一个空白swift 文件, 文件名随意. (swift文件和AppDelegate同级)
点击创建的时候Xcode会提示 Create Bridging Header , 点击生成 Bridging Header文件就ok了,
重新 build工程
podfile参考如下:
# Uncomment this line to define a global platform for your project
source 'https://github.com/CocoaPods/Specs.git'
platform :ios, '9.0'
# CocoaPods analytics sends network stats synchronously affecting flutter build latency.
ENV['COCOAPODS_DISABLE_STATS'] = 'true'
project 'Runner', {
'Debug' => :debug,
'Profile' => :release,
'Release' => :release,
}
def parse_KV_file(file, separator='=')
file_abs_path = File.expand_path(file)
if !File.exists? file_abs_path
return [];
end
generated_key_values = {}
skip_line_start_symbols = ["#", "/"]
File.foreach(file_abs_path) do |line|
next if skip_line_start_symbols.any? { |symbol| line =~ /^\s*#{symbol}/ }
plugin = line.split(pattern=separator)
if plugin.length == 2
podname = plugin[0].strip()
path = plugin[1].strip()
podpath = File.expand_path("#{path}", file_abs_path)
generated_key_values[podname] = podpath
else
puts "Invalid plugin specification: #{line}"
end
end
generated_key_values
end
target 'Runner' do
# Flutter Pod
copied_flutter_dir = File.join(__dir__, 'Flutter')
copied_framework_path = File.join(copied_flutter_dir, 'Flutter.framework')
copied_podspec_path = File.join(copied_flutter_dir, 'Flutter.podspec')
unless File.exist?(copied_framework_path) && File.exist?(copied_podspec_path)
# Copy Flutter.framework and Flutter.podspec to Flutter/ to have something to link against if the xcode backend script has not run yet.
# That script will copy the correct debug/profile/release version of the framework based on the currently selected Xcode configuration.
# CocoaPods will not embed the framework on pod install (before any build phases can generate) if the dylib does not exist.
generated_xcode_build_settings_path = File.join(copied_flutter_dir, 'Generated.xcconfig')
unless File.exist?(generated_xcode_build_settings_path)
raise "Generated.xcconfig must exist. If you're running pod install manually, make sure flutter pub get is executed first"
end
generated_xcode_build_settings = parse_KV_file(generated_xcode_build_settings_path)
cached_framework_dir = generated_xcode_build_settings['FLUTTER_FRAMEWORK_DIR'];
unless File.exist?(copied_framework_path)
FileUtils.cp_r(File.join(cached_framework_dir, 'Flutter.framework'), copied_flutter_dir)
end
unless File.exist?(copied_podspec_path)
FileUtils.cp(File.join(cached_framework_dir, 'Flutter.podspec'), copied_flutter_dir)
end
end
# Keep pod path relative so it can be checked into Podfile.lock.
pod 'Flutter', :path => 'Flutter'
# Plugin Pods
# Prepare symlinks folder. We use symlinks to avoid having Podfile.lock
# referring to absolute paths on developers' machines.
system('rm -rf .symlinks')
system('mkdir -p .symlinks/plugins')
plugin_pods = parse_KV_file('../.flutter-plugins')
plugin_pods.each do |name, path|
symlink = File.join('.symlinks', 'plugins', name)
File.symlink(path, symlink)
pod name, :path => File.join(symlink, 'ios')
end
end
post_install do |installer|
installer.pods_project.targets.each do |target|
target.build_configurations.each do |config|
config.build_settings['ENABLE_BITCODE'] = 'NO'
end
end
end