XCode12制作Swift和OC混编静态库

在本篇文章中主要来记录使用Xcode12来制作静态库的过程，及出现的问题。静态库分为两种.framework文件和.a文件，在本文中，我们以.framework为例。

制作静态库

1，新建framework工程，Language一栏我们选择Objective-C。

framework.png

2，在工程中分别新建一个OC类和Swift类

OC类： LYPerson:

@interface LYPerson : NSObject

+ (void) run;
@end
#import "LYPerson.h"

@implementation LYPerson

+(void)run {
    NSLog(@"正在跑步......");
}
@end

Swift类：Calculator

import Foundation

public class Calculator {
    
    public static func add(_ sum1: Int, _ sum2: Int) -> Int {
        return sum1 + sum2;
    }
}

swift class需要指定类为 public class，其方法也应为public，才可以被外界引用。
OC class 需要将暴露给外界使用的类设置为public

OC类设置为public.jpg
将暴露的OC类倒入库的头文件LYKitDemo中

//! Project version number for LYKitDemo.
FOUNDATION_EXPORT double LYKitDemoVersionNumber;

//! Project version string for LYKitDemo.
FOUNDATION_EXPORT const unsigned char LYKitDemoVersionString[];

// In this header, you should import all the public headers of your framework using statements like #import <LYKitDemo/PublicHeader.h>

#import "LYPerson.h"

整体目录结构如下

整体结构.jpg

3，将项目的Build Configuration设置为 Release

BuildConfiguration.jpg

4，编译 simulator静态库
选择任意一个模拟器，按下 command + B进行编译，编译成功后，在 Finder 中查看 LYKitDemo.framework。

模拟器.jpg

5，查看 framework支持的架构

lipo -info /Users/admin/Library/Developer/Xcode/DerivedData/LYKitDemo-anioropnglgdfcdumxqlsqwhnusk/Build/Products/Release-iphonesimulator/LYKitDemo.framework/LYKitDemo

结果如下

Architectures in the fat file: /Users/admin/Library/Developer/Xcode/DerivedData/LYKitDemo-anioropnglgdfcdumxqlsqwhnusk/Build/Products/Release-iphonesimulator/LYKitDemo.framework/LYKitDemo are: i386 x86_64 arm64

在 Xcode12，通过模拟器编译出来的静态库支持i386，x86_64，arm64架构。

6，编译真机静态库，选择Any iOS Device，按照步骤4中的步骤，在操作一边。并查看

真机静态库.jpg

同样使用lipo -info命令查看其支持的架构

 admin@localhost  ~/Desktop  lipo -info /Users/admin/Library/Developer/Xcode/DerivedData/LYKitDemo-anioropnglgdfcdumxqlsqwhnusk/Build/Products/Release-iphoneos/LYKitDemo.framework/LYKitDemo
Architectures in the fat file: /Users/admin/Library/Developer/Xcode/DerivedData/LYKitDemo-anioropnglgdfcdumxqlsqwhnusk/Build/Products/Release-iphoneos/LYKitDemo.framework/LYKitDemo are: armv7 arm64

用真机编译出来的静态库，支持armv7 和 arm64架构。

7，将 模拟器和真机下的静态库进行合并
使用：lipo -create 静态库1的地址静态库2的地址 -output 输出路径

 admin@localhost  ~/Desktop  lipo -create "/Users/admin/Library/Developer/Xcode/DerivedData/LYKitDemo-anioropnglgdfcdumxqlsqwhnusk/Build/Products/Release-iphoneos/LYKitDemo.framework/LYKitDemo" "/Users/admin/Library/Developer/Xcode/DerivedData/LYKitDemo-anioropnglgdfcdumxqlsqwhnusk/Build/Products/Release-iphonesimulator/LYKitDemo.framework/LYKitDemo" -output "/Users/admin/Desktop/IPA包/LYKitDemo"
fatal error: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/lipo: /Users/admin/Library/Developer/Xcode/DerivedData/LYKitDemo-anioropnglgdfcdumxqlsqwhnusk/Build/Products/Release-iphoneos/LYKitDemo.framework/LYKitDemo and /Users/admin/Library/Developer/Xcode/DerivedData/LYKitDemo-anioropnglgdfcdumxqlsqwhnusk/Build/Products/Release-iphonesimulator/LYKitDemo.framework/LYKitDemo have the same architectures (arm64) and can't be in the same fat output file

在合并的时候发生了错误❌have the same architectures (arm64) and can't be in the same fat output file，是因为两个文件都支持arm64架构，我们需要重新编译一个不包含 arm64架构的模拟器静态库。

我们修改 Build Setting 中的 Excluded Architectures选项，将其值变为arm64。

模拟器下去除arm64架构.jpg

再次编译，并查看其信息：

 lipo -info /Users/admin/Library/Developer/Xcode/DerivedData/LYKitDemo-anioropnglgdfcdumxqlsqwhnusk/Build/Products/Release-iphonesimulator/LYKitDemo.framework/LYKitDemo
Architectures in the fat file: /Users/admin/Library/Developer/Xcode/DerivedData/LYKitDemo-anioropnglgdfcdumxqlsqwhnusk/Build/Products/Release-iphonesimulator/LYKitDemo.framework/LYKitDemo are: i386 x86_64

这样模拟器下的静态库只有 i386 和 x86_64架构，我们再次将模拟器和真机下的静态库进行合并：

lipo -create "/Users/admin/Library/Developer/Xcode/DerivedData/LYKitDemo-anioropnglgdfcdumxqlsqwhnusk/Build/Products/Release-iphoneos/LYKitDemo.framework/LYKitDemo" "/Users/admin/Library/Developer/Xcode/DerivedData/LYKitDemo-anioropnglgdfcdumxqlsqwhnusk/Build/Products/Release-iphonesimulator/LYKitDemo.framework/LYKitDemo" -output "/Users/admin/Desktop/IPA包/LYKitDemo"

这样我们能合并成功
查看新的静态库的信息

 admin@localhost  ~/Desktop  lipo -info /Users/admin/Desktop/IPA包/LYKitDemo
Architectures in the fat file: /Users/admin/Desktop/IPA包/LYKitDemo are: armv7 i386 x86_64 arm64

8，使用 Run Script 合并完整的静态库信息
8.1 在 Build Setting中新增 RunScript 选项

新增runScript选项.png

并将以下脚本信息写入

if [ "${ACTION}" = "build" ]
then
INSTALL_DIR=${SRCROOT}/Products/${PROJECT_NAME}.framework

DEVICE_DIR=${BUILD_ROOT}/${CONFIGURATION}-iphoneos/${PROJECT_NAME}.framework

SIMULATOR_DIR=${BUILD_ROOT}/${CONFIGURATION}-iphonesimulator/${PROJECT_NAME}.framework


if [ -d "${INSTALL_DIR}" ]
then
rm -rf "${INSTALL_DIR}"
fi

mkdir -p "${INSTALL_DIR}"

cp -R "${DEVICE_DIR}/" "${INSTALL_DIR}/"
#ditto "${DEVICE_DIR}/Headers" "${INSTALL_DIR}/Headers"

lipo -create "${DEVICE_DIR}/${PROJECT_NAME}" "${SIMULATOR_DIR}/${PROJECT_NAME}" -output "${INSTALL_DIR}/${PROJECT_NAME}"

#open "${DEVICE_DIR}"
open "${SRCROOT}/Products"
fi

编译工程，就会得到合并后的静态库同时支持 模拟器和真机的静态库。

脚本编译后的静态库.png

9，将x86架构下的swiftModule拷贝至 modules文件中。
modules的文件结构如下：

modules结构.jpg

常见错误

dyld: Library not loaded: @rpath/LYKitDemo.framework/LYKitDemo
Referenced from: /Users/admin/Library/Developer/CoreSimulator/Devices/39CF7B52-BCEE-4BB2-AF78-CCB581E06F91/data/Containers/Bundle/Application/CB27BBCF-D80B-44A9-A88D-7116E18C7CA9/LYCalculatorTest.app/LYCalculatorTest
Reason: image not found

需要将静态库由Do Not Embed 变为 Embed & Sign

have the same architectures (arm64) and can't be in the same fat output file

两个静态库包含了同一种架构，需要去除一个

Could not find module 'LYKitDemo' for target 'x86_64-apple-ios-simulator'; found: arm64, armv7-apple

这是因为静态库中，没有 x86的 swiftmodule文件。我们使用命令合并完两个静态库后，需要手动将 swiftmodule文件合并到一起。

最后附上本文相关Demo: LYKitDemo :静态库工程，LYCalculatorTest：静态库使用工程。