一、 library not found for -lXXX

描述: Xcode 10 以后报错library not found for -lstdc++.6.0.9
原因: 这个错误原因是因为iOS12.0中去掉了lstdc++.6.0.9.tbd动态库

解决方案:从Xcode9中找到动态库lstdc++.6.0.9.tbd文件copy到Xcode10下就可以完美解决问题。或者用古老的办法将iOS12的DeviceSupport文件copy到Xcode9.4下也可以完美解决Xcode9运行iOS12的问题。

实际操作

从Xcode9中找到动态库lstdc++.6.0.9.tbd；
需要将文件复制到下述四个路径下，才能保证模拟器和真机均好用

真机加这个就够了
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/lib/
复制代码

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/Library/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/lib/

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/usr/lib/
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二、iPhone is busy: Preparing debugger support for iPhone

描述: 手机第一次链接到Xcode时出现
原因: 需要识别手机

解决方案:等10－15分钟。安心等待是最好的方法

三、Expected a type

描述: 写一个自定义的类，这个类继承了NSObject，其中UIView 报错 Expected a type
原因: 只导入了#import <Foundation/Foundation.h>

解决方案:导入#import <UIKit/UIKit.h>

三、#<CmdSpec::NonZeroExcitException: Command exited with pid 22735 exit 1:

描述: 打测试包时报错

ipatool failed with an exception: #<CmdSpec::NonZeroExcitException: Command exited with pid 22735 exit 1:

/Applications/Xcode.app/Contents/Developer/usr/bin/bitcode-build-tool -v -t
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin -L /var/folders/n0/
d8w9b9k10w368p0qswx479040000gn/T/ipatool20181214-19928-17ts59s/thinned-out/armv7/Payload/schoolBus.app/Frameworks/AFNetworking.framework -L /var/folders/n0/
d8w9b9k10w368p0qswx479040000gn/T/ipatool20181214-19928-17ts59s/thinned-out/armv7/Payload/schoolBus.app/Frameworks/IQKeyboardManager.framework -L /var/folders/n0/
d8w9b9k10w368p0qswx479040000gn/T/ipatool20181214-19928-17ts59s/thinned-out/armv7/Payload/schoolBus.app/Frameworks/MBProgressHUD.framework -L /var/folders/n0/
d8w9b9k10w368p0qswx479040000gn/T/ipatool20181214-19928-17ts59s/thinned-out/armv7/Payload/schoolBus.app/Frameworks/MJExtension.framework -L /var/folders/n0/
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解决方案:如下图箭头所指的这一项不要选

image