转载自：
https://www.jianshu.com/p/0e3421961db4
执行完pod install之后，控制台抛出以下警告信息：
[!] The use of implicit sources has been deprecated. To continue using all of the sources currently on your machine, add the following to the top of your Podfile:
source 'https://github.com/CocoaPods/Specs.git'
[!] The `ProjectName [Debug]` target overrides the `OTHER_LDFLAGS` build setting defined in `Pods/Target Support Files/Pods/Pods.debug.xcconfig'. This can lead to problems with the CocoaPods installation
[!] The `ProjectName [Release]` target overrides the `OTHER_LDFLAGS` build setting defined in `Pods/Target Support Files/Pods/Pods.release.xcconfig'. This can lead to problems with the CocoaPods installation
.debug.xcconfig丢失
如果不解决此问题的话，会出现由于部分库文件找不到而导致的种种问题：
（1）编译失败，抛出Undefined symbols for architecture i386错误
（2）调用库中的方法，抛出unrecognized selector sent to instance错误
?
解决方法如下：
1、打开工程所在文件夹，找到.xcodeproj文件，右键选择【显示包内容】，找到project.pbxproj文件
2、打开project.pbxproj文件，查找OTHER_LDFLAGS，把和这个相关的内容都删除
3、重新执行pod install，此时应该就没有上面出现的警告信息了
4、编译并运行
问题二:
3、
$ pod setup
Setting up CocoaPods master repo
[!] /usr/bin/git clonehttps://github.com/CocoaPods/Specs.git master
Cloning into ‘master’…
error: RPC failed; curl56 SSLRead()return error -9806
fatal: The remote end hung up unexpectedly
fatal: early EOF
fatal: index-pack failed
4、
$ pod setup
Setting up CocoaPods master repo
[!] /usr/bin/git clonehttps://github.com/CocoaPods/Specs.git master
Cloning into ‘master’…
error: RPC failed; curl18 transfer closed with outstanding read data remaining
fatal: The remote end hung up unexpectedly
fatal: early EOF
fatal: index-pack failed
解决方法：上面错误主要是os10.11+和cocoapods1.0+版本升级的安全机制更改造成的。主要出现在pod setup过程中。且该过程等待时间非常长，所以，你可以在$sudo gem install -n /usr/local/bin cocoapods命令后直接执行$Git clone https://git.coding.net/CocoaPods/Specs.git ~/.cocoapods/repos/master 该过程作用与 pod setup作用相同，作者亲测。效果极佳！！！！
如果还不成功！！！！可以同样的方法安装正式版v0.39 然后在升级到v1.0版本
gem update --system
sudo geminstall -n /usr/local/bin cocoapods--pre