在项目中有时候会遇到Library not found for -lPods(这里的IPods指的是你具体的第三方库)的问题
出现这个错误的原因是:xcode在编译的时候找不到这个库，从而导致项目无法编译！
这里给出几种解决办法：
第一种：
Search from 'Library' from the Target Settings view and double-click to inspect the value of Library Search Paths
There are two values listed $(inherited) and $(PROJECT_DIR)/Pods/build/Debug-iphoneos. Delete the latter.
Do a full clean, build & run
Run pod install again. Notice that the entry is not restored.
第二种：
Go to Product > Edit Scheme
Click on Build
Add the Pods static library, and make sure it's at the top of the list
Clean and build again
第三种：
If that doesn't work, verify that the source for the spec you are trying to include has been pulled from github. Do this by looking in /Pods/. If it is empty (it should not be), verify that the ~/.cocoapods/master//.podspec has the correct git hub url in it.
第四种：
If still doesn't work, check your XCode build locations settings. Go to Preferences -> Locations -> Derived Data -> Advanced and set build location to "Relative to Workspace".
第五种：（网上较为常用的解决办法）
获取 库文件所在的那个文件夹 路径，添加到 Target的Build Settings界面
找到library search paths，然后进行添加！
第六种：（感觉较为无奈的办法）
重新使用pod update 方法更新所有的第三方(反正我没成功，不过网上有人成功过)
第七种：
I've found that $(inherited) was missing from my Other Linker Flags build setting.
Applying this option fixed a missing library issue I was seeing.
