pod install后出现的错误

[!] Your Podfile has had smart quotes sanitised. To avoid issues in the future, you should not use TextEdit for editing it. If you are not using TextEdit, you should turn off smart quotes in your editor of choice.

出现这个错误是因为使用文本编辑编辑了Podfile, 解决办法：不要使用文本编辑去编辑Podfile，使用Xcode编辑，或者使用终端敲命令去编辑。

[!] The `ChatDemo [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

- Use the `$(inherited)` flag, or

- Remove the build settings from the target.

[!] The `ChatDemo [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

- Use the `$(inherited)` flag, or

- Remove the build settings from the target.

上面两个错误的两种解决方法:

1.点击项目文件 project.xcodeproj，右键`显示包内容`，用文本编辑器打开`project.pbxproj`，删除`OTHER_LDFLAGS`的地方，保存，回到 Xcode，编译通过

2.Go to your target Build Settings -> Other linker flags -> double click . Add $(inherited) to a new line.

[!] Pods written in Swift can only be integrated as frameworks; add `use_frameworks!` to your Podfile or target to opt into using it. The Swift Pod being used is: NVActivityIndicatorView

出现这种错误, 是因为Podfile中, platform后的iOS版本低于框架所要求的版本