错误信息如下：

[!] Error installing libwebp
[!] /usr/bin/git clone https://chromium.googlesource.com/webm/libwebp /var/folders/yn/3v64_yzx72b0s88w9mx4l7yw0000gn/T/d20200329-51913-egoz06 --template= --single-branch --depth 1 --branch v1.1.0

Cloning into '/var/folders/yn/3v64_yzx72b0s88w9mx4l7yw0000gn/T/d20200329-51913-egoz06'...
fatal: unable to access 'https://chromium.googlesource.com/webm/libwebp/': Failed to connect to chromium.googlesource.com port 443: Operation timed out

解决方法：

1、终端执行 pod repo 查看 cocoapods 在本机的PATH

master
- Type: git (master)
- URL:  https://github.com/CocoaPods/Specs.git
- Path: /Users/huipeng/.cocoapods/repos/master

trunk
- Type: CDN
- URL:  https://cdn.cocoapods.org/
- Path: /Users/huipeng/.cocoapods/repos/trunk

2、在本地库中, 并找到对应的 libwebp版本 的文件
在 Cocoapods V1.8.0+ 中执行以下命令：

find ~/.cocoapods/repos/trunk -iname libwebp

• 得到路径：
  /Users/huipeng/.cocoapods/repos/trunk/Specs/1/9/2/libwebp

• 进入libwebp目录

  cd ~/.cocoapods/repos/trunk/Specs/1/9/2/libwebp
  

• 查看仓库中有哪些对应的版本

  ls -l
  

  total 0
  drwxr-xr-x  4 huipeng  staff  128 Mar 29 20:48 0.4.1
  drwxr-xr-x  4 huipeng  staff  128 Mar 29 20:48 0.4.2
  drwxr-xr-x  4 huipeng  staff  128 Mar 29 20:48 0.4.3
  drwxr-xr-x  4 huipeng  staff  128 Mar 29 20:48 0.4.4
  drwxr-xr-x  4 huipeng  staff  128 Mar 29 20:48 0.5.0
  drwxr-xr-x  4 huipeng  staff  128 Mar 29 20:48 0.5.1
  drwxr-xr-x  4 huipeng  staff  128 Mar 29 20:48 0.5.2
  drwxr-xr-x  4 huipeng  staff  128 Mar 29 20:48 0.6.0
  drwxr-xr-x  4 huipeng  staff  128 Mar 29 20:48 0.6.1
  drwxr-xr-x  4 huipeng  staff  128 Mar 29 20:48 1.0.0
  drwxr-xr-x  4 huipeng  staff  128 Mar 29 20:48 1.0.1
  drwxr-xr-x  4 huipeng  staff  128 Mar 29 20:48 1.0.2
  drwxr-xr-x  4 huipeng  staff  128 Mar 29 20:48 1.0.3
  drwxr-xr-x  4 huipeng  staff  128 Mar 29 21:12 1.1.0
  drwxr-xr-x  4 huipeng  staff  128 Mar 29 20:48 1.1.0-rc2
  

• 根据错误信息，找到对应的版本(此处是 V1.1.0)，打开文件 libwebp.podspec.json

  "source": {
      "git": "https://chromium.googlesource.com/webm/libwebp",
      "tag": "v1.1.0"
    },
  

• 将 "git": "https://chromium.googlesource.com/webm/libwebp", 改成如下地址：

  "git": "https://github.com/webmproject/libwebp.git",
  

• 保存后，再执行 pod update