Flutter 更新 1.7.8版本注意事項(xiàng)
cocoapods版本最好是1.6.0版本 （最新版本1.7.4不適用）
如果cocapods版本有問題 需要上級或降級到1.6.0
操作步驟：
一、移除pod組件
1财破、查看CocoaPods組件安裝位置：
$ which pod
結(jié)果：
/usr/bin/pod
2述寡、手動(dòng)移除這個(gè)組件：
$ sudo rm -rf /usr/bin/pod
二榄檬、移除RubyGems中的CocoaPods程序包
1陨瘩、查看gems中本地程序包
$ gem list
結(jié)果：
*** LOCAL GEMS ***
actioncable (5.2.1)
actionmailer (5.2.1)
actionpack (5.2.1)
actionview (5.2.1)
activejob (5.2.1)
activemodel (5.2.1)
activerecord (5.2.1)
activestorage (5.2.1)
activesupport (5.2.1, 4.2.10)
arel (9.0.0)
atomos (0.1.3)
bigdecimal (default: 1.2.8)
builder (3.2.3)
bundler (1.16.4)
bundler-unload (1.0.2)
CFPropertyList (3.0.0)
claide (1.0.2)
cocoapods (1.5.3)
cocoapods-core (1.5.3)
cocoapods-deintegrate (1.0.2)
cocoapods-downloader (1.2.1)
cocoapods-plugins (1.0.0)
cocoapods-search (1.0.0)
cocoapods-stats (1.0.0)
cocoapods-trunk (1.3.1)
cocoapods-try (1.1.0)
colored2 (3.1.2)
concurrent-ruby (1.0.5)
crass (1.0.4)
did_you_mean (1.0.0)
erubi (1.7.1)
escape (0.0.4)
executable-hooks (1.5.0)
fourflusher (2.0.1)
fuzzy_match (2.0.4)
gem-wrappers (1.3.2)
gh_inspector (1.1.3)
globalid (0.4.1)
i18n (0.9.5)
io-console (default: 0.4.5)
json (default: 1.8.3)
loofah (2.2.2)
mail (2.7.0)
marcel (0.3.2)
method_source (0.9.0)
mimemagic (0.3.2)
mini_mime (1.0.1)
mini_portile2 (2.3.0)
minitest (5.8.3)
molinillo (0.6.6)
nanaimo (0.2.6)
nap (1.1.0)
net-telnet (0.1.1)
netrc (0.11.0)
nio4r (2.3.1)
nokogiri (1.8.4)
power_assert (0.2.6)
psych (default: 2.0.17)
rack (2.0.5)
rack-test (1.1.0)
rails (5.2.1)
rails-dom-testing (2.0.3)
rails-html-sanitizer (1.0.4)
railties (5.2.1)
rake (10.4.2)
rdoc (default: 4.2.1)
ruby-macho (1.2.0)
rubygems-bundler (1.4.5)
rvm (1.11.3.9)
sprockets (3.7.2)
sprockets-rails (3.2.1)
test-unit (3.1.5)
thor (0.20.0)
thread_safe (0.3.6)
tzinfo (1.2.5)
websocket-driver (0.7.0)
websocket-extensions (0.1.3)
xcodeproj (1.6.0)
可以發(fā)現(xiàn)當(dāng)前CocoaPods的版本號是1.5.3
2、移除程序包
有了版本號住诸，就可以根據(jù)當(dāng)前版本號移除CocoaPods了：
$ sudo gem uninstall cocoapods -v 1.5.3
結(jié)果：
Successfully uninstalled cocoapods-1.5.3
3暑脆、安裝指定版本的CocoaPods
$ sudo gem install cocoapods -v 1.6.0
結(jié)果：
Successfully installed cocoapods-1.6.0
4、運(yùn)行flutter 查詢結(jié)果
flutter doctor
