cocoapods导入第三方找不到

[!] CocoaPods could not find compatible versions for pod "Masonry": In snapshot (Podfile.lock): Masonry (= 1.1.0, ~> 1.1.0) In Podfile: Masonry (~> 1.1.0) None of your spec sources contain a spec satisfying the dependencies:Masonry (~> 1.1.0), Masonry (= 1.1.0, ~> 1.1.0). You have either: * out-of-date source repos which you can update withpod repo updateor withpod install --repo-update. * mistyped the name or version. * not added the source repo that hosts the Podspec to your Podfile. Note: as of CocoaPods 1.0,pod repo updatedoes not happen onpod installby default.

网上下载的demo，尝试更新导入的第三方库，报错信息如上

解决方法：根据提示：not added the source repo that hosts the Podspec to your Podfile，在pod文件中添加source来源，
source 'https://github.com/CocoaPods/Specs.git'（添加位置如下）

添加cocoapods库文件地址

再次进行pod install，正常引入第三方库文件