第一步:sudo rm -fr ~/.cocoapods/repos/master
第二步:git clone https://git.coding.net/CocoaPods/Specs.git ~/.cocoapods/repos/master
第三步:pod repo update
第一步:sudo rm -fr ~/.cocoapods/repos/master
第二步:git clone https://git.coding.net/CocoaPods/Specs.git ~/.cocoapods/repos/master
第三步:pod repo update