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https://medium.com/ios-os-x-development/introduction-to-closures-in-swift-3-1d46dfaf8a20#.vfjwjho80
您即将离开知乎,请注意您的帐号和财产安全。
https://medium.com/ios-os-x-development/introduction-to-closures-in-swift-3-1d46dfaf8a20#.vfjwjho80