著作权归作者所有. 商业转载请联系作者获得授权,非商业转载请注明出处. 作者:黄兢成 链接:http://www.zhihu.com/question/36448325/answer/68614858 来源:知乎 if let 和 guard 只是语法糖,没有也可以,但有了可以使得代码更简洁方便.要理解 if let 和 guard,不妨设想假如没有这两者,代码会怎么写. ------------------------------------ if let func doSomething(s…
gRPC is an universal remote procedure call framework developed by Google that has been gaining interests among many software developers that were developing microservices in recent years because its open source, language neutral, compact binary size,…
ios swift 实现饼状图进度条 // // ProgressControl.swift // L02MyProgressControl // // Created by plter on 7/29/14. // Copyright (c) 2014 jikexueyuan. All rights reserved. // import UIKit class ProgressControl: UIView { override init(frame: CGRect) { super.ini…